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Intel MD566X Modem User Manual

1. E gt in its place The modem buffers up to 512 bytes of fax data received from the remote modem if the DTE cannot read the data immediately AT FRM command For the AT FTH and AT FRH commands data is sent and received using HDLC formatting The format for HDLC framing is provided below When sending the HDLC data the modem automatically generates the flags and the frame checking sequence Frame Check Sum All the other fields are transmitted to or received from the DTE that is these fields are under the control of the DTE z FI Address Control ag ag Field Fiel i es Field Facsimile Control Facsimile Information Field Frame Checking Sequence FCS 74 Figure 5 1 T 30 HDLC Frame Format Intel Confidential Programmer s Guide Note 56K V 92 Data Fax and Voice Chipset After receiving a frame correctly using the AT FRH command FCS is OK the DCE returns an OK message to the DTE If the frame is received in error FCS is not OK carrier is lost or data is lost due to data overflow the DCE returns an ERROR message to the DTE the DTE should then discard the frame If the telephone line is on hook the modem responds back to the DTE with an ERROR message whenever any of the fax AT commands except the FCLASS command are sent to the modem Facsimile Facsimile Control Information Field Field Address Control Field Field Figure 5 2 CLASS 1 DTE Generat
2. Stay Online ATO Server Accepts Request No Returns 0 Yes Returns 1 13 Disconnect Flash Hook PMHF Yes Answer Call End Data Connection ATH Finish Call Flash Hook PMHF lt 4 Go Back Online ATO Programmer s Guide Intel Confidential 31 56K V 92 Data Fax and Voice Chipset in Modem on Hold Initiating a Voice Call in Data Mode Enable MOH PMH 0 Command Mode AT Request to go on hold PMHR Server Accepts Request Yes Returns 1 13 Disconnect Flash Hook PMHF Initiate Call End Data Connection ATH Finish Call Flash Hook PMHF Go Back Online ATO 32 Intel Confidential Programmer s tel Guide a intel A 56K V 92 Data Fax and Voice Chipset To configure the DTE to modem data rate in data on hook command mode change the terminal program COM port speed selection or write the appropriate divisor latch values for a given speed to the UART Divisor Latch registers Then send an AT lt CR gt or any other valid AT command to the modem The modem responds with an OK at the new data rate All commands and modem responses that follow use the new data rate Note In command mode the modem only changes its DTE to modem data rate after the Divisor Latch register values chang
3. 0 parameter only if zero is a valid parameter for the command For example ATZ and ATZ0 commands perform identical functions that is the modem sees ATZ and automatically uses the 0 parameter during processing the command Other commands do not use parameters Programmer s Guide Intel Confidential 7 56K V 92 Data Fax and Voice Chipset In 2 AT COMMAND SUMMARY TABLES tel This section contains summary tables of all AT commands S registers and manufacturing only commands These commands are described fully in the relevant sections of the Programmer s Guide Table 2 1 Data Mode Command Summary Note Command Function Default Range bay by iis A Repeat last command none no A Answer none no Bn Select ITU T or Bell 1 0 3 yes BO Selects ITU T V 22 at 1200 bps and ITU T V 21 at 300 bps Bi Selects Bell 212A at 1200 bps and Bell 103J at 300 bps Selects ITU T V 23 only The originating B2 modem transmits at 75 bps and receives at 1200 bps the answering modem receives at 75 bps and transmits at 1200 bps Selects ITU T V 23 only The originating B3 modem transmits at 1200 bps and receives at 75 bps the answering modem receives at 1200 bps and transmits at 75 bps Cn Carrier control option 1 0 1 no Co Transmit carrier always off C1 Normal transmit carrier D Dial command none 7 no s En Command mode echo 1
4. NCnn 0 n 0 United States n 1 Japan n 2 United Kingdom n 3 Germany n 4 Sweden n 5 Denmark n 6 Finland n 7 Norway n 8 Austria n 9 CTR21 n 10 Russia n 11 Australia n 12 Malaysia Programmer s Guide Intel Confidential 113 a 56K V 92 Data Fax and Voice Chipset x and Voice Chip intel Table 9 1 Manufacturing Only Command Descriptions Continued Set Plug and Play Board Serial Number This command sets the serial number for the plug and play board using four fields or bytes of eight bits each m Byte 3 Byte 2 Byte 1 Byte 0 IP m none Byte 0 255 m 0 255 0 255 0 255 0 255 For example LPS 2507 0 125 2 Data Transmit Level This S register sets the modem s transmit level for the data mode This value is stored in the NVRAM but is not displayed by the amp Vn command The reset commands amp F and Zn have no effect on S91 Since the function of S91 relates to modem hardware this command should only be used by the modem manufacturer and never used by a software developer or end S91 10 user In some countries the end user is not allowed to change the transmit level In these countries the country PTT checks to make sure that the end user can not change the transmit level Range 0 to 15 15 dBm Default 10 10 dBm Fax Transmit Level This S register sets the modem s transmit level for the fax mode This value is stored in the NVRAM but is not displayed by the amp V command The reset
5. Bit 4 Clear To Send CTS When this bit is set to 1 it indicates to the DTE that the modem is ready to receive data Bit 3 Delta Data Carrier Detect DDCDD When this bit is set to 1 it indicates that the DCD bit has changed its value since the DTE last read the MSR register Bit 2 Trailing Edge of Ring Indicator TERI This bit is set to 1 after the RI signal goes from a high to low state Bit 1 Delta Data Set Ready DDSR When this bit is set to 1 it indicates that the DSR bit has changed its value since the DTE last read the MSR register Bit 0 Delta Clear to Send DCTS When this bit is set to 1 it indicates that the CTS bit has changed its value since the DTE last read the MSR register 10 1 3 Line Status Register LSR This read only register provides UART status information to the host Bits 4 1 report error conditions These bits are reset to 0 any time the host reads this register An interrupt is generated to the host whenever any one of the bits 4 1 is set to 1 and the RLSIE receiver line status interrupt has been enabled Bits 0 5 and 6 provide status information for sending and receiving data through the THR Transmit Holding register and the RBR Receiver Buffer register Bits 0 5 6 are reset to 1 only when the host performs a specified action Programmer s Guide Intel Confidential 121 a 56K V 92 Data Fax and Voice Chipset intel In F
6. 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 and 33 600 bps 56 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued MS m see m cont Modulation Selection cont V90 56 kbps V 90 asymmetrical connections transmit 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 bps and 33 600 bps 56 kbps V 90 asymmetrical connections receive 28 000 29 333 30 666 32 000 33 333 34 666 36 000 37 333 38 666 40 000 41 333 42 666 44 000 45 333 46 666 48 000 49 333 50 666 52 000 53 333 54 666 and 56 000 bps V92 56 kbps V 92 asymmetrical connections transmit 24 000 25 333 26 666 28 000 29 333 30 666 32 000 33 333 34 666 36 000 37 333 38 666 40 000 41 333 42 666 44 000 45 333 46 666 48 000 bps 56 kbps V 92 asymmetrical connections receive 28 000 29 333 30 666 32 000 33 333 34 666 36 000 37 333 38 666 40 000 41 333 42 666 44 000 45 333 46 666 48 000 49 333 50 666 52 000 53 333 54 666 and 56 000 bps lt automode gt When enabled this parameter allows the modem to negotiate modu lation speeds automatically if an automatic value is defined for that particular mod ulation This feature is also controlled by the Nn AT command The automode set ting is based on which command Nn or MS m was issued last Ra
7. Modem Dat i Status Caner Ring Data Edge of register Detect Indicator Carrier Ring A DCD RI Detect Indicator ak DDCDD TERI tj r i Transmitter ine rror in Transmitter Holding Break Framing Parity Overrun RCVR Ee D Empty Ege Interrupt Error Error Error mpty BI FE PE E LSR Note 1 TEMT THRE BI FE PE OE Modem Request Control to Terminal register Send Ready MCR RTS DTR Line Divisor Even Number Latch Parity Control Access Stick Parity Enable ot register bit Parity Select PEN Stop bits TB LCR DLAB SPAR EPS STB FIFO Control RCVR RCVR muse RCVR FIFO FIFO FIFO Enable register Trigger Trigger Reserved Reserved Reserved Reset Reset FIFOE write only XFIFOR RFIFOR Interrupt Identity Interrupt register Enabled Enabled ID Interrupt read only Note 1 Note 1 i bit 1 i pending IIR Receiver Transmitter i merepi Line Status Holding Reg ee register Interrupt Interrupt Empty Available IER Enable Enable Int Enable Int Enable MSIE RLSIE THREIE RDAIE Transmit Holding register Transmit Holding register THR Write only write only Receiver Buffer register Receiver Buffer register RBR Read only read only RBR Divisor Latch ce MS D Latch DLM MS S Divisor Latch DLM Divisor Latch LS DLL LS Divisor Latch DLL Note These bits are always 0 in 16C450 mode 120 Intel Confid
8. SO No of rings to auto answer on 0 255 ring yes S1 Ring count 0 255 ring yes i S2 Escape character 43 0 127 ASCII yes S3 Carriage return character 13 0 127 ASCII yes S4 Line feed character 10 0 127 ASCII yes S5 Backspace character 8 0 32 127 ASCII yes gt S6 Wait before dialing 2 2 255 second yes 5 S7 Wait for carrier 60 1 255 second yes S8 Pause time for dial modifier 0 255 second yes bs Sg Carrier recovery time 1 255 0 1 second yes 5 S10 Lost carrier hang up delay 14 1 255 0 1 second yes x S11 DTMF dialing speed 70 50 255 ms yes S12 Guard Time 50 0 255 0 02 second yes f S14 Bit mapped options 138 no S16 Modem test options 0 no 18 Modem test timer 0 0 255 second yes i 21 Bit mapped options 48 no Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 2 9 S Register Summary Continued Note Register Function Default Range Units paps 22 Bit mapped options 118 no 23 Bit mapped options none no 7 25 Detect DTR change 5 0 255 0 01 second yes id S27 Bit mapped options 64 7 no 30 Disconnect inactivity timer 0 0 255 minute yes 31 Bit mapped options 49 no 33 Sleep mode timer 10 0 90 second yes i S37 Maximum line speed attempted 0 0 35 yes Note The manufacturing only S registers S91 and S92 are listed in the Manufacturing Only Commands Programmer s Guide
9. this bit indicates that the DTE is read to establish a communi cation link 10 1 5 Line Control Register LCR Registera pias serk SPAR wisi wiso This register specifies the asynchronous data communication exchange format The modem supports up to 10 bit data characters 1 start bit of data character bits parity of stop bits Divisor Latch Access Bit DLAB This bit must be set to 1 to access the divisor latches of the baud rate Bit 7 generator during a read or write operation The UART registers 1 and 0 are used for the divisor latches This bit must be set to 0 to access the Receiver Buffer register RBR the THR Transmitter Holding register or the IER Interrupt Enable register SBRK Set Break This bit is used to send a long space disconnect message to the remote modem The procedure is as follows 1 After the THRE bit has been set to 1 by the DCE and before setting the SBRK bit the DTE needs to write Bit 6 a NULL 00h character to the THR 2 The DTE then sets the SBRK bit after the next time the THRE bit is set by the DCE a long space is now being transmitted 3 To return to normal transmission mode wait for the TEMT to be equal to 1 then reset the SBRK bit SPAR Stick Parity When this bit is set to 1 stick parity is enabled When configured for stick parity Bit 5 SPAR 1 even parity EPS 1 with parity enable PEN 1 then the parity b
10. 0 1 yes EO Disables echo E1 Enables echo Fn Online echo 1 0 1 no FO Enables online echo F1 Disables online echo Hn Switch hook control 0 0 1 no HO Hangs up the telephone line H1 Picks up the telephone line In Identification checksum option 0 eee no 10 Reports product code l1 Reports modem chip firmware version 12 Verifies ROM checksum I3 Reports chipset name Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 2 1 Data Mode Command Summary Continued Note Command Function Default Range ARa s by 14 Reserved I5 Reserved for modem chip hardware configu ration I6 Country code I7 Version of board manufacturer firmware 18 Modem firmware features 110 Modem board configuration bits set by board manufacturer i11 Modem board configuration bits set by board manufacturer 112 Reserved 113 Reserved 114 SAFE device 120 Intel silicon version 121 Intel firmware version 122 Intel manufacturer name 123 Intel product model 5 Ln Speaker volume control 1 0 3 yes LO Low speaker volume L1 Low speaker volume L2 Medium speaker volume L3 High speaker volume 3 Mn Speaker control 1 0 3 yes MO Speaker always off M1 Speaker on until carrier present M2 Speaker always on M3 Speaker off during dialing speaker on until carrier present A Nn Select data rate handshak
11. 2 Ignore V 92 call waiting Modem on Hold Enable This command controls whether or not modem on hold procedures are enabled during V 92 operation PMH m 0 m 0 Enables V 92 modem on hold m 1 Disables V 92 modem on hold Modem on Hold Timer This command controls whether or not the modem will grant or deny a Modem on hold MOH request as well as setting the Modem on Hold Timeout m 0 Deny V 92 Modem on hold Request m 1 Grant MOH with 10 second timeout m 2 Grant MOH with 20 second timeout m 3 Grant MOH with 30 second timeout m 4 Grant MOH with 40 second timeout PMHT m none m 5 Grant MOH with 1 minute timeout m 6 Grant MOH with 2 minute timeout m 7 Grant MOH with 3 minute timeout m 8 Grant MOH with 4 minute timeout m 9 Grant MOH with 6 minute timeout m 10 Grant MOH with 8 minute timeout m 11 Grant MOH with 12 minute timeout m 12 Grant MOH with 16 minute timeout m 13 Grant MOH with indefinite timeout Programmer s Guide Intel Confidential 59 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued Initiate Modem on Hold This command requests the DCE to initiate or to confirm a modem on hold procedure The DCE shall return ERROR if Modem on Hold is not enabled or if the DCE is in an idle condition The DCE shall return the string re sponse PMHR lt value gt where lt value gt is a decimal value corresponding to the Modem on Hold timer value received or the request sta
12. 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued VBT m see m Buffer Threshold Setting This command specifies the flow control assert and deassert points inside the DCE s internal transmit buffer The internal buffer is 512 bytes The VBT m parameters are fixed in firmware and cannot be changed m lt deassert gt lt assert gt Defaults lt deassert gt 192 lt assert gt 320 lt assert gt This parameter stops data transfer from the DTE when the number of bytes in the buffer reaches the lower number of the range specified by the lt as sert gt parameter So that no data is lost before the modem stops the flow of data the lt assert gt parameter allows more data to enter the buffer until it reaches the larger number in its range Range lt assert gt 192 lt deassert gt This parameter starts data transfer from the DTE after the number of bytes in the transmit buffer falls below the lt deassert gt value Range lt deassert gt 320 VCID n 0 Caller ID Selection This command controls the reporting and presentation of data in the ICLID Incoming Call Line ID data format used by the Caller ID ser vices in the United States and Canada At a minimum the data sent to the DCE includes the date time and the caller s telephone number Caller ID information is sent to the DTE during the first and second ring signals when the modem is in voice data or
13. C BB860980 BFE63883 BB863EE0 84 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued Event Reporting and Masking cont Hex Digit Event ex gi Number Event Description DCE Voice Mode s Location Bit Number 1 0 Caller ID report Command 1 Reserved 2 Distinctive ringing All 3 RING All 2 4 DTMF received All 5 Receive buffer overrun Receive 6 Fax calling for example All 1100 Hz Data calling for example All 1300 Hz 3 Local phone on off hook All y Presumed hang u A 9 SILENCE timeout Receive A Presumed end of 10 message QUIET timeout Receive and command 11 Reserved 4 12 Reserved 13 Loop current interruption All 14 Loop current polarity All reversal 15 Reserved 5 16 Reserved VEM m see m 17 Reserved cont 18 Ringback remote ring All 19 BUSY reorder fast busy Receive and Command 6 20 DIALTONE Receive and Command 21 Reserved 22 Reserved 23 Transmit buffer under run Transmit 7 24 Extension phone on off All hook A Fax or data answer for 25 example 2100 Hz l Command Data answer for example 26 2225 Hz P e Command 27 Reserved 8 28 Reserved 29 Reserved 30 Reserved 31 Reserved 32 Reserved 33 Reserved 34 Reserved 35 Reserved NOTES All Playback Record and Command modes Items marked with an asterisk meet IS 101 Class C specifications Reserved Reserved event number that sho
14. DD is the day number 01 through 31 All numbers are in ASCII decimal For numbers less than 10 a filling ASCII zero is used TIME TIME HHMM where HH is the hour number 00 through 23 and MM is the minute number 00 through 59 All numbers are in ASCII decimal format For numbers less than 10 a filling ASCII zero is used NMBR lt number gt or P or O ASCII 4Fh where lt number gt is the telephone number of the caller where P NMBR indicates that the calling number information is not available since the originating caller has requested pri vate service and where O indicates that the calling number information is not available since the out of area code or the service is unavailable NAME NAME lt listing name gt where lt listing name gt is the subscription listing name MESG MESG lt data tag gt lt length of message gt lt data gt lt checksum gt in printable ASCII to avoid possible prob lems with binary output numbers If a data tag is unrecognizable the DCE presents the given data item s information using the MESG tag The DCE follows the conventions of the unformatted reporting form defined below where applicable for the given data item only Programmer s Guide Intel Confidential 111 a 56K V 92 Data Fax and Voice Chipset intel 112 Example 1 The following example of formatted form report AT VCID 1 illustrates the case when the DCE does not recognize the tag of one given data item fr
15. DTE Ifthe DTE transmits no additional data within 5 seconds from when the modem reported the CONNECT result code the modem turns off the transmit carrier mode returns to command mode and sends the ERROR result code to the DTE In HDLC transmit mode the modem performs HDLC transparency functions FCS generation and buffers the transmit data The modem uses the configured meth od of flow control to pause the DTE as necessary Note If the modem is on hook it always returns an ERROR message to the DTE after receiving the FTH lt mod gt command Range lt mod gt 3 Refer to Table 5 2 on page 74 78 Intel Confidential Programmer s Guide intel Table 5 3 Note Command 56K V 92 Data Fax and Voice Chipset Fax Mode Command Descriptions Continued An asterisk denotes the factory default setting Default Description FTM n none Transmit Data The FTM lt mod gt command causes the modem to transmit data using the modulation selected in lt mod gt The modem returns a CONNECT result code and transmits the proper training sequence in the selected mode followed by constant 1 bits until data is received from the DTE The modem terminates this command upon detecting lt DLE gt lt ETX gt characters in the data stream If the modem s transmit buffer empties and the last transmitted character is an ASCII NULL 00 the modem continu
16. Dial Modifiers 0 9 A B C D P R lt space gt Dialing Digits Tone Dial Characters Pulse Dial configures the modem to use pulse dialing to dial a telephone number Reverse Originate Mode places the modem in answer mode This modifier should be the last character in the dial ing string for example ATDT 12345678R After dialing the telephone number the modem goes into data modem an swer mode instead of originate mode Dial NVRAM Telephone Number causes the modem to dial a telephone number previously stored in the NVRAM with the AT amp Zn x command Tone Dial configures the modem to use DTMF tones to dial a telephone number Wait for Dial Tone causes the modem to look for dial tone for a specified amount of time If dial tone or the amount of time specified by the S register S6 times out the modem processes the next command in the dial string If a busy sig nal is detected the modem responds to the DTE with a busy response code and then goes into off line command mode Pause causes the modem to pause or delay implementing the next parameter in the dial string by the time specified in S register S8 Flash Hook causes the modem to go on hook for 0 75 sec onds Wait for Quiet Answer causes the modem to wait for spec ified amount of time S register S7 followed by 5 seconds of silence before processing the next dial modifier Return to Idle State causes the modem to enter onli
17. Enables V 42 bis only when transmitting data H2 Enables V 42 bis only when receiving data H3 Enables V 42 bis for both transmitting and receiving data On V 42 bis string length 32 6 250 yes 3 0 0 471 942 D844 m V 44 data compression 140 140 See note no 1884 3768 a See the DS44 m description in Table 3 4 for a full command description of parameter ranges Programmer s Guide Intel Confidential 15 56K V 92 Data Fax and Voice Chipset Value saved in NVRAM Intel Confidential Programmer s Guide ntel 56K V 92 Data Fax and Voice Chipset Table 2 3 Fax Identity Command Summary 2 Reported Command Function Default Range by amp Vn FMDL Identifies product model none no FMFR Identifies modem manufacturer none no FMI Identifies modem manufacturer none no FMM Identifies product model none no FMR ee product version num Aone _ na FREV ee product version num Aen 2 ao Table 2 4 Fax Class 1 Command Summary Reported Command Function Default Range by amp Vn FCLASS 1 Mode selection 0 0 1 8 no FRH n Receive HDLC data none 3 no FRM n 24 48 72 73 74 96 97 Receive data none 98 121 122 145 146 no FRS n Wait for silence none 1 255 no FTH n Transmit HDLC data none 3 no FTM n 24 48 72 73 74 96 97 Transmit data none 98 121 122 145 146 no FTS n Stop transmission an
18. FIFO is empty This bit is then reset to 0 when at least one byte is written to the XMIT FIFO BI Break Interrupt This bit is set to 1 whenever the received data are spaces logic 0 for at least 2M 3 bits M start bit of data character bits parity bit of stop bits This bit is reset to O whenever the host reads the LSR register The modem waits for the valid start bit before again transferring data to the FIFO When a break occurs in FIFO mode a single null character is placed in the RVCR FIFO The BI bit is then set when the zero character gets to the top of the FIFO stack Bit 5 Bit 4 FE Framing Error This bit is set to 1 whenever a valid stop bit logic 1 has not been detected after the last data bit or parity bit This bit is reset to O whenever the host reads the LSR register The UART tries to Bit 3 resynchronize after a framing error In FIFO mode the modem FE bit is set to 1 whenever the associated framing error character has reached the top of the stack PE Parity Error This bit is set to 1 whenever the received data character does not have the correct even or odd parity as selected by the EPS even parity select bit LCR4 and the stick parity bit LCR 5 This bit Bit 2 is reset to O whenever the host reads the LSR register In FIFO mode the modem PE bit is set to 1 whenever the associated framing error character has reached the top of
19. Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued Compression Method Selection cont Transmission Range n 0 n 0 Disabled When receiving voice this parameter changes the level of noise that the DCE treats as silence A higher n number raises the threshold of noise detection Reception Range n 0 n 0 Disables DCE silence compression n increments of 1 Raises noise detection threshold lt sel gt Silence Expansion This command enables the DTE to modify the amount of silence expansion This parameter represents the maximum period of silence the DCE expands a period of silence compressed by the lt scs gt parame ter The DCE ignores the lt sel gt parameter if lt scs gt is zero lt vsr gt Serial UART lt cml gt Hard Disk Compression Sampling Data Rate Data Rate Bytes sec Note Rate bps bps lt cml gt CL1 4800 48 000 57 600 4800 7200 72 000 115 200 7200 1 8000 80 000 115 200 8000 1 9600 96 000 115 200 9600 1 manufac 11025 110 250 115 200 11 025 1 VSM m cont s ai lt cml gt AD3 4800 18 000 19 200 1800 p 7200 27 000 38 400 2700 8000 30 000 38 400 3000 9600 36 000 38 400 3600 11025 41 344 57 600 4135 lt cml gt AD4 4800 24 000 38 400 2400 7200 36 000 38 400 3600 8000 40 000 57 600 4800 9600 48 000 57 600 4800 11025 55 125 57 600 5513 lt cml gt LIN1 4800 48 000 57 600 4800 7200 72 000 115 200 7200 1 8000 80 00
20. Guide intel 56K V 92 Data Fax and Voice Chipset Table 5 3 Fax Mode Command Descriptions Continued Note An asterisk denotes the factory default setting Command Default Description FRH n cont Receive HDLC Data cont The modem obeys the configured flow control from the DTE If the DTE sends any character to the modem other than DC1 or DC3 while the modem is in this mode the modem enters command mode and return an OK result code After sending the result code indicating that frame reception is complete the mo dem continues to receive and buffer the data in the selected mode If the DTE is sues another FRH lt mod gt command the modem returns another CONNECT result code and continues with HDLC reception If the DTE issues any command that changes modulation the DCE stops the receive process the DCE then dis cards any buffered data and processes the command Range lt mod gt 3 Refer to Table 5 2 on page 74 FRM n none Receive Data The FRM lt mod gt command causes the modem to enter receive mode using the modulation scheme specified in lt mod gt lt mod gt may have the val ues shown in Table 5 2 on page 74 When the selected carrier is detected the modem sends a CONNECT result to the DTE If a different signal is detected the modem sends a FCERROR con nect error result code to the DTE and returns to command mode After receiving the
