FlexROM+ User`s Manual
Contents
1. TECHTOOLS FlexROM User s Manual 972 272 9392 Fax 972 494 5814 email sales tech tools com web www tech tools com ftp ftp tech tools com TECHTOOLS FlexROM 10 DAY Money Back Guarantee IF within 10 days of having received your product you find that it does not suit your needs you may return it for a refund TechTools will refund the purchase price of the product excluding shipping handling costs providing the product has not been altered or damaged Warranty TechTools warrants its products against defects in materials and workmanship for a period of 90 days If you discover a defect TechTools will at its option replace repair or refund the purchase price Simply call us during business hours and ask for Technical Support If we cannot solve your problem by phone an RMA Return Merchandise Authorization number will be issued to you Please include this number with the returned product This warranty does not apply if the product has been modified or damaged by accident abuse or misuse Copyrights and Trademarks Copyright O 1994 1995 by TechTools All rights reserved FlexROM TechTools and all variations of the TechTools logo are trademarks of TechTools Garland Texas Other brand and product names are trademarks or registered trademarks of their respective holders Disclaimer of Liability TechTools is not responsible for special incidental or consequential damages resulting2. 1 PLUSEDIT EXE a full screen interactive interface for setup pre download editing and post download editing patching 2 PLUSLOAD EXE a command line batchable setup and downloader for time saving automation PLUSEDIT EXE SETUP Load PLUSEDIT EXE from the DOS PROMPT In the middle of the screen the PLUSEDIT SETUP window will be displayed The following options are available EPROM SIZE This must accurately reflect the size of the device being emulated and MUST NOT be set for a device larger than the ram installed on FlexROM NOTE This should also match your DEVICE SIZE setting of SW 1 see Figure 4 page 4 PORT Selects parallel port address for the emulator if you need to use a different address than those listed see PLUSLOAD EXE NUMBER OF ROMS Selects the number of daisy chained FlexROM s Up to four units may be chained together see Figure 5 page 6 SEMAPHORE Controls the semaphore byte The semaphore byte is a location in memory which be accessed by the PC AND your TARGET without arbitration LOW configures FlexROM to decode offset 0 as the semaphore byte HIGH 27040 only instructs FlexROM to use 7FFFF as the semaphore byte Any access to the selected location will access the semaphore byte instead of Normal memory see Advanced Installations page 16 Many customers do not need the Semaphore Byte so the default setting 18 DISABLE A
3. 18 TECHTOOLS FlexROM CONNECTIONS MODE IRQ IRQ WAIT RESET or RESET connected to TARGET reset optional connected to TARGET write optional SEMAPHORE BYTE HANDSHAKING The control bits within the semaphore byte can be used to implement a handshake protocol between the HOST and TARGET For example The HOST could set HO to indicate that he wants control of the memory space and then wait for the target to grant access by setting TO The TARGET will only do so when it is safe for him he is executing out of some other memory space for the duration of the HOST access The following pseudo code illustrates this concept HOST char read_byte address set host request bit wait for target granted bit data read address clear host request bit return data TARGET void POLL void if HOST request bit set call GRANT return this routine MUST be outside of the emulator memory space GRANT void if I feel generous set my granted bit wait for HOST request bit to clear clear my granted bit return 19 TECHTOOLS FlexROM CONNECTIONS MODE IRQ IRQ n c WAIT n c RESET or RESET connected to TARGET reset optional WRITE connected to TARGET write SEMAPHORE HANDSHAKE with interrupts This approach is similar to the last one The main difference is that the FlexROM IRQ line is used to interrupt the TARGET when access is needed A target SEMAPHORE bi
4. from any breach of warranty or under any legal theory including lost profits downtime goodwill damage to or replacement of equipment or property and any costs or recovering reprogramming or reproducing any data stored in or used with TechTools products TECHTOOLS FlexROM TABLE OF CONTENTS INTRODUCTION it 1 CONFIGURATION 1 CABLE SIZE J6 2 DEVICE TYPE 77 and J8 2 OPERATING MODE J9 3 5 3 EPROM FLASH SIZE 8 1 1 1 3 BASIC INSTALLATION 5 ADDITIONAL 8 1 8 SOFTWARE 9 9 5 9 LOADING A FILE 10 READING from the Emulator 10 DOWNLOADING to the Emulator 11 PLUSLOAD EXE 2 2 2 11 HEX2BIN EXE 22 22 n nn nnn nnn n nnn nnn n ence
