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1. 1 2 UU T T 1 2 Me conan 1 2 SPECIFICATIONS 2 1 VRROSPCEU BOI CONV nO ipM Idm ed nid 2 1 FSAFPCFUGP SRECNE ONIY iens tn msi dO Ub nni C PR PRA Eau 2 3 5 3 1 3 1 Connector Pinout TPR 3 2 Time Code INDUCBNG Connector 3 3 IRIG B Output BNC Connector J 2 RV oA n o Fi 3 3 2555455559 Ou EROR CAPE EROR 4 1 E OT 4 1 4 1 5 5 1 GPS Receiver Antenna TSAT PCI U ODDS necati ara Pia E dolis aa ei 5 1 Installing the Board in the Om 5 1 BOARD OPERATION eee Neo E E EEE 6 1 6 1 fi 6 2 PROGRAMMING 7 1 Geheraklbfor atelier cibos EA v ER 7 1 Mibi Rees oT OREL 7 2 1 3 AEN 1 3 Sending Goltiialld5 vasto peg
2. _ 1254 _2 0 2 7 1 Ew Refer to Section 8 Options and Accessories for more information 22 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCL U 3 3 Time Code Input BNC Connector J1 The timecode input BNC connector is located nearest the 15 pin D type connector 3 4 IRIG B Output BNC Connector 12 The IRIG B output BNC connector is located farthest from the 15 pin D type connector Synchronizable Timecode Generator User Manual pu TPRO PCIU TSA T PCI U 3 4 Corporation Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCL U 4 Configuration 4 1 Base Address The host computer s PCI BIOS software configures the base address 4 2 Interrupt Request Level The host computer s PCI BIOS software configures the interrupt request IRQ level Synchronizable Timecode Generator User Manual 4 1 TPRO PCIU TSA T PCI U 4 2 Corporation Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U 5 Installation 5 1 GPS Receiver Antenna TSAT PCI U Only The mounting location should be free of objects that could obstruct satellite visibility from straight overhead to within 20 degrees of the horizon in all directions Obstructions that block a significant portion of the sky resu
3. 7 4 Setting the Clock Time Not Applicable to Option M ee nnn 1 5 Setting the Clock Time TPRO PCI U Option M nnn 1 1 Setting the Year Not Applicable to Option 0 0 7 8 Reading the Year Gregorian Date and Altitude Not Applicable to Option 1 8 Report Longitude TSA TPE FU ONIY nuc dace Ra 7 9 7 10 Report Number of GPS Satellites Being Tracked TSAT PCI U 1 10 xa 1 11 Readings COIS CCN iade utt Ek titm Ripa AN 7 11 1 12 Setting the Propagation Delay teil un 1 13 Setting the Start Stop Match Times Not Applicable to Options FXA FXB or HDRV 7 13 Programming the Heartbeat Output Not Applicable to HB1PPS FXA FXB LOR1 Options 7 14 Programming the Heartbeat Output For Options HB1PPS FXA FXB and LOR1 Only 7 15 TIR 7 15 PITT 1 17 Synchronizable Timecode Gene
4. 0x0062 0x0070 0x0080 0x0093 Ox00ea The year is reset to 0000 when power is first applied or when any of the following occur system reset firmware reset command Ox004f or writing to the Assert Reset or De assert Reset addresses 7 9 Reading the Year Gregorian Date and Altitude Not Applicable to Option M The GPS receiver s computations for the altitude TSAT PCI U only and Gregorian date TSAT PCI U TPRO PCI U are reported in the FIFO in response to the 0 005 command Altitude is in units of meters relative to mean sea level my s 5 io meters imeem _ mees meters _ 10 meters s 9 Over 10 Year 10 Month 8 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U The board increments the Gregorian date approximately one second after time rolls over from 23 59 59 to 00 00 00 HH MM SS This occurs on every date in every year Consequently the Gregorian date should not be used during minutes 59 and 00 this will avoid rollover problems 7 10 Report Longitude TSAT PCI U Only The GPS receiver s computation for longitude is put into the FIFO in response to the 0x005e command The units are degrees minutes and fractions of minutes The response is in the following format Wes Bisra _ ome 5 e a s 3 o Wege Dewees Degrees
5. iU Minutes _ s i Minutes 10minutes 10 Minutes i Mnues s Reseed Reserved NOTE f the reported value is less than 180 degrees the longitude is East for Europe Africa Asia etc If the reported value is greater than or equal to 180 degrees subtract 180 degrees to obtain west longitude for USA Canada Central amp South America etc For example the reported value for Los Angeles CA USA will be approximately 298 degrees Since this is greater than 180 subtract 180 to get the correct value i e 118 degrees West Be sure to convert minutes to decimal degrees before comparing to 180 degrees Synchronizable Timecode Generator User Manual 7 9 TPRO PCLU TSAT PCI U Spectracom Corporation 7 11 Report Latitude TSAT PCI U Only The GPS receiver s computation for latitude is put into the FIFO in response to the 0 0051 command The units are degrees minutes and fractional minutes Latitudes north of the equator are reported as 0 90 degrees latitudes south of the equator are reported as 180 degrees South i e if the reported value is greater than or equal to 180 subtract 180 degrees and change the sign to negative south It is important to convert minutes to decimal degrees before comparing to 180 degrees The response is in the format shown here 4 Bisso 0 fret 2 s Pe Rosemead Reserved _ 7 12 Report N
6. TPRO PCLU TSAT PCI U Spectracom Corporation NOTE f both 1PPS and Timecode inputs are present the board will sync to the incoming timecode and ignore the 1PPS Commands 0 0044 and 0 004 Enable Disable Sync apply both to the 1PPS and the timecode input Commands 0 00 0 set clock and set year are not applicable to boards with Option M The user s software must ensure that the commanded values are in the appropriate ranges The board does not error check the data before loading the clock Commanding invalid values e g 39 hours will cause erratic operation 7 8 Setting the Year Not Applicable to Option M Whether the IRIG B output is synchronized to GPS or timecode or is freewheeling it counts from day 365 to day 001 unless the year is set to a leap year Once set to a leap year the IRIG B output counts from 365 to 366 then to 001 The TSAT PCI U acquires the year from the GPS satellites The year can also be set by command if the GPS receiver is not connected To function properly the TPRO PCI U requires that the year be set by command at the end of a leap year The board will increment the year when the day rolls over to 001 Also setting the year enables the board TPRO PCI U and TSAT PCI U to compute the Gregorian date using the year and Julian date Set the year by sending the command sequence 0x006n 0x007n 0 008 0x009n Ox00ea to the command port For example to set the year to 2003 send
7. Time NOTE f no timecode input is present TPRO PCI U or the GPS receiver is not tracking satellites TSAT PCI U the board will accept the time set sequence described above and continue to increment time freewheel However when a valid timecode TPRO PCI U is input or when the GPS receiver begins tracking satellites TSAT PCI U the clock s time will jump to the decoded time unless the above sequence was preceded with a Disable Sync command described later in this chapter While freewheeling the In Sync status bit will be false The user s software must ensure that the commanded values are in the appropriate ranges The board does not error check the data before loading the clock Commanding invalid values e g 39 hours causes erratic operation 7 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U 7 7 Setting the Clock Time TPRO PCI U Option M Only Set the clock time by commanding the days hours minutes and seconds The milliseconds and microseconds cannot be commanded they are reset to 000000 when the next 1PPS occurs The clock time of the next 1PPS is commanded to the board It is necessary to load the time into the Holding Register First send a command to clear the Holding Register Then one at a time write each digit hundreds of days down to ones of seconds into the Holding Register There is a separate command for loading each of these digits The upper 4 bi