21. Handshake This command specifies whether the result ing modem to modem modulation can be different from the modulation spec ified in the MS m lt carrier gt parameter N n 0 When originating or answering connect only at the data rates spec n 1 ified by the modulation n 1 When originating or answering begin handshaking at the modula tion data rate If the remote modem does not support the specified modulation data rate fall down in data rate or modulation to the highest compatible data rate Go Online This command causes the modem to return back to online data mode from online command mode On 0 nag Returns the modem to data mode n 1 Begins an equalizer retrain sequence then returns to data mode P Select Pulse Dialing This command configures the modem to use pulse dialing none d next time the modem dials a telephone number Result Code Display Control This command selects whether the modem sends result codes to the DTE Qn 0 n 0 Result codes enabled n 1 Result codes disabled Select an S Register This command selects the current S register Sn none n 0 37 Programmer s Guide Intel Confidential 47 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued Write to an S Register This command writes a decimal number x to S register n Sn x none n 0 37 x 0 255 Read an S Register This command is used to read a decimal number from S
22. LAPM V42B TX 28800 RX 28000 n 4 CONNECT result code reports DCE protocol data compression and DCE data rate when the mode is configured for verbose V1 text response codes For numeric responses VO the modem responds with the WO numeric response codes The verbose response codes use the following format DCE protocol data compression line speed Error correction types include NONE LAPM MNP Data compression types include NONE V42B MNP5 For example PROTOCOL LAPM COMPRESSION V42B CONNECT 33 600 Programmer s Guide Intel Confidential 49 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued Result Code Type Call Progress This command determines which mo dem result codes are enabled Additionally this command specifies whether busy and dial tone detection are enabled or disabled n 0 Result codes 0 4 enabled Busy and dial tone detect disabled n 1 Result codes 0 5 10 and above enabled Busy and dial tone detect Xn disabled n 2 Result codes 0 6 10 and above enabled Busy detect disabled and dial tone detect enabled n 3 Result codes 0 5 7 10 and above enabled Busy detect enabled and dial tone detect disabled n 4 Result codes 0 7 10 and above enabled Busy and dial tone detect enabled Long Space Disconnect This command determines whether the modem disconnects after receiving 1 6 seconds of silence and whether the modem sends a per
23. Selects ITU T V 22 when the modem is at 1200 bps and ITU T V 21 when the modem is at 300 bps n 1 Selects Bell 212A when the modem is at 1200 bps and Bell 103J when the modem is at 300 bps n 2 Selects ITU T V 23 modulation connections only that is the mo Bn 1 dem does not connect for any other speed or modulation The orig inating modem transmits at 75 bps and receives at 1200 bps and the answering modem transmits at 1200 bps and receives at 75 bps n 3 Selects ITU T V 23 modulation connections only that is the mo dem does not connect for any other speed or modulation The orig inating modem transmits at 1200 bps and receives at 75 bps and the answering modem transmits at 75 bps and receives at 1200 bps Carrier Control Option This command is reserved for selecting between controlled carrier or constant carrier modes This modem supports only con Cn 1 stant carrier mode n 0 Transmit carrier always off returns an ERROR message n 1 Normal transmit carrier constant carrier 42 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued D none Programmer s Guide Dial Command This command causes the modem to immediately go off hook as an originating modem and dial a telephone number with correspond ing dial modifiers Dial modifiers are parameters that define how the modem should dial the telephone number
24. after the modem receives the amp Tn command After the testing period elapses the modem halts the test and returns to command mode To abort the test before the test timer has timed out enter the escape code sequence followed by AT amp T 0 Setting S18 to an 0 disables the test timer In this case the loopback test continues to run until an escape code followed by AT amp TO or ATH is sent to the modem The modem provides a local analog loopback test see Section 3 9 1 and local analog loopback self test see Section 3 9 2 for testing modem to modem and DTE to modem communication integrity in all modes except V 90 and V 92 After entering the loopback mode the communication integrity is checked by the DTE sending data to the modem and then checking the looped back data for errors In addition in the self test mode the modem implements an internal data pattern generator and checker that detects errors When a data error occurs in self test mode the modem increments an internal error counter Upon completing the test the modem sends a three digit error count to the DTE These tests are illustrated in the following examples 3 9 1 Local Analog Loopback AT amp T1 This test is used by the local DTE to check the DTE to modem communication integrity The local DTE will not initiate the test from online command mode LOCAL MODEM TAD TRANSMITTER RXD lt RECEIVER Figure 3 2 Local Analog Loopback Test DTE Local Mode
25. amp D2 is selected 11 amp D3 is selected Bit 5 0 amp CO is selected 1 amp C1 is selected Bit 6 0 amp S0 is selected 1 amp S1 is selected Bit 7 0 YO is selected 1 Y1 is selected Bit Mapped Options S22 is a read only register that indicates AT command set tings Bits 1 0 00 LO is selected 01 L1 is selected 10 L2 is selected 11 L3 is selected Bits 3 2 00 MO is selected 01 M1 is selected 10 M2 is selected S22 118 11 M3 is selected Bits 6 4 000 X0 is selected 001 Reserved 010 Reserved 011 Reserved 100 X1 is selected 101 X2 is selected 110 X3 is selected 111 X4 is selected Bit 7 0 amp PO is selected 1 amp P1 is selected Programmer s Guide Intel Confidential 105 56K V 92 Data Fax and Voice Chipset intel Table 7 1 S Register Command Descriptions Continued Bit Mapped Options S23 is a read only register that indicates AT command set tings Bit 0 Bits 3 1 000 23 none 110 Bit 5 4 00 Bit 7 6 00 01 10 11 Reserved 0 300 bps communications rate 1200 bps 2400 bps 4800 bps Reserved 9600 bps 19 200 bps 238 4 bps Even parity space parity No parity Odd parity mark Reserved amp GO is selected amp G1 is selected amp G2 is selected Reserved Detect DTR Change S25 defines the minimum amount of time that DTR has to re main off that is on to off to on transitions before the modem performs the function specified by amp Dn command A change in DTR that p
26. applications software for end users Value saved in NVRAM Note Default values for VGP0 2 n are dependent on board design Programmer s Guide Intel Confidential 23 a 56K V 92 Data Fax and Voice Chipset intel 3 BASIC DATA MODE AT COMMANDS The 56K FastPath chipsets implement Standard TIES compatible AT commands and S registers in data mode e Standard EIA TIA 578 AT commands in Class fax mode Additional AT command sets for error correction data compression and voice mode In data mode the AT commands configure the DCE modem to establish a connection with a remote data modem In data mode the MD566X executes the AT commands for error correction MNP 2 4 V 42 and data compression MNP 5 V 42 bis described in Table 4 2 on page 66 as well as the fax and voice mode commands AT FCLASS 1 fax and AT FCLASS 8 voice 3 1 Using AT Commands to Access the S Registers Sn Sn x The DTE can access the S registers through the ATSn ATSn x and commands For example to configure the modem to automatically answer a data modem call after two rings type ATS0 2 Examples ATS0 2 Configures S register SO to 2 ATS0 Reads the contents of S register SO ATS0 Configures S register SO to 0 AT Reads the contents of the last accessed read or write S register 3 2 Modem Responses and Command Echo En Vn Xn Wn Qn The ATEn command configures the DCE to send back to the DTE any
27. automati cally cleared by the modem FIFOE FIFO Enable This bit when set to 1 enables both the XMIT and RCVR FIFOs This bit must be a Bit O 1 whenever writing to any other FIFO bit If FIFO is not set to 1 then the DTE can not program any of the FIFO functions 124 Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset intel 10 1 7 Interrupt Identity Register IIR FIFO EN FIFO EN le ex VDMA Int ID 2 Int ID 1 Int ID O Register 2 read only This read only register indicates when the transmitter and receiver FIFOs are enabled and the source of highest priority pending interrupt to the DTE Five levels of modem interrupt sources in order of priority are receiver line status received data ready character time out indication transmitter holding register empty and modem status When the DTE reads the IIR the modem freezes all interrupts and indicates the highest priority pending interrupt While the DTE is reading the IIR register the modem records new interrupts but does not change its current indication until the read process is completed Table 10 2 Interrupt Control Functions FIFO Interrupt M Identification 3 ode de cano Interrupt Source and Reset Functions Only Register Bit 3 Bit 2 Bit 1 Bit 0 Priority Interrupt Int Level Interrupt Type Interrupt Source D2 D1 iDO Pend Re
28. break to remote if in reliable mode Kn 5 n 0 1 Destructive expedited n 2 3 Nondestructive expedited n 4 5 Nondestructive non expedited In connect state receives break at serial port if in direct mode n 0 2 4 Immediately sends break and enters command state n 1 3 5 Immediately sends break through In connect state receives break at modem port and sends to serial port n 0 1 Destructive expedited n 2 3 Nondestructive expedited n 4 5 Nondestructive non expedited Set Operating Mode Determines the type of connection attempted by the modem n 0 4 n 0 1 Buffer Normal Mode no data compression or error correction but uses speed buffering n 2 MNP Reliable Mode the modem attempts to negotiate an MNP error correction reliable link hanging up if it fails Nn 3 n 3 V 42 Auto Reliable Mode if V 42 detection is enabled Jn a LAPM or MNP link can be detected and negotiated otherwise only LAPM is attempted If configured for JO and a protocol connection is not made the modem hangs up If configured for J1 and a pro tocol connection is not made the modem falls back to speed buffer ing mode n 4 V 42 Reliable Mode the modem attempts to negotiate LAPM er ror correction hanging up if it fails Originate Reliable Link In buffer normal mode NO or N1 the modem attempts o nne to originate an MNP link regardless of whether the modem originated or answered the telephone call physical connection The re
29. by the VTD n command a Single tones can be sent in brackets using the following format AT VTS lt first tone freq 1 gt VTS m or cont mone AT VTS lt first tone freq 1 gt lt space gt lt duration gt For example AT VTS 3000 This sends a single tone of 3000 Hz with a de fault duration specified by VTD n For example AT VTS 3000 50 This sends a single tone of 3000Hz with a duration of 500ms 50 x 0 01 second b Dual tones may be sent using the following format AT VTS lt first tone freq 1 gt lt second tone freq 2 gt or AT VTS lt first tone freq 1 gt lt second tone freq 2 gt lt duration gt For example AT VTS 3000 3300 This sends a dual tone of 3000 Hz and 3300 Hz with the default duration set by the VTD n command For example AT VTS 3000 3300 50 This sends a dual tone of 3000 Hz and 3300 Hz with a duration of 500 ms 50 x 0 01 second 98 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued VTS m cont nong DTMF and Tone Generation cont c This command can be used to send a period of silence in a tone string Use the following format AT VTS lt duration gt AT VTS For example AT VTS 50 This sends a 500 ms period of silence 3 Single DTMF tones or hookflashes are sent enclosed in braces A duration must be included as the duration set in VTD n
30. can stay on line ATO command issued or disconnect from his initial data connection ATH command issued The next sequence describes how to initiate a voice call while online First enable the MOH feature by setting PMH 0 When online the user can initiate a voice call by first issuing AT to put the modem in command mode Then request the server to go on hold by issuing the PMHR command The server will either accept 1 13 returned or reject 0 returned the request If the server accepts the request to go on hold the modem issues the PMHF to flash the hook and get dial tone You can then make a voice call After completing the voice conversation the modem will issue another PMHF and ATO command to initiate a Quick Connect If the server rejects the request to go on hold the user can stay on line ATO command issued or disconnect from his initial data connection ATH command issued Refer to Table 3 4 for the detailed description of the V 92 commands The PCM Upstream feature allows you to upload data to the network up to 48 000 bps This is an improvement over the 33 600 bps maximum with V 90 This is beneficial when you are sending large file e mail attachments and gaming on the Internet The PIG command is used to enable and disable the PCM Upstream feature To enable PCM Upstream set PIG 0 To disable PCM Upstream set PIG 1 Several V 34 modes are available see Table 3 2 These provide different speeds For example V34B of
31. char2 char3 escape character S2 Example DTE AT lt CR gt DCE OK Note TIES requires that the three character escape sequence be contiguous and not repeated The character immediately preceding the first character of the three character sequence cannot be the same as the escape character Therefore AT lt CR gt is valid but AT lt CR gt is not Table 3 4 Data Mode Command Descriptions Note denotes the factory default setting Command Default Description Repeat Last Command This command re executes the last AT command string stored in the command buffer A is the only command not preceded by AT and end ed by a carriage return Al none Sending any character such as a carriage return after A and before a modem re sponse is sent to the DTE causes the modem to abort the remainder of the com mand string in the modem internal command buffer Answer Command This command causes the modem to immediately go A jon off hook and initiate an answer mode handshake without waiting for an in coming ring signal This command is useful for manually answering a call or establishing a back to back connection with an originate mode modem Programmer s Guide Intel Confidential 41 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued Select ITU T or Bell This command selects the ITU T or Bell configuration for the modem n 0
32. data framed in HDLC protocol using the modulation mode selected lt mod gt may have the values shown in Table 5 2 on page 74 After receiving the FTH command the modem sends a CONNECT result code to the DTE The modem then transmits signal converter training if required fol lowed by flags until the first byte of data is sent by the DTE The modem termi nates the FTH command upon detecting lt DLE gt lt ETX gt characters in the data stream When the buffer is empty the modem computes and appends the FCS Frame Check Sequence and a closing flag to the frame The modem ensures that the minimum number of flags required by T 30 are sent before the data from the DTE begins to be transmitted The modem checks the final frame bit in the control field of each frame this is the fifth received bit of the second byte of each frame If the final frame bit is a 1 the modem ceases transmission after the frame is sent returns to command state and sends the OK result code to the DTE If the final frame bit is a 0 the mo dem sends another CONNECT result code to the DTE after the current frame is sent The modem continues to transmit flags until the DTE takes one of the follow ing actions e The DTE sends additional data The modem then transmits another frame The DTE sends only lt DLE gt lt ETX gt a null frame The modem then turns off the transmit carrier and send the OK result code to the
33. data that the DTE sent to the DCE while in command mode The ATVn command sets the DCE response codes to either text or numeric form For example upon successfully processing an AT command string the DCE sends an OK text or a 0 numeric to the DTE Examples Modem Setup Host Command Modem Response Echo Numeric E1 VO AT lt CR gt AT lt CR gt 0 lt CR gt ATS0 lt CR gt ATS0 lt CR gt 000 lt CR gt lt LF gt 0 lt CR gt Echo Text El V1 AT lt CR gt AT lt CR gt lt CR gt lt LF gt OK lt CR gt lt LF gt ATS0 lt CR gt ATS0 lt CR gt lt CR gt lt LF gt 000 lt CR gt lt LF gt lt CR gt lt LF gt OK lt CR gt lt LF gt No Echo Numeric EO AT lt CR gt 0 lt CR gt VO ATS0 lt CR gt 000 lt CR gt lt LF gt 0 lt CR gt 24 Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset No Echo Text E0 V1 AT lt CR gt lt CR gt lt LF gt OK lt CR gt lt LF gt ATS0 lt CR gt lt CR gt lt LF gt 000 lt CR gt lt LF gt lt CR gt lt LF gt OK lt CR gt lt LF gt Configure the DCE to use different response codes using the ATWn command see page 49 The setting for the ATXn command page 50 can affect which ATWn response codes are reported to the DCE The ATXn command configures the modem call progress detection and reporting requirements during dialing for example dial tone and busy tone detection The ATQn command selects whether the modem sends result codes to the DTE For example
34. escape character may 43 range between 0 127 Any value over 127 disables the escape sequence Range 0 127 Default 43 Programmer s Guide Intel Confidential 101 a 56K V 92 Data Fax and Voice Chipset intel Table 7 1 S Register Command Descriptions Continued Carriage Return Character S3 specifies the AT command string terminator and modem response code terminator The factory default is a lt CR gt or carriage return ASCII decimal 13 S3 13 Range 0 127 Default 13 Carriage Return Line Feed Character S4 specifies the line feed character which is used for verbose text modem result codes S4 10 Range 0 127 Default 10 line feed Backspace Character S5 specifies the backspace character that is used to delete the last entered character After receiving a backspace character the modem sends three characters to the DTE a backspace character a space character and then an S5 8 other backspace character Range 0 32 127 Default 8 BS Wait Before Blind Dialing S6 specifies the amount of time that must elapse after the modem goes off hook before the modem starts dialing the first telephone num ber The modem waits for at least 2 seconds before dialing the first number even if S6 is set for a value less than 2 S6 is only used for result code type commands XO S6 2 X1 and X3 that is blind dialing types of result codes Result code types X2 and X4 enable dial tone detection and ig
35. examples of the resulting connection rate when non default values are used Table 3 3 Resulting DCE to DCE Connection Rates with Non Default Values Originating Answering Modem Modem Resulting Connection Speed 9600 bps the originating modem is configured MS V34 1 0 0 MS V332 1 0 the UART data rate 9600 the UART data iS re a maximum Pasay seep 115 200 bps rate 14 400 bps ut the answering modem is configured to attempt a maximum data rate of 9600 bps MS V34 0 MS V32B 1 0 No connection the originating modem is con 28 800 28 800 UART data rate 9600 B1 and UART data rate 14 400 figured to attempt only a 28 800 bps connec tion but the answering modem is configured to 0 and UART data rate 7200 bps UART data rate 9600 bps 115 200 bps bps attempt a maximum data rate of 9600 bps 7200 bps the originating modem is configured NO MS V32 MS V34 1 0 0 to attempt connection at 7200 bps or below 1 0 9600 S37 AE The answering modem is configured to attempt a data rate of 9600 bps or below The connec tion takes place at 7200 bps the highest speed supported by both modems Programmer s Guide Intel Confidential 35 a 56K V 92 Data Fax and Voice Chipset intel 3 9 Diagnostic Testing S18 amp Tn The amp Tn command initiates loopback tests Setting S register S18 to a non zero value determines the length of testing
36. fax mode n 0 2 n 0 Disables Caller ID n 1 Enables Caller ID with formatted presentation to the DTE The modem presents the data items in a lt Tag gt lt Value gt pair format The expected pairs are data time caller code phone number and name n 2 Enables Caller ID with unformatted presentation to the DTE The modem presents the entire packet of information excluding the leading U s in ASCll printable hex numbers Note If SQ 1 auto answer mode and Caller ID is enabled in data modem mode then the modem answers only after the second ring signal Programmer s Guide Intel Confidential 83 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descriptions Continued VDR m see m Distinctive Ring Selection This command contains two parameters The first selects whether the modem reports distinctive ring cadence information The second parameter controls the timing of the RING event code report m lt enable gt lt report gt Defaults 0 0 lt enable gt Ring Reporting The DCE reports the length of the ring period Range lt enable gt 0 255 enables disables distinctive ring reporting in the form DROF lt number in units of 0 1 seconds gt lt CR gt lt LF gt lt report gt Time Ring Reporting The DCE reports the silence period s length The DCE may produce a RING event code after the DRON message if enabled by the lt report gt parameter The lt r
37. gt lt gt lt DLE gt lt 5 gt voice data lt DLE gt lt DEL gt voice data voice data lt DLE gt lt gt lt DLE gt lt 5 gt voice data lt DLE gt lt 5 gt voice da ta lt DLE gt lt DEL gt voice data 6 2 Relay Control To originate a call that is to originate call forwarding or auto dialing and to generate tones use the dialing command ATDT lt telephone number gt If the modem was not already off hook then this command automatically configures the value for AT VLS n to n 1 or n 5 depending on the value for Mn To answer a call use the AT VLS n command Unlike data mode the modem when configured for voice mode does not automatically answer an incoming call that is the modem ignores the contents of S register S0 Remote playback record takes place whenever the modem is off hook OHREL is activated For local playback record the modem is on hook and the user uses a local telephone or handset The LPHREL relay driver may be used to control the local telephone or handset when implementing local playback record mode AT VLS n Additionally voice messages may be played through the modem computer speaker The FastPath chipsets also provide a microphone interface that can be used for local recording In voice mode all voice AT commands can be issued by the DTE at any valid speed between 300 bps to 115 200 bps Typically the DTE to modem data rate is set for 19 200 bps which is the recommended d
38. in lt direction gt Alway set to 0 lt capability gt Default 0 m 0 Stream method m 1 Packet method m 2 Multi packet method lt max_codewords_tx gt Default 471 256 to 65536 lt max_codewords_rx gt Default 942 256 to 65536 lt max_string_tx gt Default 140 32 to 255 lt max_string_rx gt Default 140 32 to 255 lt max_history_tx gt Default 1884 gt 512 lt max_history_rx gt Default 3768 gt 512 Programmer s Guide Intel Confidential 71 a 56K V 92 Data Fax and Voice Chipset intel 5 FAX CLASS 1 AT COMMANDS The 56K FastPath family implements the EIA 578 data fax Class 1 AT command set standard This AT command set allows a DTE with Class 1 communication software and a MD566X based modem to communicate with Group 3 fax machines In addition these chipsets provide fax identity and test commands Fax identity commands are described in Table 5 1 all other fax AT commands are provided in Table 5 3 on page 76 This programmer s guide should be used with the Class 1 Fax Application Note and the specifications for EIA TIA 578 ITU T T 30 and T 4 The Intel Class 1 Fax Application Note shows several examples of how to use the fax AT commands and how to originate and answer a fax call 5 1 Fax Identity Commands The fax identity commands are AT FMFR AT FMDL AT FMI AT FMM AT FMR and AT FREV These commands respond back with modem manufacturer product model and product revis
39. is selected 1 E1 is selected Bit 5 0 G0 is selected 1 G1 is selected Bit 6 7 Reserved Programmer s Guide Intel Confidential 107 a 56K V 92 Data Fax and Voice Chipset intel Table 7 1 S Register Command Descriptions Continued S33 10 Sleep Mode Timer S33 determines when the modem enters sleep or power down mode When enabled S33 0 the controller enters sleep mode whenever the mo dem has been inactive for a user programmable time delay S33 The modem is considered to be in an inactive state when 1 No internal processing is being performed 2 No activity occurs between the host and the modem within a specified time period 3 The modem is off line The modem exits sleep mode whenever the host reads or writes to the modem or when a ring signal is detected Sleep mode is disabled by setting S33 to 0 Range 0 90 seconds 37 Maximum Line Speed Attempted This S register selects the maximum line speed allowable that is the modem attempts to connect at this speed or falls back to a low er speed Settings for Bn MS m Nn and S37 determine the allowable modem connections S37 provides the same information as the MS m lt max rate gt param eter Changing the MS m lt max rate gt parameter automatically changes the value of S37 For example setting MS m lt max rate gt to 0 sets S37 to 0 Note that S37 has no effect during V 32 bis retraining rate negotiation 108 In