5. file into two files From the DOS command prompt type DIVIDE source file low file high file desired size of low file in hex example divide big bin low bin high bin 8000 12 TECHTOOLS FlexROM TROUBLESHOOTING TIPS PlusLOAD performs error checking before and optionally after the download The possible error messages and possible solutions are listed below 1 A PRINTER PORT WAS NOT FOUND xxxx At the beginning of the download the program verifies that the device at the selected port address appears to be a printer port This error is printed if there is no device at this address or the device does not respond like a printer port Use the command line parameter to configure PlusLOAD for the base address of a valid printer port The most common port addresses are 3BC 278 and 378 2 ERROR THE FlexROM IS NOT RESPONDING After the printer port is verified PlusLOAD check to see if a FlexROM 1s connected and communicating properly This message is generated if the FlexROM fails to respond properly If you receive this message check the following items 1 Verify that the FlexROM is plugged into the printer port that was specified Verify that the cable is connected properly Verify that the target is powered up during the down load Verify that the FlexROM is plugged in properly Verify that J6 is jumpered properly for the target cable size DURAN Remove any
6. neces 12 SHUFFLE EXE 12 DIVIDE EXE 12 TROUBLESHOOTING TIPS 13 TECHTOOLS FlexROM ADDITIONAL HELP ee 15 ADVANCED 5 5 16 ABSOLUTE or RESET ARBITRATION 16 WAIT STATE ARBITRATION 17 Bus REQUEST GRANT ARBITRATION 17 SEMAPHORE BYTE AVOIDANCE 18 SEMAPHORE BYTE HANDSHAKING 19 SEMAPHORE HANDSHAKE with interrupts 20 SEMAPHORE SOFTWARE 20 SUMMARY ss aa atte 21 ADDITIONAL NOTES SS o ted 21 LIBRARY REFERENCE 22 APPENDIX 22 EMULATING 16 bit EPROMS 22 TABLE FIGURES 23 TECHTOOLS FlexROM INTRODUCTION Thank you for selecting a TechTools product We have made every attempt to provide a quality product at an affordable price Our goal is to provide tools for Embedded Systems develoment th
7. target if automatic reset is desired during each download RESET and RESET are tri stated TTL CMOS compatible outputs capable of sourcing or sinking 15 milliamps They are active during downloads and tri stated during emulation Refer to Table 1 below NOTE The target MUST be reset after a download This is done automatically if you connect the reset line from the emulator to the target If you choose NOT to connect the reset line to the target you MUST manually generate a reset after the download TECHTOOLS FlexROM FUNCTION NOTES RESET pin closest to LED WRITE from TARGET Figure 6 Feature Connector J3 NOTE Pins 4 and 5 are dual purpose Thier function is determined by the setting of the MODE jumper 11 Apply power to the target system 12 Run the loader program We wrote PlusLOAD EXE as a command line driven routine rather than an interactive one This allows you to run the program from a batch file without intervention It can be added directly to your Compile Link Locate batch file Enter PlusLOAD without parameters to see the parameter syntax and defaults All parameters are optional and can be listed in any order The Printer Port is specified by base address rather than LPTx This allows the use of multi port parallel cards that do not map directly into LPT1 LPT3 Most BIOS DOS compatible printer ports are located at one of the following I O addresses 378 3BC or 278 You will also fi
8. 462101 Garland TX 75046 2101 Voice 972 272 9392 FAX 972 494 5814 email supportOtech tools com Please be prepared with the following information EPROM FLASH device being emulated DIP switch and jumper settings SRAM size and speed being used Command line parameters being used EXACT if any error messages generated Target information CPU SPEED strange memory maps etc Anything that seems unclear or ambiguous in the instructions 15 TECHTOOLS FlexROM ADVANCED INSTALLATIONS WE HIGHLY RECOMMEND THAT YOU VERIFY THE BASIC INSTALLATION BEFORE PROCEEDING TO THE MORE ADVANCED SETUPS This section documents the more advanced features of FlexROM and how to use them FlexROM supports three different Arbitration schemes and DUAL PORTED communications port These mechanisms allows the target and HOST to each access the emulator s memory and to communicate without affecting each other opening the door to several debugging techniques The arbitration mechanisms allow shared access to the emulator s memory This capability can be used to implement a memory mapped UART for HOST lt gt Target communications It also permits target programs to write debugging trace information into un used EPROM locations The user can then read this information from PlusEDIT EXE or with custom programs using PlusUTIL LIB without stopping the target In addition to arbitration FlexROM has a single memory location that suppor