8. processing commands The actual amount of time needed to process a command depends on when the command was received relative to the on board time Entries in Chapter Six specify the amount of time needed to assure that the command was received There is no restriction on reading from the board Each 16 bit word is located on an even address Although many of the registers use only eight bits always read and write registers as 16 bit entities Do not attempt an 8 bit access on an odd address location Synchronizable Timecode Generator User Manual Spectracom Corporation 7 2 Register Locations Table 7 1 Register Locations Base 008 Base roroa Clock M H _ Base 0x06 Clock Seconds Base Ok ImStwough tus Base 0x12 Simulate Time Tag mu meson Hn meom fH n Burda mero Base 0x3a lt Base Base H Reserved for future use 72 Synchronizable Timecode Generator User Manual Spectracom Corporatio
9. that has thirty two consecutive 16 bit memory locations 64 bytes and thirty two consecutive 16 bit I O locations 64 bytes During startup the PCI BIOS part of the host computer mapped these locations somewhere in the absolute address space thirty two memory locations and the thirty two locations serve exactly the same functions In actual use only one of these either memory or I O is used the other is ignored On host computers with Intel CPUs e g Pentium 486 etc use the I O locations host computers with Motorola CPUs e g the 68000 family use the memory locations since Motorola does not have I O instructions The locations of the board s registers are specified as Base Offset The offsets are constants as described in the next section The Base is chosen by the PCI BIOS during startup There is a separate Base for the memory and locations Time is read as four 16 bit words and is in binary coded decimal format Status is read as a single 16 bit word Time tags and for the TSAT PCI U GPS information longitude latitude altitude and Gregorian date are read by first sending a command to the board then reading ten 16 bit words from a first in first out FIFO register The user s software must wait a short amount of time after sending each command This admittedly cumbersome requirement is necessary because the on board processor places a higher priority on maintaining the time than on
10. 0 Seconds Copy Holding Register to Stop Time 107 to 10 Seconds Copy Holding Register to Heartbeat Pulse Mode immediately Copy Holding Register to Heartbeat Square wave Mode at next period Copy Holding Register to Heartbeat Square wave Mode immediately 7 6 Setting the Clock Time Not Applicable to Option M Set the clock time by commanding the days hours minutes and seconds The milliseconds and microseconds cannot be commanded they reset to 000000 when the command is sent It is necessary to load the time into the Holding Register First send a command to clear the Holding Register Then one at a time write each digit hundreds of days down to ones of seconds into the Holding Register Synchronizable Timecode Generator User Manual TPRO PCLU TSAT PCI U Spectracom Corporation There is a separate command for loading each of these digits The upper 4 bits of the command identify which digit is being loaded the lower 4 bits contain the actual data to load Once all the digits have been loaded a command is sent to set the time the board does this by copying the Holding Register into the clock For example to set the clock to day 123 hour 11 minute 58 second 17 send the following sequence of commands to the Command Port Clear the Holding Register 0 0051 0 0062 0x0073 Day 123 0 0081 0 0091 Hour 11 0 00 5 Ox00b8 Minute 58 0 00 1 0x00d7 Seconda 17 0 00 0 Set Clock
11. 3 pin header is located on JP11 Pins 6 7 and 8 The 3 pin header designations are e JP11 Pin 6 is 1MHZ JP11 Pin 7 is 1PPS e JP11 Pin 8 is Ground 8 1 6 M TPRO PCI U Only Option M synchronizes to an external 1PPS input instead of the standard IRIG timecode input The external 1PPS signal is connected to Pin 15 of the DB15 connector P1 Ground is connected to either Pin 5 or Pin 7 of the connector The timing card will detect the presence of the 1PPS signal automatically so no configuration changes are required for the card to use the 1PPS signal The presence of the 1PPS signal is indicated by the onboard LED LED1 status pattern Refer to Table 5 1 for more information concerning LED flash patterns 9 2 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U 8 2 Accessories 8 2 1 GPS Optic Isolator This option provides fibre optic technology for voltage secure environments 8 2 2 GPS Cables Contact Spectracom for more information on GPS cable length options Synchronizable Timecode Generator User Manual 8 3 TPRO PCIU TSA T PCI U 8 4 Corporation Synchronizable Timecode Generator User Manual TPRO PCLU TSAT PCI U Spectracom Corporation 9 Driver Support Please contact your sales representative for information about Spectracom s bus level timing board driver support for Windows Linux VxWorks and a variety of other platforms You may also visit our
12. LITY OR FITNESS FOR A PARTICULAR PURPOSE Spectracom shall have no liability or responsibility to the original customer or any other party with respect to any liability loss or damage caused directly or indirectly by any Spectracom product material or software sold or provided by Spectracom replacement parts or units or services provided including but not limited to any interruption of service excess charges resulting from malfunctions of hardware or software loss of business or anticipatory profits resulting from the use or operation of the Spectracom product or software whatsoever or howsoever caused In no event shall Spectracom be liable for any direct indirect special or consequential damages whether the claims are grounded contract tort including negligence or strict liability EXTENDED WARRANTY COVERAGE Extended warranties be purchased for additional periods beyond the standard five year warranty Contact Spectracom later than the last year of the standard five year warranty for extended coverage SPECTRACOM 95 Methodist Hill Drive Rochester NY 14623 1 585 321 5800 FAX 1 585 321 5218 www spectracomcorp com sales spectracomcorp com Spectracom Corporation TPRO PCHU TSAT PCIU 1 21 Table of Contents OVERVIEW 1 1 GeherarIprommason 1 1 Tour 5Decmaeorm A E 1 2 Distinguishing Between TPRO amp TSAT PCI U Boards 50
13. TPRO PCI U TSAT PCI U SYNCHRONIZABLE TIMECODE GENERATOR with UNIVERAL PCI BUS INTERFACE User Manual 95 Methodist Hill Drive Rochester NY 14623 Phone US 1 585 321 5800 Poa 5210 www spectracomcorp com Part Number 1 159 5001 0050 Manual Revision B 22 May 2007 Copyright 2007 Spectracom Corporation The contents of this publication may not be reproduced in any form without the written permission of Spectracom Corporation Printed in USA Specifications subject to change or improvement without notice Spectracom NetClock Ageless TimeGuard TimeBurst TimeTap MultiTap Versalap and legally Traceable Time are Spectracom registered trademarks All other products are identified by trademarks of their respective companies or organizations All rights reserved SPECTRACOM LIMITED WARRANTY LIMITED WARRANTY Spectracom warrants each new product manufactured and sold by it to be free from defects in software material workmanship and construction except for batteries fuses or other material normally consumed in operation that may be contained therein AND 5 NOTED BELOW for five years after shipment to the original purchaser which period is referred to as the warranty period This warranty shall not apply if the product is used contrary to the instructions in its manual or is otherwise subjected to misuse abnormal operations accident lightning or transient surge repairs or modifica