40. mode KO 2 4 E sends break and enters com K1 3 5 Immediately sends the break through In connect state receives break at modem port and sends to serial port KO 1 Destructive expedited 14 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 2 2 V 44 V 42 V 42 bis MNP Command Summary Continued Note Command Function Default Range j K2 3 Nondestructive expedited K4 5 Nondestructive nonexpedited i Nn Set operating mode 3 0 4 yes NO N1 ar pee eae Normal mode with speed N2 Selects MNP Reliable mode N3 Selects V 42 Auto reliable mode N4 Selects V 42 Reliable mode O Originate reliable link none no i Qn Set serial port flow control 3 0 3 yes Q0 Disables flow control Q1 XON XOFF software flow control Q2 Unidirectional hardware flow control Q3 Bidirectional hardware flow control i TO Disables inactivity timer 0 0 90 yes U Accept reliable link none no Xn Set XON XOFF pass through 0 0 1 yes XO Processes flow control characters xX4 Processes flow control characters and passes to local or remote Y Switch to Reliable mode none no Z Switch to Normal mode none no 7 Jn Set V 42 detect phase 1 0 1 yes JO Disables the V 42 detect phase J1 Enables the V 42 detect phase i Hn V 42 bis compression control 3 0 3 yes HO Disables V 42 bis H1
41. name n 4 Modem Manufacturer n 5 Reports the following hardware configuration programmed host in terface HOST I F program memory P Mem data memory D Mem and DSP code location see example at the end of the In description n 6 Country Code n 7 Modem Manufacturer n 8 Modem firmware features Bit O 00 Serial 01 Parallel Bit 1 10 PCMCIA 11 USB Bit 4 Voice 0 disabled 1 enabled Bit 5 V 80 0 disabled 1 enabled Bit 8 International Homologation 0 disabled 1 enabled Bit 9 0 V 90 Autodetect 1 V 90 only In 0 Bit12 0 400 Series DSP 1 800 Series DSP Bit 13 Program Space 0 Internal 1 External Bit 14 0 patched 1 patchless Bit 2 3 6 7 10 11 and 15 Reserved n 9 Reserved n 10 Modem board configuration Bit O 0 Telephone Emulation mode not supported 1 Telephone Emulation mode supported Bit 1 0 Digital speakerphone not supported 1 Digital speakerphone supported Bit 2 0 Reserved 1 Reserved Bit 3 0 No Caller ID 1 Caller ID hardware on board Bit 4 0 Reserved 1 Reserved Bit 5 0 No plug and play 1 Plug and play supported by board Bit 6 0 Microcontroller firmware in EPROM 1 Microcontroller firmware in FLASH Bit 7 Reserved Programmer s Guide Intel Confidential 45 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued Identification Checksum Option cont n 11 Modem board configuration Bit O 0 Modem only
42. not indemnify nor in any way provide protection for patent or possible patent violations to its customers or users of its products 3 10 1 Time Independent Escape Sequence The TIES Time Independent Escape Sequence implemented with AT was developed by a group of modem manufacturers as an alternative to the Hayes Escape Sequence TIES was designed for compatibility with existing communication software written for the Hayes Escape Sequence The DTE implements the escape sequence by sending the escape character as defined in S2 three times followed by a valid AT command and then the contents of S3 typically a lt CR gt Upon detecting the three consecutive escape characters the modem changes to TIES command mode and starts an internal EPD Escape Prompt Delay timer with the time limit defined by 12 The modem then looks for one of the following conditions to occur 1 No additional data is received and the EPD timer times out the modem sends an OK message to the DTE and then waits indefinitely for an incoming valid AT com mand string from the DTE Until the modem receives a valid AT command it moni tors any data received from the DTE and passes on the data to the remote modem that is the modem does not echo back the received character to the DTE a If the subsequent character received by the modem is not an A or a the modem returns to data mode and sends a CONNECT message back to the DTE b I
43. s guide the Intel ZS 701 Voice Application Note shows a number of ways to use these AT commands This product is compatible with the EIA TIA IS 101 voice command set This section lists supported commands and a detailed description of each command see Table 6 1 on page 82 When multiple commands are placed on a line a semicolon must be placed after each voice and fax command See Table 2 6 and Table 2 7 on page 19 for voice character pairs DTE to DCE and DCE to DTE To originate a call to answer and to hang up use the ATD AT VLS 0 and AT VLS 0 commands respectively Each command may be used as follows V lt command gt Read current setting V lt command gt Read permissible settings V lt command gt lt parameter gt Set parameter For example AT FCLASS determines whether the modem is configured for data or fax mode or voice mode AT FCLASS determines which data fax voice modes are supported by the modem AT FCLASS n switches between voice mode and data mode The modem exchanges streams of data with the DTE while executing the commands for voice playback AT VTX and record AT VRX and while in voice command mode with either the modem being off hook or using the local phone AT VLS n In these modes the DCE searches for DTMF calling tone and dial tones and reports them to the DTE whenever they are detected Detection information and data stream terminators are passed between the DTE and DCE by first se
44. selected carrier the modem transfers all received data patterns to the DTE as consecutive start stop framed bytes including leading marking con ditions or flags The modem marks the end of the data stream with lt DLE gt lt ETX gt Upon loss of carrier the modem returns to command state and sends a NO CAR RIER result code to the DTE Note Ifthe modem is on hook then the modem always returns an ERROR message to the DTE after receiving the FRM lt mod gt command Range lt mod gt 24 48 72 73 74 96 97 98 121 122 145 146 Refer to Table 5 2 on page 74 FRS n none Wait for Silence The FRS lt TIME gt command causes the modem to send an OK result code to the DTE when silence has been detected on the line for the amount of time specified The value lt TIME gt is in 10 ms intervals The command terminates when the required amount of silence has been detected on the line or the DTE sends the modem another character that is discarded In either event the DTE returns the OK result code Range lt TIME gt 1 255 10 ms Programmer s Guide Intel Confidential 77 a 56K V 92 Data Fax and Voice Chipset intel Table 5 3 Note Command Fax Mode Command Descriptions Continued An asterisk denotes the factory default setting Default Description FTH n none Transmit HDLC Data The FTH lt mod gt command causes the modem to trans mit
45. terminator Upon detecting lt DLE gt lt DLE gt the DTE must reinsert a single lt DLE gt in its place The modem buffers up to 512 bytes of voice data received from the SAFE analog to digital converters if the DTE cannot read the data immediately Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset 6 1 DTMF Detection DTMF detection information is handled differently than other detection information IS 101 specifies that more than one lt DLE gt lt DTMF CHAR gt character pair may be sent for a single DTMF tone burst As such the modem sends delimiter lt DLE gt character pairs to indicate the end of a tone burst When a DTMF tone is detected in playback or command mode the modem sends lt DLE gt lt DEL gt to indicate the end of a burst For example from a single burst of DTMF 5 tones the following reports are possible Playback and voice command modes lt DLE gt lt 5 gt lt DLE gt lt DEL gt When a DTMF tone is detected in the record mode the modem sends lt DLE gt lt gt to indicate the beginning of a tone burst The modem may then send one or more lt DLE gt lt DTMF CHAR gt character pairs followed by lt DLE gt lt DEL gt which signifies the end of the tone For example from a single burst of DTMF 5 tones the following reports are possible Record mode only voice data lt DLE
46. the link to be established refer to the preceding O command Set XON XOFF Pass Through If software flow control is enabled Q1 this com mand defines whether the XON 11h and XOFF 13h characters received from the DTE are sent to the remote modem In addition if the modem port flow control is en abled G1 in normal mode the command specifies whether the XON and XOFF characters received from the remote modem are sent to the DTE In both cases flow control operation is not affected n O 1 n 0 Processes flow control characters n 1 Processes flow control characters and passes them through to the local or remote so they can process the characters Y none Switch to Reliable Mode In buffer normal mode NO or N1 the modem at tempts to originate or answer an MNP link request depending on whether the mo dem originated or answered the physical connection respectively The remote mo dem must attempt to answer originate the MNP link for the link to be established Z none Switch to Buffer Mode During an MNP link the modem disconnects the link exit error correction data compression and changes to buffer mode without disconnect ing the modem to modem connection Programmer s Guide Intel Confidential 69 a 56K V 92 Data Fax and Voice Chipset intel Table 4 2 V 44 V 42 V 42 bis and MNP Data Mode Command Descriptions Set V 42 Detect Phase In V 42 modes N3 N4 this com
47. yes amp YO Recall stored profile 0 on power up amp Y1 Recall stored profile 1 on power up Ea n 0 3 amp Zn x ae ee O up to 30 digits to aaa hee aay o En Auto retrain control 1 0 1 yes EO Disables auto retrain E1 Enables auto retrain i Gn Rate renegotiation 1 0 1 yes GO Disabled G1 Enabled Cn Generate data mode calling tone 0 0 2 yes CO Calling tone disabled C1 1300 Hz calling tone enabled C2 V 8 calling tone and 1300 Hz calling tone GMI Identify modem manufacturer none no GMM Identify product model none no GMR Identify product revision none no MS m Modulation selections Se 1 See note no PCW m Call waiting enable 0 0 1 2 no PMH m Modem on hold enable 0 0 1 no PMHT m Modem on hold timer 0 0 13 no PMHR Initiate modem on hold none 0 13 no PIG m PCM upstream ignore 0 0 1 no PMHF V 92 modem on hold hook flash none no PQC m V 92 phase 1 and phase 2 control 0 0 1 2 3 no PSS m Use short sequence 2 0 1 2 no a See the MS m description on Table 3 4 of the MD566X Programmer s Guide for a full command description of parameter ranges For Data mode the factory default setting is AT MS V90 1 0 0 to send at speeds of 33 600 bps or below and receive at speeds of 53 333 bps and below Value saved in NVRAM Command not preceded by an AT Intel Confidential Programmer s Guide Programmer s Guide Intel Confidential 56K V 92 Data Fax and Voice Chipset 56K V
48. 0 115 200 8000 1 9600 96 000 115 200 9600 1 11 025 110 250 115 200 11 025 1 lt cml gt LIN2 4800 96 000 115 200 9600 1 NOTES 1 Because of the high UART data rates these compression sample rates may not be applicable to the serial host interface that is serial box modem designs see ATI5 to determine if the modem is using the serial host inter face For parallel and PC Card host interfaces the modem ignores the UART data rate 2 DTMF detection is provided for all sample rates Programmer s Guide Intel Confidential 95 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descriptions Continued Speakerphone On Off Control This command turns on the speakerphone function This feature provides full duplex speakerphone capabilities with internal adaptive echo cancellers This command takes the received voice signal and loops it back to the analog transmit pins The host must configure the relays and microphone interface as necessary using the AT VLS n command Typically this means setting the off hook relay driver speaker and microphone inputs with AT VLS 7 VSP n 0 After enabling the speakerphone mode VSP 1 the modem remains in voice command mode and provides information about local off hook detection DTMF detection and tone detection if supported by the modem board n 0 1 n 0 Speakerphone mode disabled n 1 Speakerphone mode enabled Speakerphone Type Selection This
49. 1 W3 X4 YO amp C1 amp D2 amp GO amp J0 amp PO amp Q0 amp S0 amp U0 amp Y0 amp Vn A013 C1 E1 G1 A3 CO GO JO K5 N3 Q3 TOOO XO C1 J1 H3 0032 00 001 S01 000 S02 043 S03 013 S04 010 S05 008 S06 002 S07 060 S08 002 S09 006 S10 014 S 11 070 12 050 S18 000 25 005 S30 000 33 010 37 000 STORED PROFILE 0 B1 E1 L2 M1 N1 P QO V1 W3 X4 YO amp C1 amp D2 amp GO amp J0 amp PO amp Q0 amp S0 amp U0 A013 C1 E1 G1 A3 CO GO JO K5 N3 Q3 TO00 X0 C1 J1 H3 0032 S00 001 S02 043 S06 002 S07 060 S08 002 S09 006 S10 014 11 070 12 050 S18 000 25 005 30 000 33 000 37 000 TELEPHONE NUMBERS amp Z0 12345 amp Z1 4444444 amp Z2 12345 amp Z3 11234567890 OK Store Active Profile This command causes the modem to store a subset of the active profile command and S register configurations into the NVRAM amp Wn user profile n n 0 Store in user profile 0 n 1 Store in user profile 1 Programmer s Guide Intel Confidential 53 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued Select Stored Profile on Power up This command selects the particular stored user profile from the NVRAM to be loaded into the active profile upon amp Yn 0 modem power up n 0 Select profile O n 1 Select profile 1 Store Telephone Number This command stores a telephone number up to 30 digits including dial modifiers in the NVRAM To dial the stored tele
50. 666 44 000 45 333 46 666 48 000 49 333 50 666 52 000 53 333 54 666 and 56 000 bps 56K V 92 asymmetrical connections transmit 24 000 25 333 26 666 28 000 29 333 30 666 32 000 33 333 34 666 36 000 37 333 38 666 40 000 41 333 42 666 44 000 45 333 46 666 48 000 bps uve 56K V92 asymmetrical connection receive 28 000 29 333 30 666 32 000 33 333 34 666 36 000 37 333 38 666 40 000 41 333 42 666 44 000 45 333 46 666 48 000 49 333 50 666 52 000 53 333 54 666 56 000 bps Programmer s Guide Intel Confidential 33 a 56K V 92 Data Fax and Voice Chipset intel 34 The allowable connection modulations and data rates are determined by the MS m command which uses four parameters lt carrier gt lt automode gt lt min rate gt and lt max rate gt The MS m lt carrier gt parameter defines the top modulation rate The lt automode gt parameter determines whether the modem connection is allowed to fall down to a lower modulation rate if the connection can not be made at a specified modulation or if the modem connection can only take place at the specified modulation Setting lt automode gt to 1 allows the modem to connect at a slower lt carrier gt type than that specified Setting lt automode gt to 0 allows the connection to use only the specified lt carrier gt type The lt min rate gt parameter defines the lowest data rate at which a modem connection can take pla
51. 92 Data Fax and Voice Chipset intel Table 2 2 V 44 V 42 V 42 bis MNP Command Summary Note Command Function Default Range pens g An Set auto reliable fallback character 13 0 127 yes is Cn MNP 5 data compression control 1 0 1 yes CO No compression C1 Enables MNP5 data compression i An MNP block size 3 0 3 yes AO Maximum 64 characters A1 Maximum 128 characters A2 Maximum 192 characters A3 Maximum 256 characters T Bn Transmit break none 0 9 no Cn Set auto reliable buffer 0 0 2 yes CO No data buffering c1 Four second buffer until 200 characters in the buffer or detection of a SYN character c2 No buffering Connects non V 42 modems to V 42 modem 4 Gn Set modem port flow control 0 0 1 yes GO Disables port flow control G1 Sets port flow control to XON XOFF i Jn bps rate adjust control 0 0 1 yes JO Disables rate adjust J1 Enables rate adjust i Kn Set break control 5 0 5 yes In connect state transmits break to remote if in Reliable mode KO 2 4 Enters Command mode no break sent K1 Destructive expedited K3 Nondestructive expedited K5 Nondestructive nonexpedited In command state transmits break to remote if in Reliable mode KO 1 Destructive expedited K2 3 Nondestructive expedited K4 5 Nondestructive nonexpedited In connect state receives break at modem port if in Direct
52. ECT 9600 12 CONNECT 19200 14 CONNECT 38400 28 CONNECT 57600 18 CONNECT 115200 31 CONNECT DTE data rate modulation error correction data com See Note pression TX DCE transmit data rate RX DCE receive data rate Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Note The W3 AT command reports the special verbose code listed which is used to evaluate the modem connection The W0 W2 AT commands report all other CONNECT messages When the modem is configured for text responses using V1 the W3 verbose response provides information about the DTE data rate connection modulation error correction protocol data compression and modem to modem data rate When the modem is configured for W3 and numeric responses using VO the modem responds as if it were set up for WO Table 2 13 Manufacturing Only Command Summary Note Command Function Default Range ii NCnn Country Select 0 P m Set plug and play board serial number none 0 255 0 255 0 255 0 255 F 91 Select transmit level dBm 10 0 15 i 92 DTMF transmit level dBm 10 0 15 VGPO n Read write to general purpose pins 0 7 See note VGP1 n Read write to general purpose pins 8 15 See note VGP2 n Read write to general purpose pins 16 23 See note TTnn Tone test 00 a These commands are meant to be used by the board manufacturer and not in generic
53. Hz guard tone amp G2 Enables 1800 Hz guard tone amp Kn Select serial flow control 3 0 3 4 yes amp KO Disables flow control amp K3 Bidirectional hardware flow control amp K4 XON XOFF software flow control e eae ee ro i amp Pn Dial pulse ratio 0 0 1 yes RPO Sets 10 pps pulse dial with 39 61 make break amp P1 Sets 10 pps pulse dial with 33 67 make break amp Q0 SH a modem sup 0 0 yes amp Sn DSR data set ready option 0 0 1 yes amp SO DSR is always active gs1 DSR active only during handshaking and when carrier is lost amp Tn Self test commands 0 0 1 8 no amp TO Terminates test in progress amp T1 Initiates local analog loopback amp T8 Initiates local analog loopback with self test i amp Un Disable Trellis coding 0 0 1 yes amp UO Enables Trellis coding with QAM as fallback amp U1 QAM modulation only amp Vn View active and stored profiles 0 0 1 no amp VO View active profile and stored profile 0 amp V1 View active profile and stored profile 1 Programmer s Guide Intel Confidential 11 56K V 92 Data Fax and Voice Chipset intel Table 2 1 Data Mode Command Summary Continued Note Command Function Default Range paa by amp Wn Stored active profile 0 0 1 no amp WO Store in user profile O amp W1 Store in user profile 1 E amp Yn Select stored profile on power up 0 0 1
54. IFO mode the modem keeps track of the character in which an error has occurred and does not report the error to the DTE until the associated character gets to the top of the stack Note In FIFO mode the DTE must write a data byte in the RX FIFO by the loopback mode to write to LSR2 LSR4 LSRO and LSR7 cannot be written to in FIFO mode Error in RCVR FIFO In 16C450 emulation mode this bit is always a O Bit 7 In FIFO mode this bit is set to 1 by the DCE whenever at least one parity error framing error or break indi cation has occurred in the RCVR FIFO This bit is cleared when the DTE reads the LSR register and there are no subsequent FIFO errors TEMT Transmitter Empty This bit is set to 1 by the DCE whenever the THR Transmit Holding register and transmitter shift register are empty This bit is automatically reset to O by the DCE whenever the host writes a byte to the THR In FIFO mode this bit is set to 1 whenever the transmitter FIFO and shift register are both empty Bit 6 THRE Transmitter Holding Register Empty This bit is set to 1 whenever the THR Transmit Holding register is empty This bit is set to O whenever the host writes data into the THR Additionally if the THREIE Transmitter Holding Register Empty Interrupt Enable is set to 1 the modem causes an interrupt to the host whenever THRE goes to 1 In FIFO mode this bit is set to 1 whenever the XMIT
55. MNP 2 5 V 42 V 42 bis V 42 V 42 bis V 42 Cae Modem hangs up MNP 2 5 V 42 V 42 bis V 42 V 42 bis NOTES 1 MNP 5 requires the modem to be configured for C1 2 V 42 bis requires the modem to be configured for H3 3 Refer to Cn and An commands for more information about auto reliable mode 64 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset The list of commands needed to enter a specific error correction or data compression mode are as follows V 42 bis with fallback to MNP5 amp F N3 or N3 H3 SCL MNP2 4 or V 42 V 42 bis with fallback to V 42 MNP2 4 amp F N4 CO or N4 3CO H3 J1 V 42 bis only amp F N4 J0 or N4 J0 H3 V 42 only amp F N4 J0 HO or N4 J0 HO MNP5 with fallback to MNP2 4 amp F N2 or N2 SC1 MNP2 4 only amp F N2 CO or N2 Programmer s Guide Intel Confidential 65 a 56K V 92 Data Fax and Voice Chipset intel Table 4 2 V 44 V 42 V 42 bis and MNP Data Mode Command Descriptions Note An asterisk denotes the factory default setting Command Default Description Set Auto Reliable Fallback Character In auto reliable mode N3 with auto reli able fallback character enabled C2 receipt of the fallback character from the line during the V 42 detection phase causes the modem to switch to buffer normal An 13 mode This allows a remote user with a non V 42 modem to connect immediately
56. PRESSION The MD566X chipsets support two types of data mode error correction MNP 2 4 and V 42 and data compression V 44 MNP 5 and V 42 bis V 42 error correction uses LAPM as the primary error control protocol and uses MNP 2 4 as an alternative V 44 provides enhanced data compression over the existing V 42bis standard Data compression is up to on average 40 faster than previous methods This provides for faster web browsing and data downloading The DS44 command configures the operation of V 44 There are nine parameters associated with the DS44 command For a detailed description of this command refer to Table 4 2 V 42 bis data compression requires V 42 LAPM only MNP 5 requires MNP 2 4 The MD566X chipsets support four operating modes buffer normal MNP reliable V 42 auto reliable and V 42 reliable These four modes are selected by the Nn command They allow the DCE to communicate with remote modems that may or may not support error correction and data compression Speed buffering which is used for all operating modes allows the DTE to modem data rate to be different from the modem to modem data rate This is accomplished by using transmitter and receiver buffers in the modem Thus the DTE to modem data rate can be set for 2400 bps when the modem to modem data rate is 300 bps without causing any data errors In all data modes the DTE to modem data rate can be set for any valid speed between 300 bps to 115 200 bps that is the
57. TD to the DCE Manual answer mode is accomplished by sending an ATA to the DCE Automatic originate mode is initiated by sending an ATD lt telephone number amp dial modifiers gt or ATDS n to the DCE Automatic answer mode is accomplished by setting S register SO to a non zero value S1 keeps track of how many ring signals are detected If the content of SO is non zero and the number of ring signals as defined by SO are detected that is S1 S0 then the DCE goes off hook and attempts to connect to the remote modem with the following exceptions 1 The time period between the ring signals is greater than 8 seconds which causes the S1 counter to reset and thus never reach the value for SO 2 Caller ID is enabled and S0 1 the modem answers on the second ring signal instead of the first ring signal This happens because Caller ID puts a signal on the telephone line between the first and second ring signal Example ATDT9 444 5555 Automatically dials the telephone number with DTMF tones After dialing a 9 the comma causes the modem to pause two seconds before dialing the rest of the telephone number modem 1 ATD When establishing a manual to manual connection the designated originating modem 2 ATA modem should receive the ATD command from its DTE just before the designated answering modem receives the ATA command from its DTE It is important that the time between the ATD and ATA commands is less than 2 s
58. V 21 channel 1 space 1180 Hz V 21 channel 2 space 1850 Hz V 23 backward channel space 450 Hz V 23 forward channel space 2100 Hz silence V 25 Answer Tone 2100 Hz Guard Tone Data Fax answer mode 1800 Hz V 25 Calling Tone 1300 Hz FAX Calling Tone 1100 Hz Data Answer Tone Bell mode 2225 Hz Guard Tone Data FAX answer mode 550 Hz Programmer s Guide Intel Confidential 115 56K V 92 Data Fax and Voice Chipset intel Table 9 1 Manufacturing Only Command Descriptions Continued Tone Test Command Continued Analog Loopback ALB Test n 15 V 22 ALB originate n 16 V 22 bis ALB originate n 17 V 22 ALB answer n 18 V 22 bis ALB answer n 20 V 32 ALB 9600 originate n 21 V 32 bis ALB answer n 60 V 34 ALB 2400bps n 61 V 34 ALB 4800bps n 62 V 34 ALB 7200bps n 63 V 34 ALB 9600bps n 64 V 34 ALB 12000bps n 65 V 34 ALB 14400bps n 66 V 34 ALB 16800bps n 67 V 34 ALB 19200bps n 68 V 34 ALB 21600bps n 69 V 34 ALB 24000bps TTnn 00 n 6a V 34 ALB 26400bps n 6b V 34 ALB 28800bps n 6c V 34 ALB 31200bps n 6d V 34 ALB 33600bps FAX Test n 40 FAX configure V 27 300bps n 41 FAX configure V 27 2400bps n 42 FAX configure V 27 4800bps n 43 FAX configure V 29 7200bps n 44 FAX configure V 29 9600bps n 45 FAX configure V 17 7200bps long train n 46 FAX configure V 17 7200bps short train n 47 FAX configure V 17 9600bps long train n 48 FAX configure V 17 9600bps short train n 49 FAX co
59. a connection is established with the remote modem as shown below with LAPM error correction and V 42 bis data compression The telephone line or modem to modem connection data rate is 33 600 bps and the local UART DTE to modem connection rate is 115 200 bps Telephone Line 33 600 bps UART Interface 115 200 bps LOCAL MODEM REMOTE MODEM Figure 3 1 Example of a Remote Connection The modem then sends the CONNECT messages for the following three Wn commands 1 ATWO CONNECT 115200 2 ATW2 CONNECT 33600 3 ATW3 CONNECT 115200 V34 LAPM V42B TX 33600 RX 33600 3 3 Modem Reset and NVRAM Commands DS n Zn amp F amp Vn amp Yn amp Wn amp Zn x On powering up the DCE defaults to the configuration specified in NVRAM The DCE may then be configured as needed The DTE stores the DCE configuration in the NVRAM by first setting up the current configuration and then sending an AT amp Wn command The DCE configuration stored in the NVRAM is called a user profile Two independent user profile configurations and four telephone numbers can be stored Either user profile configuration can be used for the power up defaults AT amp Yn While in command mode the DCE can be re initialized at any time and the user profile changed using the ATZn command To configure the modem to factory defaults the AT amp F command is used A summary of the active user profile two NVRAM user profiles and P