9. RBITRATION This determines how the emulator and your target respond to PC access see ADVANCED INSTALLATIONS pg 16 TECHTOOLS FlexROM NONE All reads writes and downloads occur without regard to the current status of the target This is not recommended because collisions will occur possibly locking up the target RESET Most common FlexRom resets the target during reads writes and downloads see page 6 READY FlexROM and the target use the ready line to arbitrate HOLD FlexROM and the target use the bus grant lines to arbitrate see OPERATING MODE J9 page 2 Figure 6 Feature Connector 73 page 7 AUTO UPDATE When selected data changes made in the hex editor buffer are automatically written to the emulator when you leave the current line If not selected updates will not take place until you request an emulator write operation LOADING A FILE To load a file from disk into the hex editor buffer select OPEN from the FILE menu or F3 and select your file Next choose your file TYPE The next two options are as follows START ADDRESS Loading address With binary files loading begins at the starting address and continues until all data is loaded into the buffer With an Intel or Motorola file the START ADDRESS is subtracted from the address information present in the file If a Hex file starts at 1000h then the START ADDRESS should be set to 1000h FILL
10. RESET or RESET connected to TARGET reset optional WRITE connected to TARGET write optional SEMAPHORE BYTE AVOIDANCE The FlexROM contains a fully dual ported byte of memory This byte can be accessed by the TARGET and the HOST at any time without fear of a collision A command line flag allows you place this byte at offset 0 in the FlexROM memory space or at offset Ox7ffff The downloader DISABLES it by default This SEMAPHORE byte can be used in several ways The diagram below documents the contents of this byte SEMAPHORE BYTE DEFINITION Bol 5 Ba B2 Bi C0 C2 COUNTER READ ONLY 2 HOST CONTROL Only the HOST can write both can read CONTROL Only the TARGET can write both can read In simple avoidance the HOST accesses FlexROM at will The target watches the counter bits to determine when it is safe to access the memory thereby avoiding a collision The counter bits are actually the bit counter for the serial download from the host The HOST will actually READ or WRITE to the memory IMMEDIATELY AFTER THE COUNTER BITS ADVANCE TO xxxxx111B If the target NEVER accesses the memory space when the counter bits are set it will never collide with the HOST This method does not require additional connections to the target Naturally this will NOT work if the target is executing out of this same memory space because the code fetches would not watch the counter bits
11. ROM set BOTH JUMPERS to the EPROM position The default setting configures the FlexROM for an EPROM pinout TECHTOOLS FlexROM OPERATING MODE J9 The MODE jumper J9 determines the basic operating mode This jumper configures FlexROM for Interrupt IRQ mode or Request Grant REQ mode In IRQ mode FlexROM can generate interrupts to the target and generate wait states for arbitration In REQ mode FlexROM can use bus REQUEST GRANT handshaking for arbitration RQ REQ Figure 3 operating mode 79 If you want to use interrupts and or wait state arbitration set J9 to If you want to use Request Grant arbitration set J9 to REQ If you are using none of these features leave J9 set to IRQ This is the default configuration SRAM Install the SRAM into the FlexROM Insert a 1Mbit 128Kx8 SRAM TC551001APL or equivalent into location U6 with the notch pointing the same direction as the notch shown on the silk screen Additional SRAM if used should be inserted in order from U7 through U9 EPROM FLASH SIZE SW1 dip switches configure the FlexROM for the DEVICE SIZE being emulated These MUST be set correctly for the unit to function properly These switches intercept the upper address lines from the target SW1 1 controls the highest address line A18 The next one controls A17 and so forth To emulate a 4Mbit device 27C040 28F040 turn ON all swit