14. ax at 5 Vin 12 mA max at 16 Vin Rise Fall Time 500 nS max Trigger Edge apps Accuracy Must be 100 ppm or better H One pulse per second Synchronizable Timecode Generator User Manual 2 Corporation TPRO PCHU TSAT PCIU Table 2 5 Match Output Specifications Output Voltage Setability 3 8 V min at 6 mA high 0 4 V max at 6 mA low Table 2 6 On board Clock Specifications Resolution Range Date Format Synchronization Time Stability Disciplined to timecode 1x10 Undisciplined 2x10 Table 2 7 PCI U Interface Specifications PCI Spec 2 2 compliant General Occupies 32 consecutive 16 bit and memory addresses 64 bytes Chipset Vendor ID 0 1065 PLX Technology Inc Chipset Product ID 0x9030 PLX 9030 Chip Subsystem Vendor ID 0x1347 Spectracom Subsystem Product ID Size Power from PCI bus TPRO PCI U 0x9050 standard TPRO PCI U M 0 9051 TPRO PCI U HB1PPS TPRO PCI U FXB TPRO PCI U LOR1 0x9052 TPRO PCI U M HB1PPS 0x9053 TSAT PCI U 0x9070 standard TSAT PCI U HB1PPS 0x9072 TSAT PCI U FXA 0x9072 Table 2 8 General Specifications H 106 7 mm L 174 6 mm H 4 2 L 6 875 5 VDC 425 mA max 12 VDC 225 mA max 12 VDC 50 mA max Operating Temperature 30 to 70 C 22 to 158 F Storage Temperature 40 to 80 C 40 to 176 F Connectors 22 BNCs for timecode input and output DB15 socket for timecode input out
15. ble Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U 7 21 Report Firmware Version The version of the embedded firmware is reported in the FIFO in response to the 0 00 9 command For example firmware version 7A104221 is reported as shown below O first 4 o Uwe Umen _ s mmo NOTE The Firmware version is for diagnostic purposes only It is not possible to determine which options are present or which version is more recent by examining the version number 2 The firmware version is also printed on the label on device U19 Some older boards ignore the 0x00e9 command 7 22 Clear Flags Port Once the Match and or Heartbeat flag s get set it is necessary to clear the flag by writing a 1 to the appropriate bit of this register at location Base 0x10 Table 7 6 Interrupt Control Port Bit Definitions Bi Action WiigiAcin _ _ Clear Match Match flag does not change Clear match flag to zero Clear Heartbeat Heartbeat flag does not change Clear heartbeat flag to zero Reserved Reserved Reserved NOTE f used as an interrupt the user s software must clear the Match Flag each time the otart time occurs Failure to do so will result in missed interrupts if enabled until the flag is cleared If used as an interrupt the user s software must be fast enough to clear the Heartbeat Flag each time a heartbeat occurs Failure to
16. ble for knowing what each of the responses is During initialization the user s software must flush the FIFO Do this by reading the FIFO until the FIFO Ready flag is a one This could take up to 512 reads maximum Responses to user commands echo the command in the first two words from the FIFO This can be useful in sorting out multiple responses that are stacked up in the FIFO 7 44 Reading Clock Time The current clock time is read as four 16 bit words Reading the first word latches all four words thus the latency time between reading them does not affect the accuracy This also means that it is important to read the least significant word first as this causes the other words to be latched It is not necessary to read all four words if the application does not need the complete clock time NOTE These locations are read only A different sequence is used to set the time Refer to the sections on setting the clock time It is also necessary to examine the status register to determine if the time is valid The Julian date not the Gregorian date is reported The value range for Days is 000 366 Be sure the variable that stores Days can accommodate this range Assigning Days to an 8 bit integer with a range of 000 255 produces an unpleasant surprise in mid September Within each 16 bit word there are four nibbles groupings of 4 bits each Each nibble is decoded separately representing a single binary coded decimal Ba
17. claim with full information as to the claimed defect Spectracom products shall not be returned unless a return authorization number is issued by Spectracom Spectracom products must be returned with the description of the claimed defect and identification of the individual to be contacted if additional information is needed Spectracom products must be returned properly packed with transportation charges prepaid Shipping expense Expenses incurred for shipping Spectracom products to and from Spectracom including international customs tees shall be paid for by the customer with the following exception For customers located within the United States any product repaired by Spectracom under a warranty repair will be shipped back to the customer at Spectracom s expense unless special taster delivery is requested by customer Spectracom highly recommends that prior to returning equipment for service work our technical support department be contacted to provide trouble shooting assistance while the equipment is still installed If equipment is returned without first contacting the support department and no problems are found during the repair work an evaluation fee may be charged EXCEPT FOR THE WARRANTY STATED ABOVE SPECTRACOM DISCLAIMS ALL WARRANTIES OF ANY KIND WITH REGARD SPECTRACOM PRODUCTS OR OTHER MATERIALS PROVIDED BY SPECTRACOM INCLUDING WITHOUT IMPLIED WARRANTY MERCHANTABI
18. command To send the Disable Sync command write 0 004 to the command port To send the Enable Sync command write 0 0044 to the command port The power on default is to Enable Sync 7 14 Reading the Status Register The Status Register consists of one 16 bit word of which only the lower 8 bits are used The Status Register is read from location Base 0x02 and is formatted as shown in Table 7 4 Table 7 4 Status Register Format Bit Meaning When o _ MeanigWhen i Ea FIFO Ready Flag FIFO Ready data available FIFO empty Timecode Present 2 Timecode input has signal present 2 In svnc Fla Clock is freewheeling GPS position is Clock is synced to timecode or GPS y 9 invalid and GPS position is valid Match Flag Start time has not occurred Start time has occurred Heartbeat Flag Heartbeat has not occurred Heartbeat has occurred 5 Heartbeat Int Mask PCI bus interrupt disabled for heartbeat bus interrupt occurs on each heartbeat Match Int Mask PCI bus interrupt disabled for start time bus interrupt occurs the start FIFO Ready Int Mask PCI bus interrupt disabled for FIFO PCI bus interrupt occurs when FIFO y available available NOTE Bit 2 In Sync Flag is the only bit to examine when determining the validity of the time and position for TSAT PCI U Bit 1 Timecode Present is for diagnostic purposes only lt indicates only that the ampli
19. ctracom Technical Support at US 585 321 5823 or US 585 321 5824 CAUTION Electronic equipment is sensitive to Electrostatic Discharge ESD Observe all ESD precautions and safeguards when handling the timecode generator NOTE f equipment is returned to Spectracom it must be shipped in its original packing material Save all packaging material for this purpose NOTE n this manual the prefix Ox indicates that the number is in hexadecimal Base 16 format 1 2 Synchronizable Timecode Generator User Manual Corporation 2 Specifications TPRO PCIU TSAT PCI U 2 1 Board Only Table 2 1 Time Code Input Specifications Code Format autodetect Amplitude Polarity Modulation Ratio Input Impedance Timing Accuracy Common Mode Voltage IRIG A A132 IRIG B B122 NASA36 1 2 Vp p min 8 0 Vp p max Detected automatically 2 1 min 3 1 typical 4 1 max gt 10 K ohms Better than 100 ppm not suitable for tape playback Differential input 100 V max Table 2 2 IRIG B Output Specifications Code Format Amplitude mark Modulation Ratio Output Impedance IRIG B B122 2 6 Vp p type 3 1 600 ohms Table 2 3 Time Tag Input Specifications Input Voltage 0 5V min 0 8V max for logic 0 2 0V min 5 5 max for logic 1 Tags rising edge Table 2 4 1 PPS Sync Input Specifications Option M Only Input Voltage 2 4 V min 16 0 V max high 500 m