60. activity timer During voice receive mode the modem informs the DTE about pertinent events that may prompt the DTE to terminate the voice receive state The DCE sends lt DLE gt codes for detection of signals such as busy tone dial tone DTMF tone and codes for Presumed End of Message or Presumed Hang up Record mode is terminated whenever the modem issues a lt DLE gt lt ESC gt command or provides a DTE DCE inactivity timer time out Upon detecting the terminating character the modem stops sampling the analog data The modem then termi nates record mode by sending the remaining voice data stored in its internal buff er lt DLE gt lt ETX gt and an OK message to the DTE In some situations the application software may want to abort record mode and immediately perform a new function without first reading all the recorded voice data from the modem s internal buffer for example after detecting fax calling tone This is accomplished by sending lt DLE gt lt gt to the modem while in record mode Upon seeing lt DLE gt lt gt the modem terminates record mode clears the modems internal record buffer and issues a lt DLE gt lt ETX gt to the DTE followed by an OK message The modem may immediately abort record mode if it receives either an AT VIT n time out or a DTR toggle If VIT 0 and the modem has not received any data or a lt DLE gt lt NUL gt cod
61. are implemented incorrectly The test commands AT FTTn and AT FRTn allow the modem manufacturer to test the fax transmit and receive modes during manufacturing testing The MD566X chipsets include three commands VGPO n AT VGP1 n and AT VGP2 n that may be used by modem manufacturers to provide additional or unique features These commands should not be used by general purpose software packages Table 9 1 Manufacturing Only Command Descriptions Command Default Description Country Select This command is for international use It sets the country specific parameters including S register settings The command checks whether an entered country code matches one of the codes stored in EPROM If so the entered code is stored in NVRAM This code is loaded from NVRAM upon power up or soft reset The default value is used if no NVRAM is installed or if the NVRAM failed the self test during reset In the case of virgin NVRAM the country code is not initialized and the country code 0 will be loaded as a default This may cause an anomaly such as dial tone detec tion The AT NCn amp W n 0 to 9 command is required to avoid this anomaly from power up The commands AT amp F and ATZ do not change the country code after the country is selected by the AT NCn amp W command The command ATI6 shows the specific country where that modem operates The command AT NCn followed by AT amp W has the same effect as the AT NCn amp W command
62. ata rate for Class 1 fax mode The DTE to modem data rate may need to be set to 115 200 bps in certain instances such as during playback or during record mode for a CL1 compression scheme The following data and fax AT commands are supported in voice mode Data All except ATA ATIn Fax FCLASS Programmer s Guide Intel Confidential 81 a K V 92 Data Fax and Voice Chipset 56 X i ip ntel Ta ble 6 1 Voice Mode Command Descriptions Note Command An asterisk denotes the factory default setting Description FCLASS 8 Voice Mode Selection This command enables or disables voice mode All voice mode commands except for FCLASS n are valid only in voice mode n 0 1 8 n 0 Data mode n 1 Class 1 fax mode n 8 Voice mode enabled FLO n Flow Conirol Select This command allows the DTE to identify and select the types of flow control used DCEs using the IS 101 standard must support in band XON XOFF flow control XON is the ASCII lt DCI gt character 11h XOFF is the ASCII lt Dc3 gt character 13h The DCE may provide ITU T s V 24 CTS circuit 106 and RTS circuit 133 for flow control n 0 1 2 n 0 Disables XON XOFF and CTS RTS flow control n 1 Enables XON XOFF flow control in either direction n 2 The DTE uses ITU T s RTS to control flow to the modem the modem uses ITU T CTS to control flow to the DTE 82 Intel Confidential Programmer s Guide intel
63. atch one of the lt carrier gt data rates then the modem uses the next fastest data rate The MS command sets the modulation speeds in the MD566X chipsets however to set the modulation to either V 22 or Bell 212 the BO or B1 command also must be sent To set the modulation type to ITU T V 22 send the BO command to set the modulation type to Bell 212 send B1 These commands can be entered before or after the MS command For example to set the modulation to ITU T V 22 MS v22 1 1200 1200 BO It is important to remember that the ordering of commands is important in configuring the modem For example if the DTE 9600 bps data rate and the AT commands are issued in the following sequence different connection rates result 1 ATS37 0 2 AT MS V32B 1 0 14400 AT MS V32B 1 0 14400 ATS37 0 ATDT1234 ATDT1234 CONNECT 14400 CONNECT 9600 Table 3 3 shows the resulting connection data rate when using non default values Because of impairments on the telephone line the actual connection speeds may be lower than the speeds defined in this table For V 92 V 90 and V 34 modulations the modem can receive data at a different data rate than the transmit data rate All other modulation types besides V 23 and V 34 use the same data rate for the transmitter and receiver Use ATW3 to see the modem s actual receive and transmit data rates the modem must be configured for ATV1 text response codes Table 3 3 shows
64. ation of data associated with the Caller ID services in United States and Canada in the ICLID incoming call line ID data format The ICLID data comes in one of two formats SDM single data message format or MDM multiple data message format In both formats data is provided as data items and packet control information When enabled the DCE reports any Caller ID information detected after the first ring message note that more lt CR gt lt LF gt combinations may occur after the RING result code All data items are reported using the lt tag gt lt gt lt value gt pair format Spaces are present on both sides of the equal sign This chipset allows for two types of Caller ID reporting formats formatted and unformatted In formatted reporting DCE does not report any Caller ID information if a check sum error is detected in the Caller ID packet If the DCE receives multiple copies of the Caller ID packets the DCE sends only one of the correct packets to the DTE If the DCE has never presented a correct packet but has received the line seizure information at least once the DCE returns lt MESG gt lt gt lt CALID_202 gt The DCE breaks up the presentation of the date and time into two separate lt Tag gt lt Value gt pairs for those data items where the date and time appear together Table 8 1 Caller ID Tags for Formatted Reporting Tag Description DATE DATE MMDD where MM is the month number 01 through 12 and
65. ax_history_tx gt lt max_his tory_rx gt lt direction gt which specifies the desired direction s of operation of the data compression function from the DTE point of view lt compression_negotiation gt which specifies whether or not the DCE should continue to op erate if the desired result is not obtained lt capability gt which specifies the use of stream method packet method multi packet method lt max_codewords_tx gt which specifies the maximum number of codewords which should be negotiated in the transmit direction lt max_codewords_rx gt which specifies the maximum number of codewords which should be negotiated in the receive direction lt max_string_tx gt which specifies the maximum string length to be negotiated in the transmit direction lt max_string_rx gt which specifies the maximum string length to be negotiated in the receive direction 3 0 0 471 lt max_history_tx gt which specifies the maximum size of the history buffer to be negotiated 972 140 in the transmit direction DS44 m 140 1884 lt max_history_rx gt which specifies the maximum size of the history buffer to be negotiated 3768 in the receive direction lt direction gt Default 3 m 0 Negotiated no compression m 1 Transmit only m 2 Receive only m 3 Both directions accept and direction lt compression negotiation gt Default 0 m 0 Do not disconnect if REC V 44 is not negotiated by the remote DCE as specified
66. board 1 Modem and sound card board Bit 1 0 No microphone jack 1 Microphone jack on board Bit 2 0 No external speaker 1 External speaker on board Bit 3 0 No local telephone off hook detection on board 1 Local telephone off hook detection on board Bit 4 0 No earphone support on board 1 Earphone support on board Bit 5 7 Reserved n 12 Reserved n 13 Reserved n 14 SAFE device n 20 Line status information n 21 Reserved n 22 Reserved In 0 n 23 Reserved cont n 24 Reserved n 25 Reserved Examples ATT1 CD08 55 612 10 19 99 PARALLEL SPEAKERPHONE05 DSPPATCH 001 55 OK ATI2 ROM TEST OK ATI3 MD56xx OK ATI5 Full V 92 upgradeable Note V 92 version only Present 32k DSP RAM 000 HOST I F Parallel 001 P Mem 016 Bi DSP Code location D Mem 008 Bit 001 W S W S External RAM 46 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued Speaker Volume Control This command selects the modem s speaker vol ume Ln 2 n 0 Low speaker volume n 1 Low speaker volume n 2 Medium speaker volume n 3 High speaker volume Speaker Control This command specifies when the speaker is turned on and off Mn 1 n 0 Speaker always off n 1 Speaker on until carrier present n 2 Speaker always on n 3 Speaker off during dialing and on until carrier Select Data Rate
67. ce Setting lt min rate gt to 0 has one of two meanings depending on the lt automode gt setting When both lt automode gt and lt min rate gt are set to 0 then the lowest data rate at which the connection can take place is the lowest data rate specified by the lt carrier gt parameter If lt automode gt is set to 1 and lt min rate gt is set to 0 then the lowest data rate is 300 bps The lt max rate gt parameter defines the highest data rate at which a modem connection can take place If the lt max rate gt is set to 0 the modem uses the DTE data rate or a slower lt carrier gt data rate as the highest permitted connection data rate This highest permitted data rate means the modem attempts to connect at this data rate but may connect at a slower rate because of line impairment If lt max rate gt and lt automode gt are set to 0 and the DTE data rate is below the lowest data rate supported by the modulation rate then the modem s connection attempts always fail and the modem reports a NO CARRIER message If the MS m parameters contain conflicting information like MS V34 1 14400 0 with a DTE data rate of 2400 bps then the modem s connection attempts always fail and the modem reports a NO CARRIER message This happens for two reasons First when the modem receives the MS m command the modem does not check for conflicts of valid parameter information Secondly some of the same configuration information is p
68. command determines which speaker phone type is used when the modem receives a VSP n command This allows the application software to select whether telephone emulation or digital speak erphone is used for VSP n Upon powering up the modem determines wheth er it can support a digital speakerphone mode If digital speakerphone is support VSPS n 1 ed then the factory default value is equal to 1 If the digital soeakerphone is not supported then the factory default is O n 0 1 n 0 Telephone Emulation Mode speakerphone met Digital speakerphone Beep Tone Duration Timer This command sets the default duration of all DTMF tones VTD n 100 n 5 255 units of 0 01 seconds Default n 100 n 100 Default value 1 second 96 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued VTS m none DTMF and Tone Generation This command causes the modem to generate DTMF tones or pulse tones in voice mode The lt DLE gt lt gt code aborts the play back of tones sends the OK result code and returns the modem to the voice command state The DTE DCE inactivity timer is in place during tone production The command VTS sent without a parameter assumes the default value which is a null string The DTE may use the lt DLE gt lt NUL gt shielded code to refresh the timer lt string gt The lt string gt is made up of a lis
69. commands amp F and Zn have no effect on S92 Since the function of S92 relates to modem hardware this command should only be used by the modem manufacturer and never used by a software developer or end S92 10 user In some countries the end user is not allowed to change the transmit level In these countries the country PTT checks to make sure that the end user can not change the transmit level Range 0 to 15 15 dBm Default 10 10 dBm 114 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 9 1 Manufacturing Only Command Descriptions Continued Tone Test Command This command outputs the corresponding tones for testing DTMF ALB and FAX Tone Test n 00 n 01 n 02 n 03 n 04 n 05 n 06 n 07 n 08 n 09 n 0A n 0B n 0C n 0D TTnn 00 there n OF n 10 n 11 n 12 n 13 n 19 n 1A n 1B n 1C n 30 n 31 n 32 n 33 n 34 n 35 n 36 DTMF digit 0 941 1336 DTMF digit 1 697 1209 DTMF digit 2 697 1336 DTMF digit 3 697 1477 DTMF digit 4 770 1209 DTMF digit 5 770 1336 DTMF digit 6 770 1477 DTMF digit 7 852 1209 DTMF digit 8 852 1336 DTMF digit 9 852 1477 DTMF digit 941 1209 DTMF digit 941 1477 DTMF digit A 697 1633 DTMF digit B 770 1633 DTMF digit C 852 1633 DTMF digit D 941 1633 V 21 chn 1 mark orig 980 Hz V 21 chn 2 mark 1650 Hz V 23 backward chnl mark 390 Hz V 23 forward chnl mark 1300 Hz
70. d pause none 0 255 no Table 2 5 1IS 101 Voice Command Summary F Reported Command Function Default Range by amp Vn FCLASS 8 Voice mode selection 0 0 1 8 no FLO n Flow Control Select 1 0 2 no VBT m Buffer threshold setting 192 320 192 320 no VCID n Caller ID selection 0 0 2 no VDR m Bi a 0 255 Distinctive Ring selection 0 0 0 255 no VEM m Cc F BB860980 Event reporting and masking BFE63883 T no BB863EE0 VGM n Speakerphone microphone gain 128 121 131 no VGR n Receive gain selection 128 121 131 no VGS n Speakerphone speaker gain 128 121 131 no Programmer s Guide Intel Confidential 7 56K V 92 Data Fax and Voice Chipset Table 2 5 1S 101 Voice Command Summary Continued VGT n Volume selection 128 121 131 no VIP Initialize parameter no VIT n DTE DCE inactivity timer 0 0 255 no VLS n Relay speaker control 0 0 16 no VNH n Automatic hang up control 0 0 2 no VRA n Ringback goes away timer 50 0 50 no VRN n Ringback never appeared timer 10 0 255 no VRX Record mode none oa no VSD m Silence detection quiet and silence 128 50 See note no VSMaM Compression method selection lsa 8000 0 See note no VSP n Speakerphone on off control 0 0 1 no VSPS n Speakerphone type selection 1 0 1 no VTD n Beep tone duration timer 100 5 255 no VTS m DTMF and tone g
71. de Command Descriptions Continued The following example shows how to read the string HEX VALUE B B 8 6 3 E E 0 secure Mi cotta eA A mn m a m BIT VALUE 1011 1011 1000 0110 0011 1110 1110 0000 EVENT 0123 4567 891011 12131415 16171819 20212223 24252627 28293031 a HEX DIGIT LOCATION 1 2 3 4 5 7 8 Speakerphone Microphone Gain This command sets the speakerphone s mi crophone gain VGM n 128 n 121 131 n 128 Nominal value Receive Gain Selection This command sets the recording level for the mo dem s voice mode A different recording level may be needed for each type of re cording device This includes telephone line local handset local telephone or VGR n 128 microphone n 121 131 n 128 Nominal recording level Speakerphone Speaker Gain This command sets the speakerphone s speaker gain VGS n 128 n etda Default n 128 n 121 Gain smaller than normal n 131 Gain larger than normal Volume Selection This command sets the volume level for the modem s play back voice mode A different playback level may be needed for each type of play 4VGTen 128 back device telephone line local handset local telephone or speaker n 121 131 n 128 Nominal transmit level Programmer s Guide Intel Confidential 87 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descriptions Continued VIP none Initialize Parameter This command causes the modem to initialize all
72. ded with power to detect the hook condition DCE on hook Local phone connected to DCE DCE off hook Local phone connected to Telco DCE con nected to Telco Not implemented Return error Internal speaker connected to DCE DCE on hook Local phone connected to Telco Internal speaker connected to Telco DCE off hook DCE connected to Telco Local phone provided with power to detect hook condition Internal microphone connected to DCE DCE on hook Local phone connected to Telco Internal microphone and internal speaker connected to Telco Squelching active DCE off hook DCE connected to Telco Local phone provided with power to detect hook con dition External speaker connected to DCE DCE on hook Local phone connected to Telco Implemented as 4 Speaker jack determines External speaker connected to Telco DCE off hook DCE connected to Telco Local phone provided with power to detect hook condition Implemented as 5 Speaker jack determines Internal microphone and external speaker connected to Telco Squelching active DCE off hook DCE connected to Telco Local phone provided with power to detect hook con dition Implemented as 7 Speaker jack determines External microphone connected to DCE DCE on hook Local phone connected to Telco Implemented as 6 Mic jack determines External microphone and internal speaker connected to Telco Squelching active DCE off hook DCE connected to Telco Local phone provided wit
73. dem Receiver FIFO Buffer Shift Register DTE Register RBR UART Receiver Flow Diagram Figure 10 1 FIFO Buffers for Transmitter and Receiver The register addresses are divided into two types single register access and multiple register access Most of the UART registers are single register access that is only one internal register is accessible for a given register address UART register addresses 3 7 are used to access a single internal register The remainder of the UART register addresses 0 2 are used to access two or more internal registers Register address 2 is used to write FIFO control information into the FCR FIFO Control register and to read the IIR Interrupt Identity register Register address 1 is used to read and write data to the IER Interrupt Enable register when DLAB 0 and the MS DLM Divisor Latch register when DLAB 1 Register address 0 is used to read data from the RBR Receiver Buffer register when DLAB 0 write data to the THR Transmitter Holding register when DLAB 0 and read and write to the LS DLL Divisor Latch register when DLAB 1 The UART registers and FIFO usage are described in the following sections Programmer s Guide Intel Confidential 119 56K V 92 Data Fax and Voice Chipset in Table 10 1 Parallel Host Interface UART Register Bit Assignments BIT NUMBER REGISTER REGISTER ADDRESS NAME Scratch register Scratch register SCR SCR Delta Trailing
74. detection and enables dial tone detection Enables result codes 0 5 7 and 10 and X3 above enables busy detection and disables dial tone detection x4 Enables result codes 0 7 and 10 and above enables busy and dial tone detection j Yn Long space disconnect 0 0 1 yes YO Disables long space disconnect Y1 Enables long space disconnect Zn Recall stored profile 0 0 1 no ZO Resets modem and recalls user profile O Zi Resets modem and recalls user profile 1 5 amp Cn DCD data carrier detect option 1 0 1 yes amp CO Ignores remote modem status DCD always on amp C1 DCD set according to remote modem status amp Dn DTR data terminal ready option 2 0 3 yes 10 Intel Confidential Programmer s Guide a intel 4 56K V 92 Data Fax and Voice Chipset Table 2 1 Data Mode Command Summary Continued Note Command Function Default Range aoe by amp DO In Async mode modem ignores DTR Modem switches from data mode to com amp D1 mand mode when an on to off transition of DTR occurs When DTR switches off the modem goes on amp D2 hook and disables Auto answer mode when DTR switches on auto answer is enabled amp D3 Turning off DTR re initializes the modem and resets values except UART registers amp F Load factory defaults none no amp Gn Srey tone option 1200 bps and 2400 bps 0 0 2 yes amp GO Disables guard tone amp G1 Enables 550
75. does not apply Use the following format AT VTS lt DTMF or gt lt duration gt For example AT VTS 2 30 This command sends DTMF tone 2 with a duration of 300 ms For example AT VTS 50 This command sends a hook flash with a duration of 500 ms Send multiple DTMF signals and tones by combining elements in a given VTS m command string For example AT VTS 30 1 2 1000 1300 50 6 1000 9 This command line programs the following events Hook flash with a duration of 300 ms Send DTMF 1 for the duration specified by VTD command Send DTMF 2 for the duration specified by VTD command Send tone pair 1000 Hz and 1300 Hz for a duration of 500 ms Hook flash with a duration specified by VTD command Send DTMF for a duration of 60 ms Send tone 1000 Hz for a duration specified by the VTD command Send DTMF 9 for the duration specified by VTD command ONOOaBRWN For example AT VTS 1 50 2 9 This command line programs the following events 1 Send DTMF 1 for the duration specified by VTD command 2 Play silence for a duration of 500 ms 3 Send DTMF 2 for the duration specified by VTD command 4 Play silence for a duration specified by VTD command 5 Send DTMF 9 for the duration specified by VTD command Programmer s Guide Intel Confidential 99 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descri
76. e 1 0 1 yes NO Handshake only at DTE to modem data rate N1 Begins handshake at DTE to modem data rate and falls to highest compatible rate On Go online 0 0 1 no 00 Returns modem to Data mode 01 Retrains equalizer and then returns to Data mode 5 P Select pulse dialing none yes Qn Result code display control 0 0 1 yes QO Enables result codes Programmer s Guide Intel Confidential 9 a 56K V 92 Data Fax and Voice Chipset intel Table 2 1 Data Mode Command Summary Continued R rt Note Command Function Default Range ss Sts By Q1 Disables result codes Sn Select an S register none 0 37 no n 0 37 Sn x Write to an S register none x 0 255 no Sn Read from an S register none 0 33 no g T Select tone dialing none no i Vn Result code form 1 0 1 yes VO Choose numeric form V1 Choose verbose text form Wn Response code data rate 0 0 2 4 yes wo Reports DTE speed response codes W2 Reports DCE speed response codes Reports DTE speed response codes and W3 information on error correction and data com pression Reports protocol data compression and DTE W4 data rate 7 Xn Result code type 4 0 4 yes xO Enables result codes 0 4 disables detection of busy and dial tone x4 Enables result codes 0 5 10 and above dis ables busy and dial tone detection Enables result codes 0 6 and 10 and above X2 disables busy
77. e and the DTE sends a valid AT command The AT commands Bn Nn and MS m and S register 37 define which modem to modem data rates are supported by the modem The following table shows the supported modulation types Each modulation supports one or more data rates Table 3 2 Supported Modulation Types lt carrier gt Description V21 V 21 300 bps v22 V 22 1200 bps V22B V 22 bis 1200 and 2400 bps V23C V 23 with constant carrier 1200 bps forward and 75 bps reverse V32 V 32 4800 and 9600 bps V32B V 32 bis 7200 9600 12 000 and 14 400 bps V34 V 34 asymmetrical connections 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 and 28 800 bps V 34 extended asymmetrical connections 2400 4800 7200 9600 12 000 14 400 V318 16 800 19 200 21 600 24 000 26 400 28 800 31 200 and 33 600 bps V 34 symmetrical only connections 2400 4800 7200 9600 12 000 14 400 16 800 V343 19 200 21 600 24 000 26 400 and 28 800 bps V 34 extended symmetrical connections 2400 4800 7200 9600 12 000 14 400 VS4BS 16 800 19 200 21 600 24 000 26 400 28 800 31 200 and 33 600 bps 56K V 90 asymmetrical connections transmit 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 and 28 800 31 200 and 33 600 bps V30 56K V 90 asymmetrical connections receive 28 000 29 333 30 666 32 000 33 333 34 666 36 000 37 333 38 666 40 000 41 333 42
78. e before the VIT timer times out then the modem immediately aborts record mode The modem then hangs up the line and chang es to data mode FCLASS 0 If the UART DTR signal is toggled on off on then the modem follows the amp Dn setting If configured for amp D2 or amp D3 the modem im mediately aborts record mode hangs up the line and changes to data mode FCLASS 0 Note The voice sampling rate and sampling mode must be the same values as used during record mode 92 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued VSD m see m Silence Detection Quiet and Silence This command allows the DTE to set two parameters lt sds gt reports the sensitivity for silence detection and lt sdi gt re ports the length of silence required for the DCE to report silence when receiving voice The lt DLE gt lt s gt silence timer starts immediately after entering record mode The modem stops using the lt DLE gt lt s gt timer and starts using the lt DLE gt lt q gt timer if e the lt DLE gt lt s gt silence timer has timed out and a lt DLE gt lt s gt code has been sent to the DTE or e if noise or voice energy has been detected above the silence detection threshold as defined by lt sds gt m lt sds gt lt sdi gt Defaults m 128 50 lt sds gt Silence Sensitivi