12. T receive any error messages check the following 1 Verify that the DIP switches are set properly 2 Verify that J6 J7 and J8 are set properly 3 Verify that the download file will fit in the EPROM being emulated 4 Verify that the FlexROM cable is plugged into the target properly 5 Verify that the target is supplying a full clean 5 Volts to the FlexROM 6 Verify that the target has adequate power supply by passing particularly if itis a 2 layer or wire wrapped board FlexROM requires TWO to FIVE times as much current as the device it is emulating 7 Verify that the download file is a BINARY file Use HEX2BIN to convert it if necessary 8 Ifyou used a HEX to BINARY conversion program verify that you specified the REAL physical starting address of the EPROM for the conversion 9 If you used the O parameter for the download verify that you really needed this option It is rarely used 10 Use PlusEDIT exe to view the contents of the emulator Verify that the code is located properly and looks correct 14 TECHTOOLS FlexROM 11 Try a manual reset of the target after the download If this works verify the reset polarity being used and that you are connecting to the correct place on the target 12 Verify that the emulator access time 30ns SRAM speed is fast enough for the target ADDITIONAL HELP If you need additional technical assistance we can be reached at TechTools PO Box
13. VALUE Any value entered here will be used to unused locations in the emulated EPROM Once the file is loaded into the buffer you will see the hex editor screen This screen allows byte by byte hex or ASCII editing For user control info click on Help at the bottom of the screen Alt h A window will appear explaining all editing keys READING from the Emulator To read data from the emulator into the buffer select READ from the EMULATOR menu window appears asking you to wait while data 15 being read into the HEX EDITOR buffer 10 TECHTOOLS FlexROM DOWNLOADING to the Emulator To download the current contents of the HEX EDITOR buffer into the emulator select WRITE from the EMULATOR menu A window appears asking for the following information BUFFER START This is the address in the HEX EDITOR buffer where you want the download to start usually 00000h BUFFER END This is the address in the HEX EDITOR buffer where you want the download to end This is usually set to the highest address for the EPROM being emulated OFFSET This is the address in the EMULATOR where you want the download to start As an example if the first 255 bytes of the HEX EDITOR buffer need to be downloaded to address 1000h in the emulator the settings below would be used Buffer Start 00000h Buffer End 000 Offset 01000h Once the buffer and offset information have been entered a window will ap
14. at are inexpensive but fully functional If you have any problems or comments please don t hesitate to call or FAX and let us know FlexROM uses SRAM or battery backed SRAM to emulate EPROMS and FLASH up to 4MBits in size An IBM compatible computer PC is used to down load object code into the SRAM CONFIGURATION STATUS LED 1 Pavice Type Cable Size J6 32 Pin Cable Stripe 28 Pin Cable Stripe To Target 1 2 J9 J3 J5 SRAM Mode Feature Target Cable Connector TECHTOOLS FlexROM CABLE SIZE J6 o lI 32 PIN lI 28 2 Figure 1 cable size J6 Set jumper 16 to indicate the size of the target socket This jumper determines which target pin is used to supply power to the FlexROM For 32 pin target cables set the jumper to the 32 position For 28 pin target cables set the jumper to the 28 position The default configuration is for 32 pin targets 27010 or larger DEVICE TYPE J7 J8 J7 J8 J7 J8 II FLASH EPROM Figure 2 device type J7 J8 Jumpers J7 and J8 configure the pinout to match EPROM or FLASH devices Set jumpers J7 and J8 to indicate the type of target memory to emulate If the FlexROM is emulating FLASH set BOTH JUMPERS to the FLASH position To emulate EP
15. bitration schemes 6 16 17 BASIC INSTALLATION 5 16 batchable 9 11 12 buffer 10 11 Bus REQUEST GRANT ARBITRATION 6 17 CABLE SIZE 5 2 CONFIGURATION 5 1 daisy chaining 6 9 22 DEVICE TYPE 5 2 Device Size 5 3 9 DIVIDE EXE 12 DOWNLOADING 5 6 8 9 11 12 13 14 15 18 20 EMULATING 16 bit EPROMS 22 EPROM 5 3 5 EPROM PROGRAMMING CAPABILITY 5 EPROM FLASH SIZE 5 3 error messages 13 14 15 FLASH 5 1 2 3 15 HEX2BIN EXE 8 12 Interrupt 3 7 17 18 19 20 21 IRQ 3 7 17 18 19 20 21 IRQ or BRQ 7 7 5 2 jump 13 7 FlexROM jumper 5 2 3 7 10 17 18 19 20 21 jumper J6 5 2 jumper 19 5 3 7 10 17 18 19 20 21 Jumpers J7 and J8 5 2 LIBRARY REFERENCE 22 LOADING A FILE 5 10 modular cable 13 14 Motorola S 8 OPERATING MODE 5 3 7 10 17 18 19 20 21 PlusEDIT EXE 5 7 9 15 16 22 PlusLOAD EXE 7 9 11 PlusUTIL LIB 16 printer port 5 7 13 14 REQ 3 18 REQUEST GRANT 6 3 17 18 RESET 6 5 6 7 8 10 12 15 16 17 18 19 20 21 RJ 45 5 SEMAPHORE 9 16 18 21 SEMAPHORE SOFTWARE UART 21 Semaphore Byte 6 9 16 18 19 20 21 SEMAPHORE BYTE DEFINITION 9 18 SETUP 5 9 SHUFFLE EXE 12 SOFTWARE 21 SRAM 5 1 3 8 14 15 START ADDRESS 10 SW1 5 3 UART 6 16 20 21 WAIT STATE ARBITRATION 6 17