20. do so will result in missed interrupts if enabled until the flag is cleared Synchronizable Timecode Generator User Manual TPRO PCLU TSAT PCI U Spectracom Corporation 7 23 Reset Firmware CAUTION This command is for diagnostic purposes only It should not be used during normal operation Writing 4 to the command port causes the embedded firmware to reset This command does not reset the hardware or the PCI bus interface Wait at least eight seconds after sending this command before commanding or interrogating the board 7 24 Assert De assert Reset These commands are for diagnostic purposes only Sending the Assert Reset command holds the hardware reset signal on the board in the asserted state This stops the on board CPU and clears the interrupt masks and Match and Heartbeat Flags The only command that the board will respond to in this state is the De assert Reset command PCI bus interface is not affected Send the Assert Reset command by writing any data value to location Base 0x06 Send the De assert Reset command by writing any data value to location Base 0x04 Wait at least eight seconds after sending the De assert Reset command before commanding or interrogating the board NOTE After the Assert Reset command is sent the diagnostic light on the rear panel stops flashing it may be either lit or not lit This can be used as an indication to determine if the user s software is capable of writing to
21. e of pulse rates as the HB1PPS Option The 15 pin D type connector provides the Heartbeat Output on Pin 6 normally low pulses high and Pin 8 normally high pulses low The rising edge of Pin 6 falling edge of Pin 8 is on time The pulse width is approximately 1 mS The power on default pulse rate is once per second 1PPS The Match function can still be used to provide an interrupt if desired However the Match Output Pin has been eliminated There are no jumpers installed on Header JP9 8 1 4 FXB TPRO PCI U Only Cannot Be Combined with Options HB1PPS HDRV This option provides an RS 422 driver for the Heartbeat Output and provides the same range of pulse rates as the HB1PPS Option 15 pin D type connector provides the Heartbeat Output on Pin 6 normally low pulses high and Pin 8 normally high pulses low The rising edge of Pin 6 falling edge of Pin 8 is on time The pulse width is approximately 1 mS The power on default pulse rate is once per second 1 5 The Match function can still be used to provide an interrupt if desired However the Match Output Pin has been eliminated There are no jumpers installed on Header JP9 Synchronizable Timecode Generator User Manual 8 TPRO PCLU TSAT PCI U Spectracom Corporation 8 1 5 1 This option provides the board with three different outputs three pin header 1 Megahertz Output 1MHZ 1 Pulse Per Second Output 1PPS and a Ground Output The
22. egister is then loaded into the FIFO An interrupt on the PCI bus is generated if enabled The user s software establishes that a time tag has occurred in one of two ways either by examining the least significant bit of the Status Register FIFO Ready flag to determine if it is a zero or by waiting for an interrupt Since the clock time is latched when Synchronizable Timecode Generator User Manual 2519 TPRO PCLU TSAT PCI U Spectracom Corporation the rising edge occurs the Time Tag data will be correct regardless of how long it takes to read the FIFO For test purposes a time tag event can be simulated by writing any value to Base 0x12 The result is indistinguishable from a time tag event on 1 Pin 4 The FIFO response to either of these events is shown here 9 1 senes For example if the time tag occurs at day 123 hour 11 minute 58 second 17 456789 the contents read from the FIFO will be Word Contents O first OxUUOO U Unknown 1 OxUUOO 2 OxUUO1 3 OxUU23 4 0 0011 5 OxUU58 6 OxUU17 7 OxUU45 8 OxUU67 9 last OxUU8 9 NOTE The Julian date not the Gregorian date is reported Erratic operation may result if the rate of the time tags exceeds 1000 per second There may be a delay of up to 200 uS before time tag data is available in the FIFO Some older boards repeated words 2 and 3 in bytes 0 and 1 respectively LAO Synchroniza
23. ilable in 100 foot lengths The maximum total length is 500 feet The connectors on the extension cables are not weatherproof only the first 100 feet can be outdoors The cable consists of several twisted pairs not coaxial cable and a foil shield NOTE Spectracom recommends applying an appropriate silcon grease to the cable connection at the GPS antenna in order to protect the connection from moisture An additional weatherproofing kit P N 221213 containing butyl rubber and plastic tape is also available from Andrews Corporation US 800 255 1479 1 3 Distinguishing Between amp TSAT PCI U Boards Software Examine the Subsystem Product ID number that is detailed in the Specifications section of Chapter Two 1 4 Inventory Before installing the board please verify that all material ordered has been received The TSAT PCI U is delivered with a 100 foot cable with pre installed connectors a GPS receiver antenna housed together in a single enclosure and a user manual The TPRO PCI U is delivered with mating connector 15 pin and a user manual If there is a discrepancy please contact Spectracom Customer Service at US 585 321 5800 1 5 Inspection and Support Unpack the equipment and inspect it for damage If any equipment has been damaged in transit please contact Spectracom Customer Service at US 585 321 5800 If any problems occur during installation and configuration of your Spectracom product please contact Spe
24. ion WireColor User Connection _ oo 3 3 wm o a S i Tart 5 6e __ ___ Heartbeat output Synchronizable Timecode Generator User Manual 3 TPRO PCLU TSAT PCI U Spectracom Corporation The antenna cable wires are twisted pairs as follows Red with Black Pins 3 and 5 Orange with Violet Pins 12 and 13 Yellow with Brown Pins 10 and 11 Green with Pins 15 and None Orange White with Black White Pins 9 and 14 NOTE The following antenna cable wires are connected at the antenna end but NOT at P1 _ S Wie The pigtail on the 15 pin end of the cable is used for custom options if any 3 2 Connector Pinout TPRO PCI U Only The timecode input can be applied either to Pins 1 and 2 of P1 or to the J1 BNC connector this is the connector closest to P1 The timecode input is a differential signal i e timecode input is isolated from ground It is acceptable to connect timecode input to ground The IRIG B output can be taken either from Pin 9 of P1 or from the J2 BNC connector this is the connector farthest from P1 The IRIG B output is a single ended signal i e it is referenced to ground Pren Fe Wmemema
25. lt in degraded performance Specifically the GPS receiver can track fewer than four satellites which would prevent it from obtaining time synchronization To optimize timing accuracy the GPS receiver attempts to track satellites that are spread out as far as possible across the sky The GPS receiver antenna must be mounted with the connector side pointing down and must be spaced at least 39 inches 1 meter away from other GPS antennas Mount the antenna at the desired location Connect the round end of the supplied cable to the antenna Take appropriate lightning precautions as necessary NOTE Spectracom recommends applying an appropriate silcon grease to the cable connection at the GPS antenna in order to protect the connection from moisture An additional weatherproofing kit P N 221213 containing butyl rubber and plastic tape is also available from Andrews Corporation US 800 255 1479 5 2 Installing the Board in the Computer Shut the computer down then turn its power switch off and unplug the line cord Open the computer and install the board in any unused PCI slot CAUTION Observe all ESD procedures when handling the board and the computer Before installing the board discharge static buildup by touching the metal frame of the computer with one hand and the protective bag containing the board with the other hand Open the protective bag only after static buildup has been safely discharged Remove the metal plate at the desi