79. econds AT C1DT 123 Causes the modem to dial the telephone number 123 and immediately start sending a data calling tone Calling tone can then be detected by the remote voice mail system After detecting the calling tone the remote system can change to data mode and start the data modem connection handshake Programmer s Guide Intel Confidential 27 a 56K V 92 Data Fax and Voice Chipset intel 28 Note 3 6 Online Command Mode Escape Codes On After establishing a connection with a remote modem the DTE sends the appropriate escape sequence to the DCE which causes the DCE to enter the online command mode The online command mode is used to send AT commands to the DCE while the DCE is still connected to the remote modem The supported escape sequences are described in Section 3 10 To re enter the online data mode use the ATOn command Example 1 second Hayes Escape Sequence Guard times in which the DTE does not send data to 1 second the DCE of 1 second are needed before and after the three escape characters AT lt CR gt TIES Time Independent Escape Sequence ATO Causes the modem to re enter online data mode 3 7 Hanging Up Hn S10 Zn amp D2 A modem connection terminates when the modem hangs up or when the remote modem transmit carrier is off longer than the duration specified in S register S10 To hang up the DTE typically sends an escape code sequence that causes the DCE to enter online co
80. ed HDLC Frame Information AT FTH lt mod gt Facsimile Facsimile Frame Address Control Checking Control Information Field Field Sequence Field Field FCS Figure 5 3 CLASS 1 DTE Reception of HDLC Frame Information AT FRH lt mod gt Like the data modem mode the DTE needs to issue an ATD string or ATA command to the modem to originate or answer a fax call Unlike the data modem mode auto answering is not supported by the modem while in fax mode It is recommended that S register SO be set to 0 that is use ATA whenever the modem is expected to receive a fax call The ATDT lt telephone number gt command string causes the modem to originate a fax call After dialing the telephone number the modem sends out a calling tone 1100 Hz recognizes the remote fax modem answer tone and looks for the remote fax HDLC flags at 300 bps If the HDLC flags are detected the modem sends the DTE a CONNECT message followed by the Class 1 HDLC frame information If the HDLC flags are not detected within the time limit defined by S register S7 the modem sends a NO CARRIER message to the DTE and then hangs up the line If the modem hangs up the line while processing the ATD command that is while the modem is on hook the modem responds back with an ERROR message whenever the DTE issues one of the data stream AT commands The ATA command causes the modem to answer a fax call After going off hook the modem s
81. ends the answer tone followed by HDLC flags The modem then sends a CONNECT message to the DTE and waits to receive the HDLC frame information from the DTE In general the ATA command performs three functions 1 It places the modem off hook 2 It causes the modem to transmit the answer tone 3 It causes the modem to act as if it received an AT FTH 3 command from the DTE Programmer s Guide Intel Confidential 75 a 56K V 92 Data Fax and Voice Chipset intel Table 5 3 Note Command The following data mode and voice mode AT commands are supported in fax mode Data All Voice FCLASS Fax Mode Command Descriptions An asterisk denotes the factory default setting Default FCLASS 1 0 Description Fax Mode Selection This command is used to select a fax class indicate current fax class mode setting and indicate supported fax classes All fax mode com mands except for FCLASS are valid only in fax mode FCLASS Indicates current fax class selection FCLASS Indicates supported fax classes FCLASS n Configures DCE for selected fax class The modem responds back with an OK message at the same DTE to modem data rate used to issue this command n 0 1 8 n 0 Configures DCE for data modem operation n 1 Configures DCE for fax Class 1 modem operation n 8 Configures DCE for IS 101 voice mode FRH n none Receive HDLC Data The FRH lt mod gt command causes the modem t
82. eneration none See note no VTX Play mode none 7 no NOTE See the complete command description in the MD566X Programmer s Guide for range information The noted parameters commands and responses depend on the capability to receive Table 2 6 Voice DTE DCE Character Pairs Response Hex Code Function lt NUL gt 00 Do nothing lt DLE gt 10 Two contiguous lt DLE gt lt DLE gt codes indicate a single lt DLE gt in the data stream lt SUB gt 1A lt DLE gt lt DLE gt in data stream lt ETX gt 03 End transmit data state 2F Start of DTMF tone shielding lt DEL gt 7F DTMF transition to off u 75 Bump up the volume d 64 Bump down the volume lt ESC gt 1B End receive data state 21 Receive data abort lt CAN gt 18 Clear transmit buffer of voice data 3F Transmit buffer space available query 18 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 2 7 Voice DTE DCE Character Pairs Response Hex Code Function lt DLE gt 10 Single lt DLE gt character in the data stream lt SUB gt 1A lt DLE gt lt DLE gt in data stream lt ETX gt 3 End of Record mode data X 58 Packet header for Complex Event Detection Report 2E Packet terminator for the Complex Event Detection Report 2F Start of DTMF tone shielding lt DEL gt 7F DTMF transition to off 0 9 30 39 DTMF tones 0 9 A D 41 44 DTMF ton
83. ential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset 10 1 UART Register Definitions 10 1 1 Scratch Register SCR Register 7 SCR This is an 8 bit read write register used by the DTE for temporary storage of data 10 1 2 Modem Status Register MSR This register provides four bits bits 7 4 that show current modem state and four bits bits 3 0 that provide modem change information Bits 3 0 are set to 1 whenever the control information changes state These bits are reset to 0 whenever the DTE reads the MSR register If the modem status interrupt is enabled IER3 the modem generates an interrupt on the uP HINT pin whenever MSR bits 3 0 are set to 1 Bit 7 Data Carrier Detect DCD When this bit is set to 1 it indicates that the remote modem data carrier has been detected refer to the amp C command Bit 6 Ring Indicate RI This bit indicates when a ring signal has been detected Data Set Ready DSR This bit indicates when the modem is ready to establish a communication link Bit 5 When entering voice mode DSR is set to 1 DSR is used for voice playback record DMA mode to indicate when the DTE has not responded to a modem DMA data transfer request DSR is set to 1 when DMA data are being transferred DSR is set to 0 when a new DMA transfer has not occurred with 1 7 ms after the pre vious DMA transfer DSR works similarly to a DMA terminal count
84. eport gt parameter should be set to a value larg er than the expected off times within a single pattern so the RING even reports are issued only during the off times between the complex patterns Range lt report gt 0 255 reporting type in the form DROF lt number in units of 0 1 seconds gt lt enable gt lt report gt Function 0 Distinctive ring disabled 1 0 The modem reports DROF and DRON messages but does not report RING messages The modem reports DROF DRON and RING mes sages 2 255 Reserved 1 non O Regardless of its setting the VDR command can be disabled by the VEM com mand VEM m see m Event Reporting and Masking This command selects which detection events are supported in voice mode Each event is represented by a single bit of a four digit hex number see the following table Setting an event number bit to 0 means that event is not reported Setting a bit to 1 indicates that a detected event is re ported While the event settings affect all modes that is playback record and command modes not just voice command mode the mask can be changed each time the mode is changed Not all events are supported in each mode See the following table for supported events This modem supports more features than an IS 101 Class C compliant modem Class C is the highest IS 101 com pliant modem and Class A is the lowest See the following examples for more information m lt mask gt Defaults
85. ers This inter character delay time is set to 1 second An example of the Hayes Escape Sequence follows Format lt gt 1 gt lt charl gt lt tm 2 gt lt char2 gt lt tm3 gt lt char3 gt lt gt4 gt gtl gt4 preceding and following guard times S12 tm2 tm3 lt inter character time out 1 second charl char2 char3 escape character S2 Example DTE 1 second 1 second DCE OK If an AT command string is received while in TIES command mode the modem processes any valid AT command Upon detecting an invalid AT command the modem changes back to data mode and issues a CONNECT message to the DTE While in TIES command mode the modem ignores certain characters that may cause the modem to incorrectly decide that an incoming AT string is invalid The ignore characters are lt LF gt lt space gt and lt CR gt lt CR gt is ignored only when S3 is not equal to lt CR gt Not all AT commands are supported during TIES command mode The following is a list of supported commands En Hn Mn On Qn Sn Vn Xn and amp commands except amp Tn and amp F Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset The escape character is determined by the value stored in S register S2 and it is typically a character The following is an example of the TIES Escape Sequence Format lt charl gt lt char2 gt lt char3 gt lt AT command gt lt contents of S3 gt charl
86. ersists for a shorter time than i the value specified in S25 is ignored by the modem see the amp Dn command Range 0 255 1 100 of a second Bit Mapped Options S27 is a read only register that indicates AT command set tings Bits 3 1 0 000 amp Q0 is selected 001 Reserved 010 Reserved 011 Reserved 100 Reserved 27 64 101 Not used 110 Not used 111 Not used Bits 2 4 5 Reserved Bits 7 6 00 BO is selected 01 B1 is selected 10 B2 is selected 11 B3 is selected 106 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 7 1 S Register Command Descriptions Continued Disconnect Inactivity Timer This S register sets the length of time in minutes that the modem stays online off hook before disconnecting when no data is being transmitted or received In data and fax modes any data transmitted or received be tween the DTE DCE interface resets the timer In all other modes except Tele phone Emulation mode any data transmitted resets the timer In Telephone Emu 30 0 lation mode S30 is ignored that is the modem does not automatically hang up the line after a given time delay Range n 0 255 minutes n 0 Disabled Bit Mapped Options S31 is a read only register that indicates AT command set tings Bit 0 0 NO is selected 1 N1 is selected Bit 1 0 amp UO is selected 1 amp U1 is selected S31 49 Bit 2 Reserved Bit 3 0 C0 is selected 1 C1 is selected Bit 4 0 E0
87. es A D 2A DTMF tone 23 DTMF tone o 6F Receive buffer overrun c 63 1100 Hz fax calling tone e 65 1300 Hz data calling tone h 68 Local phone goes on hook H 48 Local phone goes off hook S 73 Presumed hang up silence time out q 71 Presumed end of message quiet time out l 6C Loop current interruption L 4C Loop current polarity reversal r 72 Ringback b 62 Busy reorder fast busy d 64 Dial tone detected u 75 Transmit buffer under run p 70 Line voltage increase extension phone goes on hook P 50 Line voltage decrease extension phone goes off hook a 61 Fax or data answer tone 2100 Hz f 66 Data answer detected 2225 Hz R 52 Incoming ring a A 27 Manufacturer specified Programmer s Guide Intel Confidential 19 56K V 92 Data Fax and Voice Chipset tel Table 2 8 Dial Modifiers Command Function 0to9 Dialing digits A B C D Tone dial characters P Pulse dial R Reverse Originate mode S n Dial NVRAM telephone number T Tone dial WwW Wait for dial tone Pause Flash hook Wait for quiet answer Return to command state Ignored by modem L Redial last number Note The manufacturing only S registers S91 and S92 are listed in the Manufacturing Only Commands in Table 2 13 on page 23 Value saved in NVRAM Table 2 9 S Register Summary Note Register Function Default Range Units ae i
88. es to transmit NULLs until the DTE sends more data or 5 seconds have elapsed After 5 seconds have elapsed with an emp ty transmit buffer the DCE turns off the transmit carrier returns to command state and returns an ERROR result code to the modem Note Hex 00 replication does not provide the required timing needed for generating the TCF frame 1 5 seconds of 0 s If the modem s transmit buffer empties and the last transmitted character was not a NULL the modem turns off the transmit carrier returns to command state and sends the OK result code to the DTE Note If the modem is on hook the modem always returns an ERROR message to the DTE after receiving the FTM lt mod gt command Range lt mod gt 24 48 72 73 74 96 97 98 121 122 145 146 Refer to Table 5 2 on page 74 FTS n none Stop Transmission and Pause The FTS lt TIME gt command causes the mo dem to stop all transmissions The modem waits for the specified amount of time then sends an OK result code to the DTE The value lt TIME gt is in 10 ms inter vals Range lt TIME gt 0 255 in 10 ms intervals Programmer s Guide Intel Confidential 79 a 56K V 92 Data Fax and Voice Chipset intel 80 Note 6 IS 101 VOICE MODE AT COMMANDS The 56K FastPath chipsets implement a voice mode AT command set that allows a DTE to record and play back voice messages In addition to this programmer
89. f the modem receives an A or a it stores any additional data received from the DTE in the modem s internal command buffer and continues to send the data to the remote modem The modem then waits until the DTE sends a lt CR gt or up to 39 data characters before deciding whether to go to command mode or to return to data mode Upon detecting a lt CR gt or receiving the 39 data char acters the modem determines if a valid AT command has been received If a non AT command string or an invalid command string has been received then the modem changes back to data mode and sends a CONNECT message to the DTE If a valid AT command has been received the modem changes to Programmer s Guide Intel Confidential 39 a 56K V 92 Data Fax and Voice Chipset intel 40 command mode and sends an OK message After sending the OK message the modem echoes any received data from the DTE while in command mode 2 An A or a is received from the DTE The modem disables the EPD timer and sends the character to the remote modem The modem then stores any received data from the DTE into the modem internal command buffer and sends the data to the remote modem Upon detecting a lt CR gt or receiving up to 39 data characters the modem determines if a valid AT command has been received if so it processes the valid commands If a non AT command string or an invalid command string has been received then the modem rema
90. fers a modem to modem data rate of 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 and 33 600 bps For V 42 MNP and Buffer Normal modes the modem provides speed buffering see Chapter 4 starting on page 63 which Programmer s Guide Intel Confidential 29 a 56K V 92 Data Fax and Voice Chipset intel allows the DTE to modem data rate to be different from the modem to modem data rate Users can take advantage of this feature by setting the DTE to modem rate to a high speed like 115 200 bps and letting the modem negotiate the best line rate The MD566X chipsets can be configured by the MS m command to support either asymmetrical or symmetrical connections The modem transmits and receives at the same speed in symmetrical connections and at different speeds in asymmetrical mode V 90 and V 92 connections are always asymmetrical V 34 mode connections can be either symmetrical or asymmetrical Note that the transmitter speed and receiver speeds typically are different for most V 34 connections over the PSTN 30 Intel Confidential Programmer s Guide in 56K V 92 Data Fax and Voice Chipset Modem on Hold Incoming Voice Call in Data Mode Enable MOH PMH 0 PCW 0 Enable Caller ID Optional VCID 1 Incoming Call gt HW Ring Indication AT Accept or Accept Call Request to go on hold Reject Call PMHR
91. g twos complement signed numbers lt cmlI gt 1 LIN2 16 bit Linear PCM sampling using unsigned numbers lt cml gt 2 AD4 4 bit Adaptive differential pulse code modulation lt cml gt 128 LIN1 8 bit Linear PCM pulse code modulation sampling using twos complement signed numbers lt cml gt 129 LIN2 16 bit Linear PCM sampling using unsigned numbers lt cml gt 132 AD4 4 bit Adaptive differential pulse code modulation lt cml gt 140 CL1 8 bit Intel A law lt cml gt 141 AD 3 bit Adaptive differential pulse code modulation lt vsr gt Sampling Rate This parameter selects the DCE voice sampling digitiz ing rate for the voice signal The supported sampling rates are dependent on the compression schemes used Use the VSM command to obtain supported sampling rates Range lt vsr gt 4800 7200 8000 and 11025 samples second Default lt vsr gt 8000 lt vsr gt samples second 4800 Default used by previous legacy modems 7200 8000 Used by some bulletin boards 9600 11025 Used by many Windows WAV files Comments lt scs gt Silence Sensitivity The function of this parameter depends on whether the DTE is transmitting or receiving in voice mode The DTE can modify the si lence expansion using the lt sel gt parameter When transmitting voice a non zero value of this parameter informs the DCE that the data stream was recorded with silence compression 94 Intel Confidential Programmer s
92. g the ATSn x command changing the contents of the S register does not normally configure the entire modem Reserved S registers are used by the modem and provide no valuable information to the DTE These registers have been removed from the following table Reserved S registers should never be written to as they cause the modem to lock up S Register Command Descriptions An asterisk denotes the factory default setting Default Description So Number of Rings to Auto Answer On Assigning SO a value from 1 to 255 config ures the modem for auto answer mode The modem automatically goes off hook and initiates a data mode answer mode handshake after detecting the specified number of rings This S register is meant for data modem mode only and should be set to 0 for fax and voice modes Range 0 255 rings n 0 Auto answer mode disabled n 1 255 Auto answer mode enabled NOTES 1 If Caller ID is enabled VCID n then the modem only answers after the sec ond ring even if S0 1 2 Setting n gt 2 causes the modem to answer on the n ring signal S1 Ring Count Reports the number of ring signals detected by the modem This reg ister is cleared to zero if no new ring signals are detected within an 8 second time 0 interval Range 0 255 rings Default 0 rings S2 Escape Character S2 specifies an ASCII value for the Hayes or TIES escape char acter The factory default is or ASCII decimal 43 The
93. h power to detect hook con dition Implemented as 7 Mic jack determines External microphone and external speaker connected to Telco Squelching active DCE off hook DCE connected to Telco Local phone provided with power to detect hook con dition implemented as 7 Handset or headset connected to DCE DCE on hook Local phone connected to Telco Handset or headset connected to Telco DCE off hook DCE connected to Telco Local phone provided with power to detect hook condition Handset or headset connected to Telco with microphone muted DCE off hook DCE connected to Telco Local phone provided with power to detect hook condition Programmer s Guide Intel Confidential 89 a K V 92 Data Fax and Voice Chipset 56 9 X ip ntel Table 6 1 Voice Mode Command Descriptions Continued Relay Playback Control cont Voice I O Primitive Codes Primitive Code Description L Local phone T Telco line MO Internal microphone M1 External microphone VLS n 0 So Internal speaker requires squelch on any microphone activ cont ity St External speaker requires squelch on any microphone activ ity HO External microphone and speaker combination handset or headset Note For speakerphone applications see ATI10 VSP and Speakerphone AT Command Requirements in the Voice Application Note for more details Automatic Hang Up Control This command changes the way the modem re sponds to hang up comma
94. ided below 10 2 1 FIFO Interrupt Mode Operation Both the modem receiver and transmitter UART FIFOs can be set up for interrupt mode operation The RCVR FIFO trigger level and character time out interrupts have the same priority as the current received data available interrupt The XMIT FIFO empty interrupt has the same priority as the Transmitter Holding register empty interrupt Information pertaining to using the receiver and transmitter FIFO interrupts is provided below 1 When both the receiver FIFO and the receiver interrupts are enabled FCRO 1 IERO 1 the UART initiates RCVR interrupts under the following conditions a The receive data available interrupt IIR 04 is issued to the DTE when the FIFO has reached its pro grammed trigger level the interrupt clears as soon as the FIFO drops below the programmed trigger level Programmer s Guide Intel Confidential 127 a 56K V 92 Data Fax and Voice Chipset p intel b The data ready bit DR LSRO is set as soon as a character is transferred from the Internal Shift register to the RCVR FIFO DR is reset when the FIFO is empty 2 When the RCVR FIFO and receiver interrupts are enabled the UART initiates a RCVR FIFO time out interrupt under the following conditions a A RCVR FIFO time out occurs when At least one character is in the FIFO The most recent serial character received was longer than four continuous character times ago The most recent DTE
95. in Table 2 13 on page 23 Val lue saved in NVRAM Table 2 10 V 90 V 92 Mode DCE to ISP Response Codes Verbose Code Numeric Code CONNECT 33333 33 CONNECT 37333 34 CONNECT 41333 35 CONNECT 42667 36 CONNECT 44000 37 CONNECT 45333 38 CONNECT 46667 39 CONNECT 48000 42 CONNECT 49333 43 CONNECT 50667 53 CONNECT 52000 54 CONNECT 53333 55 CONNECT 54666 56 CONNECT 56000 57 CONNECT DTE protocol data compression TX DCE transmit data rate RX DCE receive data rate See Note following Table 2 12 on page 23 Intel Confidential 21 56K V 92 Data Fax and Voice Chipset 22 Table 2 11 V 34 Mode DCE to DCE Response Codes intel Verbose Code Numeric Code CONNECT 2400 10 CONNECT 4800 11 CONNECT 7200 24 CONNECT 9600 12 CONNECT 12000 25 CONNECT 14400 13 CONNECT 16800 59 CONNECT 19200 14 CONNECT 21600 61 CONNECT 24000 62 CONNECT 26400 63 CONNECT 28800 64 CONNECT 31200 65 CONNECT 33600 66 CONNECT DTE protocol data compression TX DCE transmit See Note following data rate RX DCE receive data rate Table 2 12 on page 23 Table 2 12 DTE to DCE Data Rate Response Codes Verbose Code Numeric Code OK 0 CONNECT 1 RING 2 NO CARRIER 3 ERROR 4 NO DIAL TONE 6 BUSY 7 NO ANSWER 8 CONNECT 1200 5 CONNECT 2400 10 CONNECT 4800 11 CONN
96. ing This bit indicates when a modem interrupt is pending Whenever this bit is equal to 0 then one or more interrupts are pending Whenever this bit is equal to 1 then no interrupts are pend ing When an interrupt has occurred the host can determine the cause of the interrupt by looking at the IIR interrupt ID bits O and 1 and interrupt ID bit 2 for FIFO mode Bit 0 10 1 8 Interrupt Enable Register IER DLAB 0 This register is used to enable up to five types of UART interrupts receiver line status received data available character time out indication FIFO mode only Transmitter Holding register empty and modem status Each enabled interrupt can individually cause an interrupt to host on the uP HINT output pin To cause an interrupt to the host HINT both the interrupt enable bit and OUT2 MCR2 must be set to 1 Bits 7 4 Not used These bits are permanently set to 0 Bit 3 MSIE Modem Status Interrupt Enabled when set to 1 this bit enables the modem status interrupt Bit 2 RLSIE Receiver Line Status Interrupt Enabled when set to 1 this bit enables the receiver line sta tus interrupt THREIE Transmitter Holding Register Empty Interrupt Enabled when set to 1 this bit enables Bit 1 the Transmitter Holding register empty interrupt RDAIE Received Data Available Interrupt Enabled when set to 1 Programmer s Guide this bit Bit 0 enables
97. ing off in test or idle modes DSR is off when the carrier is lost amp Tn Data Mode Self Test Command This command is used in data mode ex cept V 90 and V 92 modes to initiate and terminate loopback tests for testing modem to modem and DTE to modem data communication integrity n 0 Terminates test in progress n 1 Local analog loopback n 8 Local analog loopback with self test amp Un Disable Trellis Coding This command selects whether the modem transmits or re ceives modulated 9600 bps carrier with QAM or Trellis encoding for V 32 n 0 Enabled Trellis modulation with QAM modulation as a fallback n 1 Disabled QAM modulation only 52 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued View Active Configuration and Stored Profiles This command causes the modem to display the command and S register information contained in the active user profile and in one of two stored profiles The command amp VO displays the active profile and the stored profile 0 amp V1 displays the active profile and the stored profile 1 The information in the active profile is stored into the user profiles with the amp Wn command amp WO stores the active profile into the stored profile 0 amp W1 the stored profile 1 n 0 Stored profile O n 1 Stored profile 1 AT amp VO ACTIVE PROFILE B1 E1 L2 M1 N1 P QO V
98. ins in data mode If a valid AT command has been received then the modem changes to command mode and sends an OK message After sending this the modem while in command mode echoes back any data received from the DTE 3 Any character except an A or a is received from the DTE The modem disables the EPD timer and changes back to data mode 3 10 2 Hayes Escape Sequence In this escape sequence implemented with the DTE sends the modem an escape character three times preceded and followed by guard times Upon detecting the escape sequence the modem sends an OK response to the DTE To re enter the online data state the DTE then sends the modem ATO followed by the contents of S register S3 typically a lt CR gt The escape character is determined by the value stored in S register S2 and is typically a character Guard times are silence times when the DTE does not send any data to the modem Guard times ensure that the modem does not falsely detect an escape sequence if three consecutive escape characters are received from the DTE The preceding and following guard times are defined in S register 12 Typically these guard times are 1 second In addition to the preceding and ending guard times there are inter character time outs between each escape character sent The inter character time outs define the maximum amount of time allowed between characters before the modem ignores the previous escape charact
