GPS Timing Board with PC104 Interface
- GPS-synchronized timecode generator
- GPS, IRIG-A, IRIG-B, NASA36 timecode reader
- IRIG-B timecode generator
- Time-Tag Input
- Programmable periodic output (pulse/squarewave) and interrupt
- Programmable start/stop time output and interrupt
Product Overview
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 the base address and the interrupt level. All board functions can be used without interrupts, if desired.
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.
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