26. n 1 mS To specify the rate or frequency compute the divide number N as follows To specify a period for a pulse or square wave compute N as follows N t 001 t is the period in seconds To specify a frequency for a pulse or square wave compute N as follows N 1000 F F is the frequency in Hertz Verify that the computed value is in the range of 2 to 65 534 inclusive Convert N into hexadecimal Base 16 notation For example if the desired output period is once every 25 seconds N 25 000 Base 10 converted to hexadecimal notation yields N 0x61a8 Send the hexadecimal number to the board by outputting the following sequence to the command register Clear the Holding Register 0x00a6 0x00b1 0 00 0 00 8 Specifies 0x61a8 The heartbeat output can be programmed for a square wave or a pulse and can be programmed to start immediately or at the beginning of the next cycle Send one of the following commands to command port 0x00e5 Pulse mode starts at beginning of next cycle 0x00e6 Pulse mode starts immediately 0x00e7 Square wave starts at beginning of next cycle 0x00e8 Square wave starts immediately The heartbeat output is present regardless of whether the board is in sync or freewheeling The power on default is 1PPS pulse mode 7 20 Using the Time Tag Input When the rising edge of the Time Tag Input P1 Pin 4 occurs the clock time is latched into a temporary register and this r
27. n TPRO PCLU TSAT PCI U 7 3 Using the FIFO The board uses a FIFO register to provide multi word responses Each of these responses consists of ten 16 bit words of which only the lower 8 bits are actually used A bit in the Status Register indicates whether data is ready in the FIFO The user s software must check that status bit before reading each word from the FIFO There can be a delay of up to 200 uS before all ten words are written into the FIFO This is due to the fact that although the on board CPU writes this data it also maintains the time days through milliseconds in software and places a higher priority on maintaining the time than on filling the FIFO Thus it is not uncommon that for example only three of the ten words are written into the FIFO then following a substantial delay the remaining seven words are written The user s software must allow for such operation i e it must not give up just because it has not read all ten words before the status indicates that the FIFO is empty Either wait 200 uS before beginning to read or allow for enough retries if FIFO empty status is detected prematurely To check the FIFO Ready flag read the Status Register at Base 0x02 If the least significant bit is a zero there is data in the FIFO If this bit is a one the FIFO is empty The FIFO holds 512 words i e 51 responses Letting these responses stack up in the FIFO is acceptable but the user s software is responsi
28. ng decoded If using 1PPS set NEXT 1PPS TIME command sequence has been performed Used for Option M only 5 GPS satellite receiver is tracking enough satellites for accurate UTC time a 1 PPS pulse from GPS satellite receiver is bad In applications with modulated timecode inputs only this status bit will always be set No serial data being received from GPS satellite receiver In applications with modulated timecode inputs only this status bit will always be set GPS satellite receiver is not tracking enough satellites for accurate UTC time In applications with modulated timecode inputs only this status bit will always be set Timecode input not decodable In applications without modulated timecode inputs this status bit will always be set Waiting for SET NEXT 1PPS TIME command Used for Option M only Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U 6 Board Operation 6 1 TSAT PCI U The TSAT PCI U acquires time from the GPS satellites synchronizes its on board clock to this time and provides an IRIG B output from the on board clock GPS consists of a set constellation of approximately 30 These satellites are in relatively high circular orbits are inclined about 55 degrees relative to the equator and circle the Earth approximately once every 12 hours Consequently several satellites are above the horizon at all times anywhere on Earth The recei
29. notation For example if the desired output frequency is 10 kHz N 300 Base 10 converted to hexadecimal notation yields N 0x012c Send the hexadecimal number to the board by outputting the following sequence to the command register Clear the Holding Register 0 00 0 0500671 0 00 2 Specifies 0 012 heartbeat output be programmed for square wave a pulse and programmed either to start immediately or at the beginning of the next cycle Send one of the following commands to command port 0 00 5 Pulse mode starts at beginning of next cycle 0 00 6 Pulse mode starts immediately 0x00e7 Square wave starts at beginning of next cycle 0 00 8 Square wave starts immediately The heartbeat output is present whether the board is in sync or is freewheeling The power on default is 100 PPS pulse mode Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U 7 19 Programming the Heartbeat Output For Options HBIPPS FXB and LORI Only The heartbeat output P1 Pin 6 can be programmed to be either a pulse or a square wave The specified rate must be an exact multiple of 1 000 mS The range of programmable rates is Minimum Rate lowest frequency 65 534 Seconds 0 0152593 Hz Maximum Rate highest frequency 2mS 500 Hz Pulse Width time low pulse mode only 1 mS typical Programming Resolutio
30. onizable Timecode Generator User Manual 6 TPRO PCLU TSAT PCI U Spectracom Corporation The on board clock continues to increment time freewheel while not tracking satellites When power is first applied time begins freewheeling from 000 00 00 00 then jumps to the correct time when synchronization is established 6 2 TPRO PCI U The TPRO PCI U acquires time from the timecode input synchronizes its on board clock to this time and provides an IRIG B output from its on board clock The timecode input consists of an amplitude modulated sine wave carrier frequency is 1 kHz for IRIG B or 6 or 10 kHz for IRIG A The code format is detected automatically The board does not significantly load the timecode input and since it is a very low frequency cable impedance mismatches do not significantly degrade the signal either Thus a single timecode source can drive at least 10 inputs Cable termination is not necessary cable length can be up to several hundred feet and a variety of cable types can be used Usually coaxial cable RG 58 or RG 59 type with BNC connectors is used Multiple boards can be driven by placing a BNC T connector at each board and connecting the timecode input in a daisy chain configuration For another approach take the IRIG B output from one board to the timecode input of the next board i e a loop through configuration The advantage of the loop through configuration is that if the signal is lost a