16. ches To emulate a 1Mbit device turn OFF SW1 1 and SW1 2 ONLY This continues until all switches are OFF for a 64Kbit device This is summarized in Figure 4 see also CONFIGURATION TECHTOOLS FlexROM SW 1 Device Size Settings Figure 4 device size SW 1 NOTE off is the down position TECHTOOLS FlexROM BASIC INSTALLATION Turn power off to the Target 2 IF YOUR TARGET HAS IN CIRCUIT EPROM PROGRAMMING CAPABILITY DISABLE IT The FlexROM is a5 Volt ONLY device Programming voltages will DAMAGE the device and will void the warranty Even short surges during power up or reset be damaging 3 Install target extension cable Install the appropriate DIP cable on the FlexROM If you are emulating a 28 pin EPROM use the 28 pin cable Otherwise use the 32 pin cable In either case the cable should be installed so that the colored stripe on the cable is closest to pin 1 on the emulator Note that both cables terminate into a 34 pin connector Mate this connector with the 34 pin header on the emulator 4 Connect the FlexROM to the target socket BE CAREFUL TO INSERT THE FlexROM CABLE PROPERLY INSERTING THE CABLE BACKWARDS CAN RESULT IN PERMANENT DAMAGE TO THE FlexROM OR THE TARGET SYSTEM Pin 1 of the FlexROM cable is identified by the colored stripe on the edge of the cable Insert the cable so that this stripe aligns with pin 1 of the target connector The target pin 1 is usually identifi
17. d to TARGET write SUMMARY The SEMAPHORE UART implementation provides hardware independent communications between the HOST and TARGET It requires NO ARBITRATION connections and will work with any TARGET that can write to this memory space However it requires software on both ends of the link The remaining SEMAPHORE implementations rely on minimal software but require that the TARGET can execute from code space outside of the memory space occupied by the FlexROM during the HOST accesses Many micro controllers have a limited amount of internal memory that could be used for this Other systems could place a small amount of code in RAM and execute from there The ARBITRATION SHARED MEMORY implementations are completely transparent to the software on both ends and allow each completely random access to the entire memory space at will However they depend on hardware support from the TARGET and one or two additional connections ADDITIONAL NOTES The active levels and drive types TTL OC of REQUEST GRANT and WAIT were selected for common applications If your target requires different drive levels or drive types you may need to add external logic 21 TECHTOOLS FlexROM LIBRARY REFERENCE Refer to the PlusUTIL DOC file on the distribution diskette for full documentation of the PlusUTIL libraries APPENDIX A EMULATING 16 bit EPROMS Two FlexROM s can be combined to emulate 16 bit EPROMS with an ADP16 adapt
18. ed with a dot or a notch in the socket Select an un used printer port on your IBM compatible PC XT AT Plug the supplied DB 25 to RJ 45 converter into the selected port Plug one end of the supplied RJ 45 cable into the adapter Plug the other end of the RJ 45 cable into the FlexROM IN jack 4 TECHTOOLS FlexROM 9 If you daisy chaining 2 or more units together the OUT jack on the first unit should be connected to the IN jack of the second unit In turn the OUT jack of the second emulator would feed the IN jack of the third emulator and so forth Up to 4 emulators may be daisy chained in this manor NOTE The FIRST BYTE in the file will always end up in the LAST EMULATOR in the chain This would be the emulator with only ONE cable attached to it In the case of two emulators the LAST on in the chain would hold the EVEN 0 2 4 bytes and the FIRST one in the chain closest to the PC would hold the ODD 1 3 5 bytes Byte O Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 NOTE The FIRST BYTE in the file will load to the LAST EMULATOR in the chain Figure 5 daisy chaining 10 OPTIONAL Connect a jumper wire between one of the reset pins active high or active low on the FlexROM to the reset circuitry on the
