TSAT-PC104 GPS Timing Board0 pages

GPS Timing Board
Model TSAT-PC104

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GPS-synchronized timecode generator

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GPS, IRIG-A, IRIG-B, NASA36 timecode
reader

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IRIG-B timecode generator

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Time-Tag input

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Programmable periodic output (pulse/
squarewave) and interrupt

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Programmable start/stop time output and
interrupt

The TSAT-PC104 is a complete system package that includes the GPS receiver/antenna
(housed in a common enclosure), a 100-foot antenna cable, and a circuit card assembly
for the PC104 bus.
The board synchronizes its on-board clock to Coordinated Universal Time (UTC). Other
features include a time-tag TTL input, a programmable “heartbeat” pulse or squarewave
output (with interrupt capability), and a programmable “match” start/stop time output (with
interrupt capability).
In the unlikely event that reception of the satellite signals is lost, the board continues to
increment time (“freewheel”). When the signals are re-established, the board resumes
synchronization automatically.
The GPS satellites provide Coordinated Universal Time (UTC) accurate to within one
microsecond. They also provide position (longitude, latitude, and elevation).
A programmable time offset allows for compensation for cable delays.

PC104 Interface
The board occupies 16 consecutive addresses in I/O (not memory) space. Jumpers on the
board allow for selection of base address and the interrupt level. All board functions can be
used without interrupts, if desired.

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USA | 1565 Jefferson Road, Suite 460 | Rochester, NY 14623 | +1.585.321.5800 | sales@spectracomcorp.com

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TSAT-PC104 functions can be accessed using 8-bit transfers. In addition, the time can be
read with four 16-bit transfers. Binary-coded decimal (BCD) format is used for setting and
reading the time.