31. put heartbeat output match output time tag input and 1 PPS input Synchronizable Timecode Generator User Manual Spectracom Corporation Table 2 9 Heartbeat Output Specifications 3 8 V min at 6 mA high Output Voltage 0 4 V max at 6 mA low Wave Shape Pulse or Square Wave programmable Pulse Width 150 nS min 450 nS max 2 2 TSAT PCI U GPS Receiver Only Acquisition Time cold start 1575 MHz receive only L1 band C A code SPS 25 m SEP w o SA 82 feet Synchronizable Timecode Generator User Manual 2 9 Spectracom Corporation TPRO PCLU TSAT PCL U 24 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCHU TSAT PCIU 3 Pinouts The accompanying figure illustrates pinouts for both the TSAT PCI U and the TPRO PCI U P1 DB15 Connector Top Row L R 8 7 6 5 4 3 2 1 OX o7 P1 DB15 Connector Bottom Row L R 15 14 13 12 11 10 9 3 1 Connector Pinout TSAT PCI U Only The GPS receiver antenna cable plugs into the 15 pin P1 connector In addition some pins may interface to the user s equipment It is the user s responsibility to modify the antenna cable connector if necessary to access the User Connection pins A description of the pinout for the supplied cable is shown in Table 3 1 Refer to the figure on the following page Table 3 1 TSAT PCI U P1 Connector Pinout Antenna Pin Antenna Connect
32. rator User Manual ii TPRO PCLU TSAT PCI U Spectracom Corporation 7 22 7 23 7 24 8 8 1 8 1 1 8 1 2 8 1 3 8 1 4 8 1 5 8 1 6 8 2 8 2 1 8 2 2 9 CISA TAGS _____________ 7 17 Brauerei RE EN 7 18 Asser Ded SERES OE ceto n bt 1 18 OPTIONS AND 55 5 22222 gt 555555 52555 5 555555 65555 860595 8 1 0 1 DIG Rer oS 8 1 HB1PPS Cannot Be Combined with Options FXA FXB 8 1 TSAT PCI U Only Cannot Be Combined with Options 1 5 8 1 FXB TPRO PCI U Only Cannot Be Combined with Options HBIPPS 8 1 EOM 9 2 Pda us FU ONY 9 2 ACOS ONC 9 3 GPS DUC 9 3 deer cH TEE 8 3 DRIVER SUPPORT sees enisi Rive AERE 9 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCL U 1 Overview This manual provides comprehensive information on the system architecture specifications and operation of the Spectracom TPRO PCI U and TSAT PCI U Synchronizable Time Code Generators with Universal PCI Bus Interface The TPRO PCI U is a p
33. recision clock that synchronizes automatically to standardized timecode signals or for the TSAT PCI U configuration to the GPS satellite system and can be read from the PC host computer Inputs to the TPRO PCI U are modulated timecode or for the TSAT PCI U GPS receiver signals host commands and time tags Outputs are modulated IRIG B timecode programmable start stop time and a programmable heartbeat pulse rate The board can generate interrupts on the universal PCI bus if enabled Interrupt sources include the heartbeat time tag FIFO data available and at the programmable start time The clock automatically synchronizes to specified timecode signals A status bit advises the host of synchronization status In the absence of timecode input or GPS the board starts counting at 000 days 00 hours 00 minutes 00 seconds at power on The clock time can also be set by user command 1 1 General Information about GPS NOTE GPS applies only to the TSAT PCI U board the TPRO PCI U is not equipped for GPS The United States government operates a set of approximately 32 satellites collectively known as the GPS Constellation or GPS Satellites Each satellite has an internal atomic clock and transmits a signal specifying the time and satellite position On the ground the GPS receiver determines its position longitude latitude and elevation and the time by decoding the signals simultaneously from at least four of the GPS satellite
34. red location on the rear panel then plug the board in Attach the top of the mounting bracket with the screw from the metal plate Close the computer plug in the line cord start the computer Depending on which operating system being used a message that identifies new hardware may appear this message may indicate that the hardware is of unknown type This is normal Exit the Found New Hardware dialogue box DO NOT click on Have Disk The TPRO PCI U and TSAT PCI U operate automatically as soon as the host computer system performs the power on reset To change the operating parameters or read data consult Chapter Seven Synchronizable Timecode Generator User Manual 5 1 TPRO PCHFU TSAT PCHU Corporation An on board LED LED1 flashes a status pattern to assist in diagnosing installation errors The pattern is a sequence of short and long flashes To enable the status pattern to repeat more frequently trailing short flashes are deleted Table 5 1 LED Flash Patterns Flash Position Meaning of Short Cleared Flash Meaning of Long Set Flash 1 GPS satellite receiver being used for time Modulated timecode input being used for time reference reference 2 Synchronization to better than Sus verified with Synchronization to better than 5us not verified last 5 seconds within last 5 seconds 1PPS pulse from GPS satellite receiver is OK GPS satellite receiver serial data being received OK Timecode input bei
35. s The satellite orbits are circular inclined approximately 56 degrees from the equator orbiting the Earth once every 11 hours There are several different orbital planes providing continuous coverage to all places on Earth The GPS receiver uses an omni directional antenna the satellites move slowly across the sky they are not at fixed locations Each satellite transmits a spread spectrum signal centered at 1575 42 MHz When power is first applied the GPS receiver begins searching for the satellites It does this by searching for each satellite individually listening for each satellite s distinct spread spectrum hopping sequence This process can take a few minutes as the receiver iteratively locates satellites refines its position and determines for which satellites to search The GPS receiver retains the last Known position when the power is switched off This results in faster satellite acquisition the next time it is switched on If the antenna has been moved more than a few miles however acquisition time will be slightly longer because it must first re compute the position Synchronizable Timecode Generator User Manual 1 1 TPRO PCLU TSAT PCI U Spectracom Corporation 1 2 Your Spectracom GPS Receiver Your board s GPS receiver is built into the antenna housing and communicates to the board via a serial RS 422 interface Power 12V is supplied from the board The unit comes with a 100 foot cable Extension cables are ava
36. se 10 digit Synchronizable Timecode Generator User Manual 70 TPRO PCLU TSAT PCI U Spectracom Corporation Table 7 2 Clock Time Data Most Significant Nibble Nibble Nibble Lease Significant Nibble Base 0x08 Reserved 10 Days 10 Days For example if the time is day 123 hour 11 minute 58 second 17 654321 the time is read as follows Location Contents Base 0 0 0 4321 Base 0 0 0x1765 Base 0x0a 0x1158 Base 0x08 0 0123 U Unknown 7 5 Sending Commands Writing to the Command Port at Base 0x02 sends commands to the board A small delay is required after sending each word Note that there is no way to read back a command once it has been sent Commands consist of one or more 16 bit words of which only the lower 8 bits are actually used These lower 8 bits are further divided into two 4 bit nibbles For some commands the high nibble is a constant and the low nibble contains the data For other commands both the high and low nibbles are constant It is necessary to wait at least 100 uS after sending each command word before sending anything else to the command port 4 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U Table 7 3 Command Functions Command Reset Firmware 0 0041 Enable Sync 0x004d Disable Sync 0x004e Put 10 Minutes 10 Seconds or 16 Heartbeat in Holding Register Copy Holding Register to Start Time 107 1