19. er One emulator holds the ODD data D8 D15 and the other one holds the EVEN data DO D7 When used in this configuration the FlexROM s and PlusEDIT need to be configured as follows FlexROM configuration Configure EACH for 1 2 of the total device capacity For example if you are emulating a 27 220 or 27C2048 2Mbit configure EACH FlexROM for 1Mbit SW1 and 2 off 3 6 off PlusEDIT configuration Configure PlusEDIT for 2 EMULATORS each of Y2 the total device capacity For a 27C220 or 27C2048 you would configure PlusEDIT for 2 27010s Connect the FlexROM s to the ADP16 Daisy chain the two emulators together per the manual instructions Connect the LAST emulator in the chain to the DO D7 connector on the ADP16 Connect the remaining emulator to the connector marked D8 D15 on the ADP16 TECHTOOLS FlexROM Table of Figures Figure 1 cable size J6 Figure 2 device type 77 78 Figure 3 operating mode J9 Figure 4 device size SW 1 Figure 5 daisy chaining Figure 6 Feature Connector J3 NWA WN LOH hous TECHTOOLS 972 272 9392 Fax 972 494 5814 email sales tech tools com web www tech tools com ftp ftp tech tools com TECHTOOLS 16 bit 22 28 pin CABLE 2 5 32 pin CABLE 2 5 ABSOLUTE or RESET ARBITRATION 6 16 access time 15 ADDITIONAL HELP 6 15 ADP16 adapter 22 ADVANCED INSTALLATIONS 6 16 Arbitration 6 16 17 21 Ar
20. extention cables switch boxs or security keys dongles Plug the supplied download cable DIRECTLY into the printer port 7 If you do buy a longer modular cable be sure to purchase one that is wired the same as the one provided 8 conductor pin 1 to pin 1 Note that modular cables can be purchased in straight through or cross over configurations 8 Try a different printer port 3 Once the port is verified and the FlexROM responds properly the download is completed If the V flag is used on the command line the contents of the FlexROM is then compared to the contents of the file that was just down loaded If a single byte is different PlusLOAD will stop and report a VERIFY ERROR AT xxxx If you receive this error message check the following 13 TECHTOOLS FlexROM 1 Verify that the download file is NOT larger than the SRAM 2 Have your SRAM checked or try another one 3 Remove any extention cables switch boxs or security keys dongles Plug the supplied download cable DIRECTLY into the printer port 4 If you extended the download cable try removing it If you do buy a longer modular cable be sure to purchase one that is wired the same as the one provided 8 conductor pin 1 to pin 1 Note that modular cables can be purchased in straight through or cross over configurations 6 Try a different printer port or computer Tf the target does not respond as expected after the download and you DID NO
21. nd PlusEDIT EXE a full screen interactive editor on the disk PlusEDIT allows you to edit the file contents before downloading it You can also make patches to the code after it is downloaded For complete descriptions of these programs see SOFTWARE page 9 TECHTOOLS FlexROM ADDITIONAL NOTES 1 Most linker locators will generate Binary files quicker than Intel Hex or Motorola S files Binary files are more compact if your EPROM is over 40 full and therefore download quicker With that in mind we wrote PlusLOAD to use Binary files If your Linker or Locator will only generate HEX files you will need to convert them to Binary before downloading them The UTILITY directory on the DISK contains a utility that will do this conversion for you HEX2BIN EXE will accept Intel Motorola and Tektronics HEX files in 8 24 and 32 bit address formats and convert them to binary Type HEX2BIN without parameters to see the parameter syntax The RESET and RESET outputs are driven by TRI STATED devices They are active during the download only The Emulator and therefore the target must be powered before the object code can be down loaded into it If you use a battery backed SRAM it will retain its information when power is removed However power MUST be applied to the FlexROM before new data can be downloaded into it TECHTOOLS FlexROM SOFTWARE TECHTOOLS has provided two methods of operating your FlexROM
22. pear asking you to wait while the data is downloading to the emulator PLUSLOAD EXE If you want to automate your downloading use Plusload exe allows direct downloading to the emulator by passing the hex editor buffer This is a command line driven batchable downloader Any number of options can be included on a single line but they must be separated by spaces plusload file_name option option All options and defaults can also be seen by typing PLUSLOAD from the DOS prompt without parameters 11 TECHTOOLS FlexROM OPTION DETAIL DEFAULT Printer port address Hex 378 Semaphore byte location 2 0 LOW 1 HIGH 2 DISABLE E Emulator Count 1 4 1 Iv Verify after download no verify 0 Offset in hex 0 M Arbitration Method 0 0 1 READY 2 BUS GRANT FOR EXAMPLE to use parallel port 278h and to request a verification after downloading you would type PLUSLOAD filename p 278 v HEX2BIN EXE This batchable utility enables you to convert Intel Motorola and Tektronixs Hex files to binary supports 8 24 and 32 bit formats For usage and options type HEX2BIN from the DOS command prompt SHUFFLE EXE This batchable utility provides a way to interleave two binary files From the DOS command prompt type SHUFFLE name of even file name of odd file name of output file example shuffle even bin odd bin both bin DIVIDE EXE This batchable utility provides a way to break a binary