99. intel Programmer s Guide MD566X July 2001 MD566X 56K Data Fax and Voice Chipset n Revision History Date Revision May 2001 Revise layout July 2001 Update for V 92 Information in this document is provided in connection with Intel products No license express or implied by estoppel or otherwise to any intellectual property rights is granted by this document Except as provided in Intel s Terms and Conditions of Sale for such products Intel assumes no liability whatsoever and Intel disclaims any express or implied warranty relating to sale and or use of Intel products including liability or warranties relating to fitness for a particular purpose merchantability or infringement of any patent copyright or other intellectual property right Intel products are not intended for use in medical life saving or life sustaining applications Intel is a trademark or registered trademark of Intel Corporation or its subsidiaries in the United States Intel may make changes to specifications and product descriptions at any time without notice Designers must not rely on the absence or characteristics of any features or instructions marked reserved or undefined Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them The MD566X may contain design defects or errors known as errata which may cause the
100. iod of silence to the remote modem before disconnecting Yn n 0 Disables long space disconnect n 1 Enables long space disconnect The modem disconnects after re ceiving 1 6 seconds of silence from the remote modem Additional ly after receiving an ATHO command the modem sends at least 4 seconds of silence before hanging up Reset Modem Recall Stored Profile This command causes the modem to go on hook hang up perform a warm reset and load user configuration profile n previously stored in the NVRAM into the active profile The Zn Zn command must be the last command in command string as it causes all sub sequent commands to be ignored n 0 Resets the modem and recalls user profile O n 1 Resets the modem and recalls user profile 1 DCD Data Carrier Detect Option This command controls how the modem functions in relation to the DCD or RLSD signal amp Cn n 0 State of carrier from remote modem is ignored DCD is always on n 1 State of carrier from remote modem is tracked DCD reflects the state of the received carrier 50 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued amp Dn 2 DTR Data Terminal Ready Option This command controls how the mo dem responds to DTR After toggling DTR the host should wait 200 ms be fore modifying the UART registers or sending a new command to the mo dem This is done because the modem doe
101. ion and uses this information to bypass parts of the training sequence As a result this provides faster connections Normal V 90 connections take about 25 30 seconds With V 92 Quick Connect your connect times can be up to 50 faster Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset The V 92 Quick Connect feature is controlled by the PSS and PQC commands The PQC command enables and disables the shorten phase 1 and or phase 2 startup procedures The PSS command forces either a short or full startup procedure on the next and subsequent connections To enable the modem for V 92 Quick Connect set PSS 0 or 1 and PQC 0 Refer to Table 3 4 for the detailed description of these commands The Modem on Hold MOH feature allows you to receive an incoming voice call and stay connected to the Internet and then return online after your conversation without having to redial This is very convenient where the same phone line is used for voice calls and data connections To receive an incoming call as described above requires that you have the Call Waiting service from your telephone company In addition the Caller ID service from your telephone company is recommended but not required for MOH This feature allows you to determine who is calling The hold time for your incoming call is define by your service provide The MOH feature also allows you put you data connection on hold and initiate a voice call and then return on
102. ion information Table 5 1 Fax Identity Command Descriptions Command Default Description Identifies Modem Manufacturer This command causes the DCE to send a message to the DTE indicating the DCE manufacturer This command is identi cal to AT GMI AT FMFR FMFR FMI none Intel Corporation OK Note The DTE manufacturer name can be changed with the firmware configuration utility Identifies Product Model This command causes the DCE to report the mo dem chipset name This command is identical to ATI3 and AT GMM AT FMDL FMDL FMM none MD56xx OK The modem responds with MD566 for all chipsets that support V 42 MNP pro tocols 72 Intel Confidential Programmer s Guide a intel 56K V 92 Data Fax and Voice Chipset Table 5 1 Fax Identity Command Descriptions Identifies Product Version Number This command causes the DCE to report the modem chipset revision level This command is identical to ATI1 and AT GMR FREV FMR none AT FREV CD08 55 612 10 19 99 PARALLEL SPEAKERPHONE 05 OK 5 2 Fax Class 1 Commands The fax Class 1 AT commands are divided into three types class selection and capabilities data stream transfers and silence time timers All fax mode commands except the silence time timers must be the last command on the command line Each command may be used as follows F lt command gt Reads current setting F lt command gt Read
103. is control controls the global enabling or dis abling of the V 92 shortened Phase 1 and Phase 2 startup procedures not the initi ation thereof This command is used in conjunction with the PSS command PQC M 0 m 0 Enable Short Phase 1 and Short Phase 2 m 1 Enable Short Phase 1 m 2 Enable Short Phase 2 m 3 Disable short Phase 1 and Short Phase 2 60 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued Use Short Sequence This command causes a calling DCE to force either a V 92 short or full startup sequence as defined by the PQC command on the next and subsequent connections m 0 The DCEs decide whether or not to use the short startup proce dures The short startup procedures shall only be used if enabled PSS m 2 by the PQC command m 1 Forces the use of the short startup procedures on the next and sub sequent connections if they are enabled by the PQC command m 2 Forces the use of the full startup procedures on the next and subse quent connections independent of the setting of the PQC com mand a Current download speeds are limited to 53 333 bps due to FCC rules that restrict modem power output Programmer s Guide Intel Confidential 61 56K V 92 Data Fax and Voice Chipset 62 Notes Intel Confidential Programmer s Guide In tel 56K V 92 Data Fax and Voice Chipset 4 ERROR CORRECTION AND DATA COM
104. it is transmitted and checked as a logic 0 When configured for stick parity SPAR 1 odd parity EPS 0 and parity enable PEN 1 are set to 1 then the parity bit is transmitted and checked as a logic 1 EPS Even Parity Select When even parity select LCR4 and parity enable LCR3 are set to 1 an even Bit 4 number of logic 1 s are transmitted or checked When even parity select LCR4 is a 0 and parity enable LCR3 is a 1 an odd number of logic 1 s are transmitted or checked PEN Parity Enable When this bit is set to 1 a parity bit is generated transmitted data or checked Bit 3 receive data between the last data character word bit and stop bit of the serial data NOTE The parity bit is used to produce an even or odd number of 1 s when the data word bits and the parity bits are summed Programmer s Guide Intel Confidential 123 a 56K V 92 Data Fax and Voice Chipset x and Voice Chip intel Number of Stop Bits STB This bit specifies the number of stop bits transmitted and received in each serial character When STB is set to 0 one stop bit is generated for each transmitted data character When Bit 2 STB is set to 1 and the word length WLS1 and WLSO is equal to 6 7 or 8 bits then two stop bits are gen erated for each transmitted data character When STB is set to 1 and the word length WLS1 and WLSO is equal to 5 bits
105. l hardware flow control uses RTS CTS to stop and start data from the modem n 0 Disables flow control n 3 Bidirectional hardware flow control RTS CTS n 4 XON XOFF software flow control amp MO 0 Select Communication Mode This command controls whether the modem operates in asynchronous or synchronous mode This modem only supports asynchronous mode This command is the same as amp Q0 n 0 Asynchronous normal The modem operates asynchronously in both command and online modes Programmer s Guide Intel Confidential 51 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued amp Pn Dial Pulse Ratio This command determines the make break that is off hook on hook ratio during pulse dialing n 0 Make 39 Break 61 at 10 pulses per second for use in the United States n 1 Make 33 Break 67 at 10 pulses per second for use in the United Kingdom and Hong Kong amp Q0 Select Communication Mode This command controls whether the modem is operating in asynchronous or synchronous mode This modem only sup ports asynchronous mode This command is the same as amp MO n 0 Asynchronous normal The modem operates asynchronously in both command and online modes amp Sn DSR Data Set Ready Option This command controls how the modem treats the DSR signal n 0 DSR circuit always on n 1 DSR circuit is on during handshak
106. layback mode immediately in two other situations during a AT VIT n time out or a DTR toggle The modem immediately aborts playback mode if VIT 0 and the modem has not received any data or if the modem receives a lt DLE gt lt NUL gt code before the VIT timer time out The modem then hangs up the line and switches to data mode FCLASS 0 If the UART DTR signal is toggled from on off on then the modem follows the amp Dn setting If configured for amp D2 or amp D3 then the modem immediately aborts playback mode hangs up the line and switches to data mode FCLASS 0 Note The voice sampling rate and sampling mode must be the same values used during record mode 100 Intel Confidential Programmer s Guide Table 7 1 Note Command 56K V 92 Data Fax and Voice Chipset 7 S REGISTERS The MD566X chipsets provide direct access to the internal registers known as S registers The DTE uses S registers to set up and check modem configurations The contents of these registers can be changed using the ATSn x command where n is the register number and x is the value to be stored The contents of the S registers can be read using the ATSn command Most S registers can be read from or written to however some S registers such as 14 are read only Writing to a read only register may cause the modem to act improperly that is even though the contents of a read only S register may be changed usin
107. line after completing your voice conversation These two scenarios are described in detail in the modem on hold flow charts The following sequence describes how to configure the modem for MOH to process an incoming voice call while online First MOH must be enabled The PMH and PCW commands are used to enable MOH and to capture the Call Waiting tone which is sent when the voice call comes in To enable MOH set PMH 0 and PCW 0 Next to enable Caller ID information optional by setting VCID 1 Now the modem is configured for the incoming call When you receive the incoming call the modem will get a ring indication and the software application will issue a AT to put the modem in command mode Then you will be prompted to either Accept or Reject the call based on the Caller ID information if enabled If you reject the call an ATO command is issued to perform a Quick Connect to stay online If you accept the call the data connection is put on hold and the modem send ad request to the server to go on hold using the PMHR command The server will accept enable 1 13 returned or reject 0 returned the request If the server accepts the request to go on hold the modem issues the PMHF to flash the hook to connect the call Now you can answer the phone and talk After completing your voice conversation the modem will issue another PMHEF and ATO command to initiate a Quick Connect If the server rejects the request to go on hold the user
108. m or Test Modem AT amp F amp W lt CR gt Returns the modem to the factory de faults AT S18 0 amp T1 Causes the modem to run local analog loopback without self test CONNECT 115200 Modem response code indicates that an alog loopback is enabled with a DTE speed of 115200 This is a test Test string that the user could type at the keyboard If the received data is 36 Intel Confidential Programmer s Guide AT OK AT amp TO OK Programmer s Guide 56K V 92 Data Fax and Voice Chipset the same as the test string then the DTE to modem communication channel is working properly TIES Escape Sequence is used to return to command mode Modem enters command mode Terminates any loopback test Modem aborts analog loopback and stays in command mode Intel Confidential 37 a 56K V 92 Data Fax and Voice Chipset intel 3 9 2 Local Analog Loopback With Self Test AT amp T8 This test is used by the local DTE to check the DTE to modem communication integrity LOCAL MODEM PATTERN GENERATOR PATTERN CHECKER RECEIVER Figure 3 3 Local Analog Loopback with Self Test Local Modem or Test Modem AT amp F amp W lt CR gt Returns the modem to the factory de faults AT S18 20 amp T8 Causes the modem to start local analog loopback with self test for 20 sec onds OK After starting analog loopback the mo dem goes back to command mode AT The modem responds to new c
109. mand specifies whether the modem detects V 42 MNP or no error correcting protocols from the remote mo dem and changes to the appropriate mode Otherwise only V 42 is attempted Jn 1 n 0 1 n 0 Disables the V 42 detect phase n 1 Enables the V 42 detect phase V 42 bis Compression Control This command specifies whether the data in the LAPM frames are compressed using V 42 bis data compression This can improve throughput by as much as 400 Compression can be negotiated to operate in one direction or both Hn 3 n 0 3 n 0 Disables V 42 bis n 1 Enables V 42 bis only when transmitting data n 2 Enables V 42 bis only when receiving data n 3 Enables V 42 bis for both transmitting and receiving data V 42 bis String Length This command specifies the maximum number of charac ters that can be compressed into one V 42 bis code word The default value of 32 On 32 optimizes throughput for most file types n 6 250 Number of characters n 32 Usual number of characters 70 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 4 2 V 44 V 42 V 42 bis and MNP Data Mode Command Descriptions v 44 Data Compression This command controls the V 44 data compression func tion if provided in the DCE It accepts the following subparameters m lt direction gt lt compression_negotiation gt lt capability gt lt max_codewords_tx gt lt m ax_codewords_rx gt lt max_string_tx gt lt max_string_rx gt lt m
110. metal oxide semiconductor DC direct current DAA data access arrangement Programmer s Guide Intel Confidential 3 56K V 92 Data Fax and Voice Chipset Acronyms Acronym Definition Continued DRAM dynamic random access memory EPROM electrically programmable read only memory FIFO first in first out HDLC high level data link control ISA industry standard architecture LSB least significant bit MSB most significant bit NVRAM non volatile random access memory PPP point to point protocol RAM random access memory ROM read only memory R W read write SDLC synchronous data link control SQFP shrink quad flat pack SRAM static random access memory TTL transistor transistor logic UART universal asynchronous receiver transmitter VQFP very tight pitch quad flat pack Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset 1 INTRODUCTION The MD566X Programmer s Guide describes the software interface of Intel s V 90 V 92 56K solution The programmer s guide includes the AT command sets for data fax and voice and the 16C450 16C550A UART emulation The programmer s guide should be used with the following Intel publications the MD566X Datasheet the IS 101 Voice Application Note and the Class 1 Fax Application Note Please note that supported AT commands are firmware revision dependent IMPORTANT The AT commands in thi
111. mmand mode Upon receiving an OK message the DTE sends either ATH or ATZn to the DCE When the AT amp D2 command is used the modem goes on hook hangs up after an on to off transition of the DTR occurs The ATZn command causes the DCE to hang up and re initialize itself to the user profile specified by n 3 8 Modem to Modem Connection Data Rates The data rates differ for each data mode selected V 90 or V 92 is the default data mode depending on the firmware version For non V 90 connections the chipsets fall back to V 34 mode The modem defaults to whatever mode is issued by the MS m command see page 56 The supported modulation types are listed in Table 3 2 on page 33 This table includes all modulation types and the data rates for transmitting and receiving In Data mode the 56K chipsets can transmit up to 48 000 bps V 92 mode or 33 600 bps V 90 mode and receive up to 53 333bps Note that the chipsets are capable of achieving 56 000 bps but power limitations by the FCC limit actual speeds to 53 333 bps The 56K receive data rates can be achieved only in connections with equipment compatible ISPs Internet Service Providers In V 92 mode the MD566X supports 3 new features Quick Connect Modem on Hold and Pulse Code Modulation PCM Upstream The Quick Connect QC feature reduces the time it takes to make a connection to your service provider The modem retains information of the line conditions from your previous connect
112. modem autobauds up to 115 200 bps The modem to modem data rates can be set to 300 1200 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 and 33 600 bps Each operating mode is explained in more detail in the following tables When V 80 mode synchronous access mode for videoconferencing becomes available in the future the ES m commands for data correction compression will supersede the Nn commands Control reverts to the Nn command upon exiting V 80 mode Operating Modes Mode Features Buffer Normal No error correction data compression but speed buffering is sup NO or N1 ported MNP Reliable MNP 2 5 connection only If an MNP connection cannot be estab N2 lished the modem hangs up V 42 Auto Reliable V 42 V 42 bis with fallback to MNP 2 5 or normal mode N3 V 42 Reliable V 42 V 42 bis or MNP 2 5 only connection If a V 42 V 42 bis MNP 2 N4 5 connection cannot be established the modem hangs up Programmer s Guide Intel Confidential 63 56K V 92 Data Fax and Voice Chipset Table 4 1 lists connection types corresponding to Nn settings Table 4 1 Resulting Nn Connection Types Nn Settings Answer Modem Nn Settings NO or N1 N2 N Pane N4 Originate Modem Buffer MNP Reliable reliable V 42 Reliable pera ee ee Modem hangs up ey Modem hangs up ine Roce Modem hangs up MNP 2 5 MNP 2 5 MNP 2 5 v 42 Ar TRTO RI
113. mote modem must answer the MNP link request for the link to be established refer to the U command that follows 68 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 4 2 V 44 V 42 V 42 bis and MNP Data Mode Command Descriptions Qn 3 Set Serial Port Flow Control This command specifies the DTE to modem flow control Software flow control uses the XOFF 13h command to stop and the XON 11h characters to start data transmission both to and from the DTE Unidirectional hardware flow control uses the CTS control line to stop or start data from the DTE only while bidirectional hardware flow control also uses the RTS control to stop or start data from the modem n 0 3 n 0 Disables flow control n 1 XON XOFF software flow control n 2 Unidirectional hardware flow control CTS n 3 Bidirectional hardware flow control RTS CTS Tn 0 Set Inactivity Timer During a buffer normal or reliable connection if no data is sent or received within the inactivity time period the link is disconnected The de fault 0 disables this feature n 0 90 Length in minutes n 0 Disables inactivity timer U none Accept Auto Reliable Link In buffer normal mode NO or N1 the modem at tempts to answer an MNP link request regardless of whether the modem originated or answered the telephone call physical connection The remote modem must orig inate the MNP link request for
114. n none S register n n 0 37 T none Select Tone Dialing This command configures the modem to use DTMF tones the next time the modem dials a telephone number touch tone dialing Result Code Form This command selects whether modem response codes are in numeric or verbose form Vn 1 n 0 Numeric form n 1 Verbose text form 48 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued Response Code Data Rate This command selects whether the modem sends the DTE independent modem connection result codes for speed error control protocol or data compression n 0 CONNECT result code reports DTE speed n 2 CONNECT result code reports DCE speed n 3 CONNECT result code reports DTE data rate modulation mode er ror correction data compression DCE transmitter speed and DCE receiver speed when the mode is configured for verbose V1 text response codes For numeric responses VO the modem responds with the WO numeric response codes The verbose response codes use the following format CONNECT DTE data rate modulation error correction data compression TX DCE transmit data rate RX DTE receive data rate Modulation types include V21 V22 V22B V23C V32 V32B V34 V 90 and V 92 Error correction types include NONE LAPM MNP Wn 0 Data compression types include NONE V42B MNP5 For example CONNECT 115200 V34
115. n 22 Read write general purpose pin 23 NOoOBRWNHO NOTES 1 Default values for VGPO0 VGP2 are dependent on board design 2 These commands should not be used in general purpose application software Programmer s Guide Intel Confidential 117 56K V 92 Data Fax and Voice Chipset 118 Intel Confidential Programmer s Guide In tel 56K V 92 Data Fax and Voice Chipset 10 PARALLEL HOST INTERFACE 16C450 16C550A UART The parallel host interface of the MD566X family emulate the electrical and register functions of a 16550A and 16C450 UART Upon modem reset the modem defaults to a 16C450 The host DTE can then configure the UART to function as a 16C550A UART In 16C450 emulation mode the DTE and modem transfer data back and forth a byte at a time In 16C550A emulation mode the modem provides two 16 byte FIFO buffers one for the transmitter and another for the receiver Thus up to 16 bytes of data may be sent to or received from the modem for each data interrupt instead of only a single byte as in 16C450 mode The following diagram shows how the FIFO is used Host software using this FIFO capability can significantly reduce system overhead by reducing the number of times that interrupt service routines are called UART Modem gt Transmitter Host Transmitter Modem Transmitter FIFO Holding DTE Shift Register Register THR UART Transmitter Flow Diagram Modem UART Receiver Receiver Host f Mo
116. nding an ASCII lt DLE gt character 10h followed by a special character Special characters in the data stream are used as follows any data lt DLE gt lt ETX gt end of data stream 10 03 any data lt DLE gt lt DLE gt single 10 in data stream any data lt DLE gt lt X gt X is a special character delete both lt DLE gt and X from the data stream When the DTE transfers data to the modem during playback mode AT VTX command the DTE must insert a lt DLE gt for each lt DLE gt in the original data stream When data is no longer available the DTE must add the stream terminator lt DLE gt lt ETX gt to the end of the data stream If the modem detects the two terminating characters lt DLE gt lt ETX gt within the data stream it transmits the data immediately to the remote modem without waiting for the buffer to fill up To abort playback mode without waiting for the modem to empty the internal modem buffer send lt DLE gt lt CAN gt lt DLE gt lt ETX gt Immediately aborting the playback mode eliminates long delays between receiving a DTMF tone or keyboard abort and starting a new function such as playing back or recording a new message When the modem transfers data to the DTE during record mode AT VRX command the DTE must filter the data stream by removing all character pairs beginning with lt DLE gt The DTE also must recognize lt DLE gt lt ETX gt as the stream
117. nds after it switches from voice mode to fax or data modes n 0 2 VNH n 0 n 0 The modem retains automatic hang ups as normal in data and fax modes n 1 The modem disables automatic hang ups usually found in non voice modes n 2 The modem disables all automatic hang ups usually found in non voice modes except a logical hang up 90 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued VRA n 50 Ringback Goes Away Timer After originating a call in voice mode this com mand selects the length of time the DCE waits between ringbacks before the DCE assumes the remote party has gone off hook After dialing a phone number and detecting a ringback the modem sends lt DLE gt lt oO gt to the DTE if another ring back is not detected within this timer value This indicates that the remote tele phone has been picked up that is gone off hook The ringback goes away timer is reset every time a new ringback is detected n 0 50 in 100 ms increments n 0 The DCE returns the OK code immediately after ringback n 50 50 5 0 seconds VRN n 10 Ringback Never Appeared Timer This command sets the length of time the DCE waits for ringback when originating a call in voice mode After dialing a phone number the modem sends an Error result code to the DTE if ringback is not detected before the timer value elap