37. t some point all boards downstream of the break continue to have the same time driven by the first board s freewheeling clock Also it eliminates the need for BNC connectors The board synchronizes to the incoming timecode automatically An on board 10 MHz crystal oscillator is phase locked to the timecode carrier frequency This results in timing resolution down to 145 despite the fact that the input carrier is only 1 kHz or 10 kHz for IRIG A Also this precludes using timecode from sources with unstable time bases e g playback from tape or digital storage By definition the timecode format standard IRIG B NASA36 or IRIG A specifies that the format for transmitting the date be an integer 001 366 This is referred to as the Julian date Note that the date is not in year month day as in Gregorian format NOTE Although the user s software can convert from a Julian date to a Gregorian date be careful First the user s software must distinguish whether or not the current year is a leap year Second the user s software must account for the fact that when freewheeling before synchronizing the board will report an invalid Julian date 000 6 2 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U Programming 7 1 General Information From a programming standpoint the board appears to be a PCI to ISA bridge device This means that the universal PCI bus sees the board as a device
38. the Assert Reset command disables all interrupts CAUTION The FIFO Ready interrupt occurs each time the FIFO changes from being empty to containing data the users software detects quickly that the first word has been written into the FIFO and reads it out it is possible that the FIFO will be empty for a moment Thus when the second word is put into the FIFO it generates another interrupt The solution is to disable the FIFO Ready interrupt until all 10 words have been read from the FIFO then re enable the interrupt 242 Synchronizable Timecode Generator User Manual TPRO PCIU TSA T PCI U Spectracom Corporation 7 16 Setting the Propagation Delay Correction This command is used to correct for delays that are due to cable length timecode or GPS cables Most applications do not need to compensate for cable delays because the delay is on the order of a hundred nanoseconds while the clock s resolution is 1 microsecond However introducing a deliberate large offset can be helpful in situations in which the board is used to trigger an instrument slightly before a particular time The range of the propagation correction is 1000 uS to 8999 uS The power on default is zero To specify the propagation delay first clear the Holding Register then write four words representing each of the digits in the delay value then send the Set Clock Time Propagation Time command A special number sequence is used
39. the board i e that the PCI bus addressing is working correctly Sending the De assert Reset command without first sending an Assert Reset command will also reset the board 7 18 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U 8 Options and Accessories 8 1 Options 8 1 1 DCLOBNC This option provides a DC shift level output on the J2 BNC connector and P1 D type connector Pin 9 The BNC or the 15 pin D type connector provides a DC shift level output with the rising edge on time The modulated IRIG B output is eliminated with this option 8 1 2 HB1PPS Cannot Be Combined with Options FXA FXB HDRV This option provides a 1PPS on the heartbeat output at power up The heartbeat output P1 Pin 6 can be programmed as either a pulse or a square wave The specified rate must be an exact multiple of 1 000 mS The range of programmable rates is Minimum Rate lowest frequency esee 65 534 Seconds 0 0152593 Hz Maximum Rate highest 2 mS 500 Hz Pulse Width time low pulse mode only esses 1 mS typical Programming iio np dis pte I ees aste Ie 1 mS The default rate at power up is 1Hz pulse mode 8 1 3 FXA TSAT PCI U Only Cannot Be Combined with Options HB1PPS HDRV This option provides an RS 422 driver for the Heartbeat Output and provides the same rang
40. the final command is 0x00e3 instead of 0 00 2 The sequence must be completed at least 50 mS before the commanded time occurs The match output and interrupt if enabled operates regardless of whether the board is in sync or freewheeling Synchronizable Timecode Generator User Manual 7 13 TPRO PCLU TSAT PCI U Spectracom Corporation 7 18 Programming the Heartbeat Output Not Applicable to 5 FXB LORI Options The heartbeat output P1 Pin 6 be programmed to be either a pulse or a square wave specified rate must be an exact multiple of 1 000 uS The range of programmable rates is Minimum Rate lowest 21 845 mS 45 7771 Hz Maximum Rate highest 1 000 45 1 000 MHz Pulse Width time low pulse mode only 150 nS min 450 nS max negative polarity To specify the rate or frequency compute the divide number N as follows Note that N must be exactly divisible by 3 meaning that the specified period must be an exact multiple of 1 000 us To specify a period for a pulse or square wave compute N as 31 107 t is the period in seconds To specify a frequency for a pulse or square wave compute N as N 3 10 F is the frequency in Hertz Not all values of N are acceptable Verify that the computed value is evenly divisible by 3 and that it is in the range of 3 to 65 535 inclusive Convert N into hexadecimal Base 16
41. the receiver has been operating for a few minutes and has calculated the position longitude latitude and altitude it saves the position in memory A saved position results in faster re acquisition the next time power is applied A large capacitor on the board provides voltage to the receivers memory if the cable between the board and the receiver is disconnected or if the computer has not been turned on in approximately the past 10 days the receiver s position memory is lost Therefore a slightly longer acquisition time is required the next time that power is applied The time obtained is in Coordinated Universal Time UTC format This means the same time and date is received in all parts of the world regardless of local time zone UTC is 5 hours ahead of Eastern Standard Time EST in the United States in winter and 4 hours ahead of Eastern Daylight Time EDT in summer UTC is not adjusted for Daylight Saving time for example 10 00 p m in New York City on July 3rd is 02 00 a m July 4th UTC A Gregorian date consists of the year month and day in the format YYYY MM DD for example 2003 09 19 for September 19 2003 The Gregorian date can be read from the board however the Gregorian date is not transmitted in the IRIG B output Instead the IRIG B output transmits the Julian date an integer from 001 366 that represents the day number in the year This limitation is due to the standard definition of the IRIG B code format Synchr
42. tions not performed by Spectracom The GPS receiver is warranted for one year from date of shipment and subject to the exceptions listed above The power adaptor if supplied is warranted for one year from date of shipment and subject to the exceptions listed above THE ANALOG CLOCKS ARE WARRANTED FOR ONE YEAR FROM DATE OF SHIPMENT AND SUBJECT TO THE EXCEPTIONS LISTED ABOVE THE TIMECODE READER GENERATORS ARE WARRANTED FOR ONE YEAR FROM DATE OF SHIPMENT AND SUBJECT TO THE EXCEPTIONS LISTED ABOVE The Rubidium oscillator if supplied is warranted for two years from date of shipment and subject to the exceptions listed above All other items and pieces of equipment not specified above including the antenna unit antenna surge suppressor and antenna pre amplifier are warranted for 5 years subject to the exceptions lisied above WARRANTY CLAIMS Spectracom s obligation under this warranty is limited to in factory service and repair at Spectracom s option of the product or the component thereof which is found to be defective If in Spectracom s judgment the defective condition in Spectracom product is for a cause listed above for which Spectracom is not responsible Spectracom will make the repairs or replacement of components and charge its then current price which buyer agrees lo pay Spectracom shall not have any warranty obligations if the procedure for warranty claims is not followed Users must notity Spectracom of the