23. starting its access If the TARGET then starts another access before the HOST access is complete it will be held off with wait states until the HOST access is complete At that time the WAIT line is released and the TARGET is allowed to complete its access The WAIT line is ACTIVE LOW OPEN COLLECTOR CONNECTIONS MODE IRQ IRQ connected to TARGET IRQ optional WAIT connected to TARGET wait or ready RESET or RESET connected to TARGET reset optional WRITE connected to TARGET write optional Bus REQUEST GRANT ARBITRATION If the TARGET has bus mastering capabilities this can be used for arbitration The REQUEST line from the FlexROM can be connected to a bus request line on the TARGET When the FlexROM needs to access the FlexROM memory space it asserts REQUEST This tells the TARGET that a master wants control of the system The TARGET arbitration circuitry holds off the local processor and generates a GRANT signal This signal is connected to the FlexROM GRANT pin Since the processor is being held off it can not access the FlexROM memory space and will not collide with the HOST access When the HOST has completed its access it will release the REQUEST line relinquishing control to the TARGET processor NOTE IRQ is not available with this type of arbitration 17 TECHTOOLS FlexROM CONNECTIONS MODE REQ REQUEST connected to TARGET bus request GRANT connected to TARGET bus grant
24. t is then used to indicate when access is granted This eliminates the need for the TARGET to constantly poll for requests If the interrupt routine is located in a memory space out side of the emulator space it could immediately grant the HOST access to the memory CONNECTIONS MODE IRQ connected to TARGET interrupt WAIT n c RESET or RESET connected to TARGET reset optional WRITE connected to TARGET write SEMAPHORE SOFTWARE UART Use the semaphore bits to implement a software UART In this approach the HOST never accesses the memory space directly except during the initial download Commands are sent serially through the semaphore byte to the TARGET The target responds serially back through the semaphore byte The routines could use 1 bit for data and another bit for handshake data ready data received This method is particularly suited for micro controllers that can not execute out of other memory space do not have ready wait lines and do not have bus request grant lines The only requirement is that they can WRITE to the EPROM space 20 TECHTOOLS FlexROM Since the memory space is not being accessed directly by the HOST there is no need for arbitration The IRQ line could be used to interrupt the TARGET when a valid data bit is ready from the HOST CONNECTIONS MODE IRQ IRQ connected to target IRQ optional WAIT n c RESET or RESET connected to TARGET reset optional WRITE connecte
25. ts full dual port accesses without any external arbitration support We call this a communications port or a SEMAPHORE byte This location can be set to offset 0 or offset Ox7ffff within the emulator s memory space It can also be disabled default The correct configuration for each of these features is documented below ABSOLUTE or RESET ARBITRATION If no arbitration is selected the FlexROM will ALWAYS arbitrate for the HOST This is the method used by the download program If the target and HOST collide the HOST will complete a valid cycle and the target will retrieve garbage The RESET lines can be used to hold the target in reset during the operation if desired This is the fastest method of accessing the FlexROM because it does not have to arbitrate for each access If your application will need to be reset after the access like in a code change or if an occasional miss read of the data is acceptable as in some look up tables then this is the fastest and simplest method requiring no extra connections 16 TECHTOOLS FlexROM CONNECTIONS MODE IRQ WAIT n c IRQ n c RESET or RESET connected to TARGET reset optional WRITE connected to TARGET write optional WAIT STATE ARBITRATION If the TARGET has wait state circuitry this can be used to effect arbitration The WAIT line on the FlexROM is connected to the WAIT line on the TARGET The FlexROM will wait for any TARGET access to complete before
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