118. ne command mode without initiating a data modem handshake used for phone directory auto dialers Ignored by Modem these four characters are ignored by the modem Spaces also may be included in the dial string to separate area codes and numbers Intel Confidential 43 Redials last number a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued Command Mode Echo This command selects whether the modem echoes AT commands back to the host in either online or off line command mode En n 0 Echo disabled n 1 Echo enabled Online Echo Usually this command selects whether the modem echoes data back to the host during online data mode This chipset does not support Fn online data mode echo n 0 Echo enabled returns an error message n 1 Echo disabled Switch Hook Control This command controls the telephone line relay OHREL and causes the modem to either hang up or pick up the telephone line Hn n 0 Hang up telephone line go on hook n 1 Pick up telephone line go off hook 44 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued Identification Checksum Option This command causes the modem to send product code and hardware setup information to the DTE n 0 Reports product code n 1 Reports firmware version n 2 Verifies ROM checksum n 3 Reports chipset
119. ne AGMT Intel Corporation OK Identify Product Model This command causes the DCE to report the modem chipset name This command is identical to AT FMDL and AT FMM commands GMM none AT GMM MD56xx OK Identify Product Revision This command causes the DCE to report the modem chipset revision level This command is identical to AT FREV and AT FMR GMR none AT GMR CD08 55 612 10 19 99 PARALLEL SPEAKERPHONE 05 OK Programmer s Guide Intel Confidential 55 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued MS m see m Modulation Selection This command sets the type of modulation used and the send and receive speeds Settings for Bn MS m Nn and S37 determine the al lowable modem connections Nn performs the same function as the MS m lt auto mode gt parameter S37 performs the same function as the MS m lt max rate gt pa rameter Modems using MD566X chipsets can be configured by the MS m command to support only asymmetrical or symmetrical connections The transmit and receive speeds are the same in symmetrical connections and different in asymmetrical con nections The type of connection is set by the lt carrier gt parameter The chipsets default to the ITU T V 90 or V 92 mode depending on firmware version If the con nection is non V 90 V 92 the chipsets fall back to V 34 mode Note that the transmit ter speed and receiver speeds t
120. nfigure V 17 12000bps long train n 4a FAX configure V 17 12000bps short train n 4b FAX configure V 17 14400bps long train n 4c FAX configure V 17 14400bps short train 116 Intel Confidential Programmer s Guide a intel 56K V 92 Data Fax and Voice Chipset Table 9 1 Manufacturing Only Command Descriptions Continued Read Write General Purpose Pins These commands allow the DTE to set the mo dem signal level at the general purpose input output pins GPIO0 GP1023 to Vcc or ground The AT VGP0 2 commands allow the DTE to readthe signals applied at these pins Command Bit Pins VGPO Read write general purpose pin 0 Read write general purpose pin 1 Read write general purpose pin 2 Read write general purpose pin 3 Read write general purpose pin 4 Read write general purpose pin 5 Read write general purpose pin 6 Read write general purpose pin 7 NOoORWNM O VGP1 Read write general purpose pin 8 Read write general purpose pin 9 Read write general purpose pin 10 Read write general purpose pin 11 Read write general purpose pin 12 Read write general purpose pin 13 Read write general purpose pin 14 Read write general purpose pin 15 VGP0 n VGP1 n See Note 1 VGP2 n NOoORWN O VGP2 Read write general purpose pin 16 Read write general purpose pin 17 Read write general purpose pin 18 Read write general purpose pin 19 Read write general purpose pin 20 Read write general purpose pin 21 Read write general purpose pi
121. ng as there is at least one byte in the RCVR FIFO Unlike FIFO interrupt mode FIFO polled mode does not support buffer trigger levels or time out conditions 128 Intel Confidential Programmer s Guide Programmer s Guide Intel Confidential 56K V 92 Data Fax and Voice Chipset 129 56K V 92 Data Fax and Voice Chipset 130 Intel Confidential Programmer s Guide
122. nge lt automode gt 0 1 Default lt automode gt 1 lt automode gt 0 Disabled lt automode gt 1 Enabled lt min rate gt This parameter specifies the lowest data transfer rate at which the mo dem may establish a carrier signal connection Range lt min rate gt 0 300 1200 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 and 33 600 bps Default lt min rate gt 0 lt min rate gt 0 Minimum allowed data rate lt automode gt 1 Lowest data rate 300 bps lt automode gt 0 Lowest data rate Lowest modulation data rate lt min rate gt 0 Lowest permitted connection rate lt max rate gt This parameter sets the highest speed at which the modem may estab lish a connection This feature is also controlled by the S37 S register The lt max rate gt setting is based on which command 37 or MS m was issued last Programmer s Guide Intel Confidential 57 a 56K V 92 Data Fax and Voice Chipset intel Table 3 4 Data Mode Command Descriptions Continued Modulation Selection cont Range lt max rate gt 0 300 1200 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 33 333 33 600 37 333 41 333 42 666 44 000 45 333 46 666 48 800 49 333 50 666 52 000 53 333 54 6669 and 56 000 bps Default lt max rate gt 0 lt max rate gt 0 Maximum allowed data rate If the ma
123. nore the contents of S6 Range 2 255 seconds Default 2 seconds Wait for Carrier Dial Tone S7 specifies the length of time that the modem waits to detect the remote modem carrier after dialing the telephone number If the remote modem carrier is not detected within the S7 time limit the modem hangs up and sends a NO CARRIER response code to the DTE If the remote modem carrier is detected the modem goes into online data mode and sends a CONNECT mes S7 60 sage to the DTE S7 also specifies the time duration for the wait for quiet answer dial modifier Range 1 255 seconds Default 60 seconds Pause Time for Dial Modifier S8 specifies the length of time that the modem paus es during the dialing process each time the dial modifier is detected in the dialing s8 2 string Range 0 255 seconds Default 2 seconds 102 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 7 1 S Register Command Descriptions Continued Carrier Detect Recovery Time S9 specifies how long the remote modem carrier must be present on the telephone line before the modem detects it and turns on DCD The greater the time duration the less likely that a false carrier detection oc S9 6 curs due to noise on the telephone line Range 1 255 1 10 of a second Default 6 equals 0 6 seconds Lost Carrier Hang Up Delay For modes V 34 V 90 and V 92 the modem retries the connecti
124. ns S14 is a read only register that indicates AT command set tings Bit 0 Bit 1 0 Bit 2 0 14 138 Bit 3 0 Bit 4 Bit 5 0 Bit 6 Bit 7 0 1 Reserved EO is selected E1 is selected QO is selected Q1 is selected VO is selected V1 is selected Reserved T tone dial is selected P pulse dial is selected Reserved Answer Originate Modem Test Options S16 indicates the test in progress Bit O 0 Local analog loopback disabled 1 Local analog loopback enabled amp T1 Bit 1 Reserved S16 0 Bit 2 5 Reserved Bit 6 0 Analog loopback with self test disabled 1 Analog loopback with self test enabled amp T8 Bit 7 0 Reserved 1 Reserved Modem Test Timer S18 specifies the length of time that the modem conducts a data mode except V 90 and V 92 mode loopback test using the amp Tn command Af ter timing out the modem returns to command mode Setting S18 to 0 disables the S18 0 modem test timer the loopback test must be terminated by issuing the appropriate escape sequence followed by an AT amp TO or ATH Range 0 255 seconds Default 0 seconds 104 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 7 1 S Register Command Descriptions Continued Bit Mapped Options S21 is a read only register that indicates AT command set tings Bit O Reserved Bit 1 Reserved Bit 2 Reserved Bits 4 3 00 amp DO is selected 01 amp D1 is selected S21 48 10
125. o re ceive HDLC framed data using the modulation mode selected in lt mod gt The mo dem then delivers the next received frame to the DTE If the modem detects the selected carrier signal with an HDLC flag the modem sends a CONNECT result code to the DTE If the modem detects a different sig nal the modem sends the FCERROR fax connect error result code to the DTE and returns to command mode Upon loss of carrier the modem returns to command mode and sends a NO CARRIER result code to the DTE After receiving the HDLC flags the modem strips away the flags and buffers the received frames The modem then transfers the received data to the DTE starting with the first non flag byte and continuing through the last FCS byte The DTE should ignore the value of the FCS bytes The modem also performs HDLC zero bit deletion and error checking After the FCS bytes are transferred the modem marks the end of the frame with lt DLE gt lt ETX gt and reports the status of the frame reception to the DTE If the frame was received correctly FCS is correct the modem returns a OK result code If the frame was received in error FCS is not correct carrier lost or data lost due to data overflow the DCE returns an ERROR result code The DTE should then discard this frame After sending the status result code the modem is ready to accept new com mands from the DTE 76 Intel Confidential Programmer s
126. ode upon receipt of auto reliable fallback character and passes it to serial port This feature allows non V 42 modems to connect immediately to a V 42 modem without data loss Set Modem Port Flow Control In buffer normal mode either NO or after fall back this command enables modem to modem flow control using XOFF 13h to stop and XON 11h to start transmission between modems Gn 0 n 0 1 n 0 Disables port flow control n 1 Sets port flow control to XON XOFF bps Rate Adjust Control If this command is enabled the serial port speed auto matically changes to the modem connection speed This forces the user to change the DTE to modem bps rate if needed If the command is disabled the serial port speed is independent of the connection speed which allows much greater through Jn 0 put when using error correction and data compression n O 1 n 0 Turns off feature n 1 Turns on feature Programmer s Guide Intel Confidential 67 56K V 92 Data Fax and Voice Chipset intel Table 4 2 V 44 V 42 V 42 bis and MNP Data Mode Command Descriptions Set Break Control Defines what action the modem takes when a break attention signal is sent or received as described below n 0 5 In connect state transmits break to remote if in reliable mode n 0 2 4 Enter command state but does not send a break n 1 Destructive expedited n 3 Nondestructive expedited n 5 Nondestructive non expedited In command state transmits
127. om a packet of data items data or fax command mode RING DATE 0321 TIME 1405 NMBR 5045551234 NAME DOE JOHN 060342424231 Example 2 The following example illustrates the unsolicited response AT VCID 1 form of voice mode voice command playback and record modes lt DLE gt R lt DLE gt X DATE 0321 ME 1405 NMBR 5045551234 NAME DOE JOHN MESG 060342424231 Example 3 The following example of formatted form reporting illustrates the case when the DCE does not recognize the tag of the packet data or fax command mode RI M R R NG ESG 060342424231 NG NG For unformatted form reporting AT VCID 2 the DCE presents all information contained in the Caller ID packet as ASCII hex in printable characters This information includes all message type information message length data and checksum Example 4 The following example illustrates unformatted form reporting data or fax command mode RI NG MESG 04123033323131334303539313435353132333435 RI R NG ING Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset 9 MANUFACTURING ONLY COMMANDS The following commands are provided for manufacturing and testing purposes only These commands should not be included in end user literature Caution Serious damage to the controller may occur if these commands
128. ommands OK 000 After 20 seconds the modem stops ana log loopback sends OK An error count to the DTE and enters command mode AT S18 0 amp T8 Causes the modem to start local analog loopback with self test which is only terminated by AT amp TO or ATH OK After starting analog loopback the mo dem goes back to command mode AT The modem responds to new commands OK AT amp TO After receiving AT amp TO or ATH the modem stops analog 000 loopback sends an error count to the DTE and enters 38 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset OK command mode 3 10 AT Escape Sequences The 56K family provides the industry standard Time Independent Escape Sequence TIES The DTE sends the escape sequence to return the modem to command state while in the online data state that is connected to another modem or in diagnostic mode amp Tn commands Intel also makes the Hayes Escape Sequence available to customers however see the following statement regarding licensing requirements Licensing Requirements for Hayes Escape Sequence The Intel 56K FastPath chipsets are manufactured with TIES as the default setting It is Hayes position that you must either have or obtain a valid license from Hayes Microcomputer Products Inc of Norcross Georgia before producing modem systems that use the Hayes Escape Sequence Intel accepts no responsibility and does
129. on for S10 plus some base time before hanging up The base time is 20 seconds in V 34 and 45 seconds in V 90 and V 92 S10 reports the time in 1 10 second units beyond 20 seconds For example when S10 0 the wait time is 20 seconds When S10 100 the wait time is 30 seconds 10 14 In V 34 V 90 and V 92 modes the modem automatically retries the connection for 45 seconds when S10 1 254 For all modes the modem does not disconnect upon loss of the remote modem car rier if S10 is 255 Range 0 255 1 10 of a second Default 14 equals 1 4 seconds DTMF Dialing Speed S11 specifies the duration of dual tone multi frequency DT MF dialing This register is not used for pulse dialing 11 70 Range 50 255 ms Default 70 ms Guard Time S12 is used to specify guard and detect times used for the Hayes and TIES escape sequences For the Hayes Escape Sequence S12 specifies the minimum delay timer or guard time before and after the three escape characters that is required for the modem to detect the Hayes Escape Sequence 12 50 For TIES S12 specifies the maximum time limit that must elapse after receiving the three escape characters and no other characters before sending an OK message to the DTE Range 0 255 1 50 of a second Default 50 equals 1 second Programmer s Guide Intel Confidential 103 56K V 92 Data Fax and Voice Chipset intel Table 7 1 S Register Command Descriptions Continued Bit Mapped Optio
130. one network only in connections with equipment compatible ISPs Internet Service Providers however FCC regulations limit receive speeds to 53 333 kbps due to excessive power demands at higher speeds In modem to modem connections V 90 V 92 mode falls back to the V 34 mode in both the transmit and receive directions 1 2 Modem Connection Overview The DCE modem operates in one of two states command or online In each state both data and commands including DCE responses are transferred through the UART THR Transmit Holding register and the RBR Receiver Buffer register The modem defaults to the command state In the command state the DTE host communicates to the modem through AT commands and S registers AT commands are character strings that help guide modem operation S registers are internal modem registers that the DTE can access The S registers contain modem status and configuration information Many of the AT commands indirectly affect the contents of the S registers The MD566X s AT command set and S registers are divided into the following modes Group 3 fax data V 42 MNP voice See Chapter 2 on page 8 for command table summaries All command lines sent to the modem except for A must be preceded by an AT which stands for attention and terminated by the contents of S register S3 typically a carriage return lt CR gt The AT prompts the modem to receive a command line from the DTE A lt CR gt info
131. phone number use the ATDS n command Use the amp V command to see the amp Zn x none stored telephone number n 0 3 x 0 9ABCD TPRW Auto Retrain Control This command controls whether the modem auto matically initiates a modem retrain whenever the received data signal quality falls below a threshold that may affect data reliability The value for n is En 1 stored in the NVRAM n 0 Disabled n 1 Enabled Rate Renegotiation This command selects whether the modem automatically ini tiates a change to a higher speed or lower speed depending on received signal qual ity that is rate negotiation The modem always responds to any rate change initi Gn 1 ated by the remote modem n 0 Disabled n 1 Enabled 54 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued Generate Data Modem Calling Tone This command allows the DTE to select whether the modem sends a 1300 Hz calling tone or V 8 calling tone when originat ing a data modem connection Cn 0 n 0 Calling tone disabled n 1 1300 Hz calling tone sent for all data modem connections n 2 V 8 calling tone sent for V 34 modulation and 1300 Hz calling tone sent for all other modulations Identify Modem Manufacturer This command causes the DCE to send a message to the DTE indicating the DCE manufacturer This command is identical to AT FM FR and AT FMI GMI no
132. product to deviate from published specifications Current characterized errata are available on request Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order Copies of documents which have an ordering number and are referenced in this document or other Intel literature may be obtained by calling 1 800 548 4725 or by visiting Intel s website at http www intel com Copyright Intel Corporation 2001 Third party brands and names are the property of their respective owners 2 Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset CONVENTIONS This section lists conventions used in this data book Note S registers and AT commands are in bold typeface throughout this document Abbreviations Symbol Units of measure C degree Celsius uF microfarad us microsecond 1 000 nanoseconds Hz hertz cycle per second K memory kilobit 1 024 bits kbits second kilobit 1 000 bits per second kHz kilohertz kQ kilohm Mbyte memory megabyte 1 048 576 bytes MHz megahertz 1 000 kilohertz mA milliampere ms millisecond 1 000 microseconds ns nanosecond pV picovolt V volt W watt Acronyms Acronym Definition AC alternating current AT Attention command prefix for Hayes AT command set for example ATDT 123 CMOS complementary
133. ptions Continued VTX none Play Mode This command causes the modem to start voice transmission play back mode and play back a previously recorded voice message Upon receiving the AT VTX command the modem responds to the DTE with a CONNECT message at the current DTE to modem rate It is important that the UART s DTE to modem rate be equal to or higher than the compression scheme required UART data rate for example CL1 at 4800 samples second re quires 57 600 bps If the DTE to modem data rate is lower than the compres sion scheme required UART data rate then data may be lost or the playback message may be garbled After receiving the CONNECT message the DTE then sends the voice file to the modem To ensure that data is not overwritten the modem provides both hardware or software flow control with AT FLO n The modem also buffers the data to ensure steady voice delivery even though the voice data may be transferred from the DTE in bursts Playing mode is terminated when the data is exhausted and the modem receives the two terminating characters lt DLE gt lt ETX gt from the DTE Upon detecting lt DLE gt lt ETX gt the modem issues an OK result code After the modem s internal buffer is empty it returns to the command mode To abort playback mode immediately without waiting for the modem to empty its internal buffer send lt DLE gt lt CAN gt lt DLE gt lt ETX gt The modem aborts p
134. r Table 3 1 lists the commands used to obtain product information all identification commands are usable in data fax or voice mode Table 3 1 Product Identification Information AT Commands Product Pre FastPath Information ATin Command Data Mode Class 1 Fax Mode Intel Modems Modem ATI4 ATI7 AT GMI AT FMI AT FMFR Manufacturer Model Number ATI3 AT GMM AT FMM AT FMDL Revision Number ATI1 AT GMR AT FMR AT FREV Example 26 Intel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset ATI1 Causes the modem to send the modem s firmware version to the DTE Q D08 55 612 10 19 99 PARALLEL SPEAKERPHONE 05 DSP PATCH 001 55 Firmware version that is the modem s response to the command 3 5 Establishing a Modem Connection A D DS n S0 Data mode provides several methods for establishing a connection with a remote modem For each modem a connection can be initiated manually or automatically in both answer and originate modes A manual to manual connection is useful when both modems that are on hook are connected to an off hook telephone line For example if two people are talking on the telephone they can manually establish a modem connection without first hanging up When establishing a manual connection one modem must be designated as the originating modem and the other as the answering modem Manual originate mode is initiated by sending an A
135. read of the FIFO was longer than four continuous character times ago b When a time out interrupt has occurred then it is cleared and the timer is reset when the DTE reads one character from the RCVR FIFO c The time out timer is reset after a new character is received or after the DTE reads the RCVR FIFO 3 When the transmitter FIFO and the transmitter interrupt are enabled FCRO 1 IER1 1 the UART initiates XMIT interrupts under the following conditions a The Transmitter Holding register interrupt IIR 02 occurs when the XMIT FIFO is empty it is cleared as soon as the transmitter holding register is written to or the IIR is read During servicing the 1 16 character interrupt can be written to the XMIT FIFO 10 2 2 FIFO Polled Mode Operation Both the modem receiver and transmitter UART FIFOs can be set up for polled mode operation The UART FIFO is set for polled mode when FIFOE FCRO 1 and the respective interrupt enable bit IER 0 In polling mode the DTE checks the LSR for receiver and or transmitter status The LSR register provides the following information e LSR7 indicates when any errors occur in the RCVR FIFO e TEMT indicates when both the XMIT FIFO and Shift registers are empty The THRE bit LSRS is set to 1 whenever the XMIT FIFO is empty e LSR1 through LSR4 specify when a break interrupt framing error parity error or overrun error occurs e The DR bit LSRO is set to 1 as lo
136. rms the modem that the entire command string has been transmitted and that the modem should start processing all the commands within the command line A command line may include one or more AT commands that may or may not be separated by a space AT commands may be either upper or lower case characters but all characters for a given command must use the same case If there are multiple commands in a line a semicolon must be placed after each fax or voice command The modem can be configured to send back echo to the DTE any data that the DTE sends to the modem while in command state only The last command may be repeated by typing A without using a carriage return Each command line may include up to 80 characters and spaces Examples of AT command strings ATS1 lt CR gt A AT amp C1 amp D2 FCLASS lt CR gt AT amp C1 amp D2 FCLASS S0 1 lt CR gt The modem provides status information to the DTE in the form of response codes These response codes can be expressed in text or numeric form The supported response codes for V 90 mode are provided in Table 2 10 on page 21 and V 34 response codes are included in Table 2 11 on page 22 6 Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset Examples of modem responses OK ERROR CONNECT 28800 0 In the online state the DCE is off hook and communicating with a remote modem Any data sent from the DTE to the DCE is transmitted to
137. rogrammer s Guide Intel Confidential 25 a 56K V 92 Data Fax and Voice Chipset intel previously saved telephone numbers can be read from the modem using the view command AT amp Vn The AT amp Zn x command stores one of four telephone numbers in the NVRAM To dial these telephone numbers use the ATDS n command If the active profile is not stored in one of the two user profiles after setting up the modem then the current settings are lost when the commands ATZ or AT amp F are issued or when the modem is powered down Examples ATZ Resets and then configures the modem to NVRAM user profile 0 AT amp F S0 1 amp W1 amp F configures the modem for factory defaults amp Y1 S0 1 configures the modem to answer after one ring amp W1 saves the active configuration to user profile 1 amp Y1 configures the modem to use NVRAM user profile 1 as the power up defaults AT amp Z2 9 Stores a telephone number into the NVRAM as phone number 2 which can be 408 444 5555 re dialed later using ATDS 2 3 4 Modem Identification Commands In FMI FMR FMM GMI GMM GMR FMFR FMDL FREV The modem provides product identification AT commands that help determine the modem s manufacturer model number and product revision To provide flexibility with older software application programs the modem supports several commands that can be used to request a single item of identification such as a modem model numbe