43. to specify negative delays To specify delays from 1000 uS to 1 uS send values of 9000 to 9999 respectively For example to specify a correction of 4567 uS send the following sequence of commands to the command port Clear the Holding Register 0x0034 0x0025 0 0016 0 0007 Specifies 4567 0x00e0 Set propagation correction 7 17 Setting the Start Stop Match Times Not Applicable to Options FXA FXB or HDRV The match output P1 Pin 8 goes high at the Start time and low at the Stop time The match interrupt occurs at the Start time not at the Stop time The match flag in the Status Register goes true at the Start time and remains true until the user clears it with a software command To specify the Start and Stop times first clear the Holding Register then command the days through seconds portion of the time send a set command next send the milliseconds through microseconds finally send another set command For example to command a Start time of day 123 hour 11 minute 58 second 17 456789 send the following sequence to the command port Clear Holding Register 0x0051 0x0062 0x0073 Day 123 0 0081 0x0091 s Hour d 0x00a5 Minute 58 0 00 1 0x00d7 Second 17 0x00e1 Send days seconds 0 0084 0 0095 0x00a6 XX 456xxx seconds 0x00b7 0x00c8 0 00 9 789 seconds 0x00e2 send Start time To specify the Stop time the sequence is the same but
44. ts of the command identify which digit is being loaded the lower 4 bits contain the actual data to load Once all the digits have been loaded a command is sent to arm the clock For example to set the clock to day 123 hour 11 minute 58 second 17 send the following sequence of commands to the Command Port Clear the Holding Register 0 0051 0 0062 0x0073 Day 123 0 0081 0 0091 Hour 11 0 00 5 Ox00b8 Minute 58 0 00 1 0x00d7 Second 17 0 004 Arm the clock for next 1PPS After sending the 0 004 command the board sets the milliseconds and microseconds to 000000 when the first 1PPS occurs the seconds do not increment Then on the second 1PPS pulse the time seconds begins to increment CAUTION The board expects the 1PPS input to be continuous If the 1PPS signal stops pulsing after the board establishes initial sync the board will continue to increment time freewheel However if the 1PPS signal resumes after a period of freewheeling the board may reset the clock time to 000 00 00 00 000000 This is because the 1PPS occurs outside of a narrow window in which the board expects it either because the 1PPS has moved or because the time has drifted during freewheeling The arm command 0 004 must be sent no sooner than 50 mS after the previous 1PPS occurred and no later than 50 mS before the next arming 1PPS occurs Synchronizable Timecode Generator User Manual
45. tude of the timecode input is adequate for detection It does not indicate whether the input is valid For TSAT PCI U this bit will always be zero Synchronizable Timecode Generator User Manual 11 TPRO PCLU TSAT PCI U Spectracom Corporation Bits 5 6 and 7 provide a means for reading back the corresponding bits in the Interrupt Control Port Bits 3 and 4 may be true 1 when power is first applied The user s software must clear bits 3 and 4 before using them 7 15 Interrupt Control Port The board can generate interrupts when the FIFO has data when each heartbeat occurs and or when the commanded Start Time occurs Each of these is enabled separately via the Interrupt Control Port and any all or none can be enabled simultaneously The Interrupt Control Port is a single 16 bit word of which only 3 bits are actually used It is located at Base 0x00 and is write only The bits in the Interrupt Control Port are defined as shown in Table 7 5 Table 7 5 Interrupt Control Port Bit Definitions mb Name Action O 5 Match Mask Siart ime causes The board generates the same interrupt regardless of whether it was caused by heartbeat start time or FIFO data available After an interrupt the user s software must interrogate the board to determine which of these was the cause The power on default is to have all interrupts disabled Also sending
46. umber of GPS Satellites Being Tracked TSAT PCI U Only The GPS receiver determines automatically which satellites to track The number quantity of satellites being tracked is reported in the FIFO in response to sending command 0 005 to the command port The response is of the form shown here wes NOTE The number of satellites tracked is for diagnostic purposes only number of satellites ranges from O to 8 inclusive Valid time and position require that at least four satellites be tracked The In Sync flag in the Status Register must be used to actually determine whether the board is synchronized and providing valid position 240 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO PCLU TSAT PCI U There is no difference in timing accuracy when 5 6 7 or 8 satellites are being tracked It is normal for the number to fluctuate between 5 and 8 given that the GPS receiver picks different satellites to optimize the timing It is normal for the number of satellites to be between 0 and 3 during acquisition and re acquisition 7 13 Enable Disable Sync The board can be forced to freewheel by sending the Disable Sync command Sending this command causes the board to ignore the timecode input the 1PPS input Option M only and the GPS input TSAT PCI U only To restore normal operation send the Enable Sync
47. ver must track at least four satellites simultaneously in order to determine time and position Best accuracy is achieved when the satellites that are being tracked are scattered widely across the sky the receiver automatically attempts to choose satellites based on maximum apparent separation Therefore it is important that the antenna have a clear view of as much sky as possible and for the same reason be mounted with the connector pointed down The satellites do not remain at a fixed location in the sky Occasionally the receiver stops tracking a satellite and begins searching for another one this causes fluctuations in the number of satellites tracked between five and eight The most common complaint among new GPS users is that the time needed to begin tracking satellites varies each time the unit is turned on or that it seems to take a long time to begin tracking Refer to the section entitled Specifications in Chapter Two for typical and maximum times and note that significant variations around the typical time are normal If the receiver has not established synchronization after the maximum time specified the most probable reason is that the antenna does not have an unobstructed view of the sky try re locating the antenna Note that the GPS receiver is built into the antenna housing additional filtering cannot be installed When power is applied the GPS receiver automatically begins to search for GPS satellite signals After
48. website at www spectracomcorp com to download datasheets and manuals Synchronizable Timecode Generator User Manual 9 1 TPRO PCIU TSA T PCI U 22 Corporation Synchronizable Timecode Generator User Manual REVISION HISTORY Revision ECN Level Number First conversion of legacy KSI documentation level 3 0 Added information regarding pinout for external 1PPS signal for option M in section 8 1 6 Clarified language throughout manual referencing universal PCI bus interface Added pinout figure Removed inapplicable options Spectracom Corporation 25 Methodist Hill Drive Rochester NY 14623 www spectracomcorp com Phone US 1 585 321 5800 Fax US 1 585 321 5219

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