138. rovided by two other commands Nn and S37 The command issued last takes precedence MS lt carrier gt lt automode gt lt min rate gt lt max rate gt same as same as Nn S37 The Nn command specifies whether the modem should attempt to establish a connection using a single modulation type or allow the connection to fall to a lower modulation type Nn performs the same function as the MS m lt automode gt parameter Whatever command is issued last configures the modem for any following connections Thus upon receiving the MS m command the modem changes the value for Nn When configured to NO the modem only attempts a connection at the lt carrier gt rate specified by S37 MS m and Bn If the remote modem does not support any of the lt carrier gt data rates the modem does not achieve a connection and responds back with a NO CARRIER message When configured to N1 the modem attempts to connect to the remote modem at the highest speed as defined by 37 MS m and Bn Since not all modems support or are configured for the same modem to modem data rates the modems may connect at a lower speed Intel Confidential Programmer s Guide tel 56K V 92 Data Fax and Voice Chipset S register S37 specifies the maximum data rate that can be attempted during a modem connection If S37 is set to 0 then the modem looks at the DTE rate to determine the maximum connection data rate If the DTE data rate doesn t m
139. s document are supported by firmware versions 6 06 and above for V 90 and 7 XX for V 92 Like the earlier solutions from Intel the V 90 V 92 56K family of products supports a variety of applications without the need of additional firmware development The MD566X solutions described in Table 1 1 are currently available except as noted Table 1 1 Intel V 90 V 92 56K Chipsets Chipset Contents Qty Notes MD5660AM S101 MD5660T M A 1 MD4450C SC B 1 Data Fax Voice MD1724 11VC B 1 Parallel Serial RS232 interfaces MD5661AM V101 MD5661DT L A 1 1 MD4451C VC B 1 Data Fax Voice MD1724 11VC B 1 PCMCIA interface MD5662AM S101 MD5660DT M A 1 MD4I0C SCP Data Fax Voice Speakerphone MD1724 11VC B 2 Parallel Serial RS232 interfaces MD5663AM V101 MD5661DT L A 1 Data Fax Voice MD4450C SC B 1 MD1724 11VC B 1 MD4452C VC B 1 5 MD5661DT L A 1 CompactFlash MD5664GL V101 513014 1 Data Fax S513021 1 MD4452C VC B 1 MD5661DT L A 1 CompactFlash MD5664US V101 513012 1 Data Fax 513021 1 Programmer s Guide Intel Confidential 5 a 56K V 92 Data Fax and Voice Chipset intel 1 1 V 92 V 90 and V 34 Data Modes Intel MD566X chipsets default to the ITU T V 90 or V 92 data transmission mode depending on the firmware version The V 90 V 92 mode allows receive data rates of up to 56 kbps over the PSTN public switched teleph
140. s not send an OK message to indicate it has performed the requested function n 0 In asynchronous mode amp Q0 the modem ignores DTR n 1 The modem switches from data mode to command mode when an on to off transition of DTR occurs n 2 An on to off transition of DTR causes the modem to go on hook hang up While DTR is off auto answer is disabled n 3 An on to off transition of DTR re initializes the modem The re ini tialize procedure performs the same function as a power up reset except that the UART registers are not reconfigured amp F none Load Factory Defaults This command loads command defaults and S reg ister factory defaults into the active configuration and configures the modem for data mode amp Gn 0 Guard Tone Option This command controls whether the modem sends out guard tones while connected to a remote modem for ITU T V 22 bis 1200 bps and V 22 bis 2400 bps connections only Guard tones may be required in some countries but are not needed in the United States Guard tones are sent by the answer modem to disable Central Office echo cancel ers n 0 Guard tone disabled n 1 550 Hz guard tone enabled n 2 1800 Hz guard tone enabled amp Kn 3 Select Serial Port Flow Control This command specifies the DTE to modem flow control Software flow control uses the characters XOFF 13h and XON 11h to stop and start data transmission respectively both to and from the DTE Bidirection a
141. s permissible settings F lt command gt lt parameter gt Sets parameters NOTE To originate a call answer and hang up use the ATD ATA and ATHn commands respectively The fax AT FCLASS command is used for changing between fax classes determining the current class selection and determining the supported fax classes Both data fax Class 0 data modem mode and Class 1 fax modem mode are implemented by the modem In Class 0 the DTE to modem data rate can be set from 300 bps to 115 200 bps In Class 1 it is recommended that the DTE to modem data rate is set to 19 200 bps The silence time timers consist of AT FTS lt TIME gt and AT FRS lt TIMEs gt Silence time is defined as the length of time when the modem neither receives nor transmits energy that is modem transmit carrier on the telephone line The modem exchanges streams of data with the DTE while executing the data transfer commands AT FTM lt mod gt AT FTH lt mod gt AT FRM lt mod gt and AT FRH lt mod gt The values supported for lt mod gt are provided in Table 5 2 During data transfer an ASCII lt DLE gt character 10h is used as a special character to shield other special characters Special characters in the data stream are used in the following way any data lt DLE gt lt ETX gt end of data stream any data lt DLE gt lt DLE gt Single 10 in data stream any data lt DLE gt lt not DLE or ETX gt delete bo
142. ses This may indicate one of several conditions the remote telephone was picked up before the ringback tone was generated the number is no longer in service or the number was incomplete This timer is disabled after detecting the first ringback n 0 255 in 1 second increments n 0 The DCE immediately returns the OK result code after dialing n 10 10 10 seconds Programmer s Guide Intel Confidential 91 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descriptions Continued VRX none Record Mode This command causes the modem to enter record mode to record voice messages Upon receiving the AT VRX command the modem responds to the DTE with a CONNECT message at the current DTE to modem rate It is important that the UART DTE to modem rate be equal or higher to the compression scheme re quired UART data rate for example CL1 at 4800 samples second requires 57 600 bps If the DTE to modem data rate is lower than the compression scheme required UART data rate then data may be lost or may be garbled during playback of the message After sending the CONNECT message the modem then sends digitized voice data that is lt DLE gt shielded to the DTE The modem buffers the data to ensure steady voice delivery even though the voice data may be transferred to the DTE in bursts The DTE may use the lt DLE gt lt NUL gt shielded code as a no operation command to refresh the in
143. ss Conte 0 0 0 1 None None Receiver Line Overrun Error Parity Reading the LSR Line 0 1 1 0 Highest Status Error Framing Error or Status register Break Interrupt g Reading the RBR 0 1 0 0 Second Received Data Receiver Data Available Receiver Buffer register Available or Trigger Level Reached or the FIFO Drops below the Trigger Level No characters have been removed from or entered Character into the RCVR FIFO dur 1 1 0 0 Second Time out ing the last four character peices baie Indication times and there is at least g one character in it during this time Transmitter Reading the IIR register if 0 0 1 0 Third Holding Transmitter Holding the source of interrupt or Register Register Empty writing into the Transmit Empty ter Holding register Clear to Send Data Set Ready Reading the MSR 0 9 9 E Fourth Modem Status Ring Indicator or Data Modem Status register Carrier Detect Bits 7 6 FIFOs Enable Bits These two bits are set whenever FCRO 1 Bits 5 Not used This bit is permanently set to 0 Bit 4 Reserved Bit 3 Interrupt ID Bit 2 In 16C450 mode this bit is always a 0 In FIFO mode both this bit and bit IIR2 are set whenever a time out interrupt is pending Pees Interrupt ID Bits IDO and ID1 These two bits are used to identify the highest priority interrupt as shown Bits 2 1 in Table 10 2 Programmer s Guide Intel Confidential 125 56K V 92 Data Fax and Voice Chipset in Interrupt Pend
144. t of lt freq gt and lt duration gt parame ters lt freq gt is in units of Hz and lt duration gt is in units of 0 01 seconds The tone string consists of up to three types of elements a single ASCII charac ter a string in brackets and a string in braces Commas must separate the ele ments Missing elements assume the value of zero The following list explains each element and how it can be used Programmer s Guide Intel Confidential 97 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descriptions Continued DTMF and Tone Generation cont 1 Single ASCII character in the set 0 9 and A D which is interpreted as a single DTMF tone DTMF tones are sent as a single element expressed in the form AT VTS lt DTMF or gt For example to send a DTMF 1 tone issue AT VTS 1 to the modem 2 String drawn from the first set but not including a flash hook code and en closed in brackets which can produce a single or dual tone The string in cludes three parameters which set the frequency of two non standard DTMF or single tones and a common duration for both The quantity in brackets consists of a three element list that is expressed in the following format AT VTS lt first tone freq 1 gt lt second tone freq 2 gt lt duration gt If the duration is not specified in the lt duration gt parameter the modem sends tones for the duration specified
145. tel Confidential Programmer s Guide a intel A 56K V 92 Data Fax and Voice Chipset Table 7 1 S Register Command Descriptions Continued Maximum Line Speed Attempted cont n 0 35 n 0 DTE rate n 1 Reserved n 2 Reserved n 3 300 n 4 Reserved n 5 1200 n 6 2400 n 7 4800 n 8 7200 n 9 9600 n 10 12 000 n 11 14 400 n 12 16 800 n 13 19 200 n 14 21 600 n 15 24 000 n 16 26 400 Sar a n 17 28 800 n 18 31 200 n 19 33 600 n 20 36 000 n 21 33 333 n 22 37 333 n 23 41 333 n 24 42 666 n 25 44 000 n 26 45 333 n 27 46 666 n 28 48 000 n 29 49 333 n 30 50 666 n 31 52 000 n 32 53 333 n 33 54 6662 n 34 56 0008 n 35 57 3334 Programmer s Guide Intel Confidential 109 56K V 92 Data Fax and Voice Chipset in a Current download speeds are limited to 53 333 bps due to FCC rules that restrict modem power output 110 Intel Confidential Programmer s Guide 56K V 92 Data Fax and Voice Chipset 8 CALLER ID This section describes Caller ID for the United States Caller ID is a service that lets the called party know the telephone number of the caller before the call is answered The information transmitted to the called party via Caller ID includes the caller s name call date the call time and the call number This service is not available everywhere due to central office telephone equipment limitations and legal prohibition in some locations The VCID n command controls the reporting and present
146. th lt DLE gt and next character When the DTE transfers data to the modem the DTE must insert a lt DLE gt for each lt DLE gt in the original data stream In addition when data is no longer available the DTE must add the stream terminator lt DLE gt lt ETX gt to the end of the data stream The modem buffers up to one thousand Programmer s Guide Intel Confidential 73 56K V 92 Data Fax and Voice Chipset intel bytes of fax data before sending it to the remote modem AT FTM command If the modem detects the two terminating characters lt DLE gt lt immediately to the remote modem without waiting for the buffer to fill up Table 5 2 lt mod gt Selection Table Value Modulation Speed bps 3 V 21 ch 2 300 24 V 27 ter 2400 48 V 27 ter 4800 72 V 29 7200 73 V 17 7200 74 V 17 with short train 7200 96 V 29 9600 97 V 17 9600 98 V 17 with short train 9600 121 V 17 12 000 122 V 17 with short train 12 000 145 V 17 14 400 146 V 17 with short train 14 400 ETX gt within the data stream it transmits the data When the modem transfers data to the DTE the DTE must filter the data stream by removing all character pairs beginning with lt DLE gt The DTE also must recognize lt DL terminator Upon detecting lt DLE gt lt DLE gt the DTE must reinsert a single lt DL gt lt ETX gt as the stream
147. the received data available interrupt 10 1 9 Transmitter Holding Register THR Register 0 THR DLAB 0 The THR Transmitter Holding register is a write only register used for sending data and AT commands to the modem 10 1 10Receiver Buffer Register RBR Register 0 RBR DLAB 0 The RBR Receiver Buffer register is a read only register used for receiving data and AT command responses from the modem 126 Intel Confidential Programmer s Guide a intel Ps 56K V 92 Data Fax and Voice Chipset 10 1 11Divisor Latch Registers DLM and DLL DLAB 1 Register 0 DLL LS DLAB 1 The LS divisor latch least significant byte and MS divisor latch most significant byte are two read write registers used to set the modem data rate The data rate is selected by loading each divisor latch with the appropriate hex value The programmable data rates are provided in the following table For example to use a data rate of 2400 bps load a 00h into the DLM and a 30h into the DLL Table 10 3 Programmable Data Rates Data Rate Divisor Number Divisor Latch Hex Decimal MS LS 300 384 01 80 1200 96 00 60 2400 48 00 30 4800 24 00 18 7200 16 00 10 9600 12 00 oC 19200 6 00 06 38400 3 00 03 57600 2 00 02 10 2 16C550A UART FIFO Operation The modem 16C550A UART FIFO works in both interrupt and polled operation A description of each type of operation is prov
148. the remote modem Similarly any data that the DCE receives from the remote modem is transmitted to the DTE Note In the online state the DCE does not echo back any of the data that the DTE sent to the DCE The modem recognizes AT commands from the DTE at any valid data rate from 300 bps to 115 200 bps that is the modem autobauds up to 115 200 bps however the DTE should use the data rate specified for each mode according to the transmitting direction DTE to modem Table 1 2 or modem to modem Table 1 3 Table 1 2 DTE to DCE Data Rates for Each Mode Mode Data Rate bps Affected Data Data V 34 2400 115 200 Data V 90 28 800 115 200 DTE to ta rat Data V 92 28 800 115 200 emevemdatstale Fax 19 200 D AT commands playback and record modes waite 19 200 115 200 varies according to compression type Table 1 3 DCE to DCE Data Rates for Each Mode Mode Data Rate bps Affected Data Data V 34 E transmit and receive 2400799 600 Data V 90 transmit 4800 33 600 Data V 90 receive 28 800 56 000 ISP connections only DTE to modem data rate Data V 92 transmit 24 000 48 000 Data V 92 receive ISP connections only 28 800 56 000 Fax 2400 14 400 Voice Not applicable Not applicable Each command may have one or more parameters associated with it If a parameter is not sent for a command requiring a numeric parameter then the modem assumes a zero
149. the stack Bit 1 OE Overrun Error Not supported Bit O Data Ready This bit is set to 1 whenever the modem writes a new received data character into the RBR Receiver Buffer register or FIFO This bit is reset to O whenever the DTE reads the RBR or FIFO 10 1 4 Modem Control Register MCR 122 Intel Confidential Programmer s Guide a intel 4 56K V 92 Data Fax and Voice Chipset This register controls the DTE DCE UART interface Bit 7 5 Not used These bits are permanently set to 0 Loop Bit When set to 1 this bit configures the UART for loopback diagnostic testing In diagnostic mode any data that is written to the THR Transmit Holding register is looped back to the RBR Receiver Buffer register Bit 4 After writing a data byte to the THR register in loopback mode the DTE must read the RBR register before writing a new data byte to the THR Unlike a real 16C450 UART the modem signals OUT1 OUT2 RTS and DTR are not looped back to the MSR register Bit 3 Out 2 This bit when set to 1 by the DTE enables the HINT output pin When set to 0 this bit causes the HINT pin to be in a high impedance state Bit 2 Out 1 This read write bit is not used for any specific functions Bit 1 RTS Request to Send This bit when set to 1 indicates that the DTE is ready to send data to the modem Bit 0 DTR Data Terminal Ready When set to 1
150. then one and a half stop bits are generated for each transmitted data character The receiver only checks for the first stop bit regardless of the number of stops bits transmitted Word Length Select Bits WLS1 and WLSO These two bits specify the data character word length of the transmitted and received data The supported word lengths are provided below i Bit 1 Bit 0 Word Length Bits 1 0 0 0 Pinte 0 1 6 bits 1 0 7 bits 1 1 8 bits 10 1 6 FIFO Control Register FCR Register 2 write only This write only register is used to enable the receiver and transmitter FIFOs clear the FIFOs set the RCVR FIFO trigger level and select the DMA signaling type MSB and LSB RCVR Trigger Bits FCR bits 7 and 6 are used to set the trigger level for the RCVR FIFO interrupt RCVR FIFO Trigger Level Bytes 0 01 1 04 0 08 1 14 Bit 7 Bit 6 Bits 7 6 0 0 1 1 Bits 5 3 Reserved Bits 5 4 and 3 are reserved for future enhancements XFIFOR XMIT FIFO Reset When set to 1 this bit clears all the bytes in the XMIT FIFO and resets the Bit 2 internal counter logic to 0 The internal shift register is not cleared by the XFIFOR bit This bit is automati cally cleared by the modem RFIFOR RCVR FIFO Reset When set to 1 this bit clears all the bytes in the RCVR FIFO and resets the Bit 1 internal counter logic to 0 The internal shift register is not cleared by the RFIFOR bit This bit is
151. tus during the DCE s modem on hold exchange procedure as defined below This response may be delayed de pending upon the context under which the PMHR command is made i e if the PMHR is in response to an incoming Modem on Hold or if it is initiating a request m 0 V 92 Modem on Hold Request Deniedor not available m 1 MOH with 10 second timeout Granted m 2 MOH with 20 second timeout Granted PMHR ee m 3 MOH with 30 second timeout Granted m 4 MOH with 40 second timeout Granted m 5 MOH with 1 minute timeout Granted m 6 MOH with 2 minute timeout Granted m 7 MOH with 3 minute timeout Granted m 8 MOH with 4 minute timeout Granted m 9 MOH with 6 minute timeout Granted m 10 MOH with 8 minute timeout Granted m 11 MOH with 12 minute timeout Granted m 12 MOH with 16 minute timeout Granted m 13 MOH with indefinite timeout Granted Implementation of this parameter is mandatory if V 92 is implemented in the DCE PCM Upstream Ignore This command controls the use of PCM upstream in a V 92 DCE PIG m 0 m 0 Enable PCM upstream m 1 Disable PCM upstream V 92 Modem on Hold Hook Flash This command causes the DCE to go on hook for a specified period of time and then return on hook The specified period of time PMHF none is normally one half second but may be governed by national regulations If this command is initiated and the modem is not On Hold ERROR is returned This com mand applies only to V 92 Modem on Hold V 92 Phase 1 and Phase 2 Control Th
152. ty If the received analog signal stays below this speci fied level for a user specified time delay the modem sends lt DLE gt lt q gt to the DTE The modem sends only one lt DLE gt lt q gt to the DTE each time record mode VRX is entered lt sds gt 121 131 n 128 Nominal level lt sdi gt Length of Silence This parameter sets the period of silence that must elapse before the DCE reports silence as detected by Quiet or Silence lt sdi gt 0 255 units of 0 1 second n 0 Silence detection disabled n 50 Silence detection enabled Programmer s Guide Intel Confidential 93 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descriptions Continued VSM m manufac turer specified Compression Method Selection This command contains four parameters that specify the voice compression method voice sampling rate silence compression sensitivity and the degree of silence expansion The DCE can support different capabilities for each compression method m lt cml gt lt vsr gt lt scs gt lt sel gt Defaults m 140 8000 0 0 lt cml gt Compression Method This parameter selects a voice compression method The DTE can obtain the label and a string constant identifier by using the VSM command Range lt cml gt 0 2 128 129 132 140 141 Default lt cml gt 140 lt cml gt 0 LIN1 8 bit Linear PCM pulse code modulation sampling usin
153. uld be set to zero Programmer s Guide Intel Confidential 85 a 56K V 92 Data Fax and Voice Chipset intel Table 6 1 Voice Mode Command Descriptions Continued VEM m cont 86 see m Event Reporting and Masking cont Example 1 Viewing Supported Events To determine what events are supported by the modem send AT VEM AT VEM C Feature Class DB860980 lt Playback mode events OFEE0883 lt Record mode events BB863EE0 lt Command mode events OK Example 2 Setting the Event Mask To set the event mask issue AT VEM m where m is eight hex digits This com mand is issued only in command mode and is followed when changing between voice modes That is the modem uses the event mask previously set by the VEM m command when entering playback or record mode The modem ig nores any event bit set when that feature is not supported in that voice mode AT VEM BB8 63 EEO Example 3 Reading the Event Mask Settings To read the settings for each event type AT VEM BB863EE0 OK Example 4 Understanding the VEM Hexadecimal Code The following illustration shows how the hexadecimal eight digit code BB863EE0 is derived from the bit setting for each event HEX DIGIT LOCATION 12345678 EIGHT DIGIT HEX CODE BB863EE0 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mo
154. voice pa rameters to the factory default values This command does not change relay or speaker setup that is if the modem is off hook then the modem remains off hook after processing this command VIT n DTE DCE Inactivity Timer This command sets the length of time the modem can be inactive in voice mode before the modem resets its relays VLS 0 and changes to data mode FCLASS 0 with autobauding The purpose of this timer is to ensure that the DTE does not leave the DCE in a mode that cannot be ac cessed by voice unaware software This timer is supported in playback record and voice command mode Sending any data such as a lt DLE gt lt NUL gt string to the modem re initializes this timer n 0 255 units of 1 0 second n 0 Disables inactivity timer n 0 Inactivity timer active 88 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 6 1 Voice Mode Command Descriptions Continued Relay Playback Control This command controls the four uP relay drivers and controls hardware paths for voice playback record transmit and receive Preassigned Voice I O Labels lt label gt 0 1 2 3 VLS n 0 10 11 12 13 14 15 16 Primitive Code None T L LT S ST MST S1 S1T MS1T M1 M1ST M1S1T HT HT Description DCE on hook Local phone connected to Telco DCE off hook DCE connected to Telco Local phone pro vi
155. with a V 42 modem A space or carriage return is usually chosen for the fallback character n 0 127 ASCII character MNP 5 Data Compression Control This command controls whether the data sent during the MNP frames is compressed using MNP Class 5 compression standard MNP 5 data compression can improve throughput by as much as 150 Cn 1 i n 0 1 n 0 No compression n 1 MNP Class 5 compression MNP Block Size This command specifies the maximum number of data bytes in an MNP data frame A smaller frame size may improve throughput on high impairment noisy telephone lines n 0 3 An 3 n 0 Maximum 64 characters n 1 Maximum 128 characters n 2 Maximum 192 characters n 93 Maximum 256 characters Transmit Break This command causes the modem to send a break attention sig nal to the remote modem for a duration specified by n When n 0 the default Bn none break length is used n 0 9 units of 100 ms 66 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 4 2 V 44 V 42 V 42 bis and MNP Data Mode Command Descriptions Set Auto Reliable Buffer requires a license from Microcom In auto reliable mode N3 this command determines the fallback method and enables data buffer ing The settings for this command are used by the modem during the V 42 detection phase n 0 2 Cn 0 n 0 Does not buffer data n 1 Reserved n 2 Does not buffer data Switches to buffer normal m
156. ximum modulation data rate is less than or equal to the DTE data rate then the highest data rate is the highest modulation data rate If the maximum modulation data rate is greater than the DTE data rate then the highest data rate is the modulation data rate equal to or just below the DTE data rate lt max rate gt 0 Highest permitted data rate Examples DTE data rate 115 200 bps Speed Range MS m MS V32 1 0 0 300 9600 cont see m ims v32 0 0 0 4800 9600 MS V32B 1 9600 14400 9600 14400 MS V34 1 0 O 2400 28800 MS V34 1 2400 28800 2400 28800 MS V34 1 9600 28800 9600 28800 MS V34 1 28800 28800 28800 only MS V34 0 19200 26400 19200 26400 MS V90 1 0 50666 4800 50666 Examples DTE data rate 2400 bps Speed Range MS V32 0 0 0 NO CARRIER MS V32B 1 9600 14400 9600 14400 MS V34 1 0 0 2400 2400 MS V34 1 2400 28800 2400 28800 MS V34 1 9600 28800 9600 28800 MS V34 1 28800 28800 28800 only MS V34 0 0 O 2400 only MS V34 0 19200 26400 9200 26400 MS V90 1 0 50666 4800 50666 58 Intel Confidential Programmer s Guide intel 56K V 92 Data Fax and Voice Chipset Table 3 4 Data Mode Command Descriptions Continued Call Waiting Enable This command controls the action to be taken upon detection of call waiting in a V 92 DCS PCW m 0 m 0 Toggle V 24 Circuit 125 and collect Caller ID if enabled by VCID m 1 Hang up m
157. ypically are different for most V 34 connections over the PSTN The MS command sets the modulation speeds in the V 34 chipsets however BO also must be sent to set the modulation to V 22 Sending B1 sets the modulation to Bell 212 These commands can be typed before or after the MS command For ex ample to set the modulation to ITU T V 22 MS V22 1 1200 1200 BO To check the settings for the MS command type AT MS m lt carrier gt lt automode gt lt min rate gt lt max rate gt Defaults m V90 1 0 0 lt carrier gt This eight digit string parameter specifies the type of modulation used Approved codes are shown in the following table The modem can switch automati cally between some types lt carrier gt Description v21 V 21 300 bps V22 V 22 1200 bps V22B V 22 bis 1200 and 2400 bps V23C V 23 with constant carrier 1200 bps forward and 75 bps reverse V32 V 32 4800 and 9600 bps V32B V 32 bis 7200 9600 12 000 and 14 400 bps V34 V 34 asymmetrical connections 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 and 28 800 bps V34S V 34 symmetrical only connections 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 bps V34B V 34 extended asymmetrical connections 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 and 33 600 bps V34BS V 34 extended symmetrical connections 2400 4800 7200 9600

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