TPRO-PC104 Timecode Reader-Generator0 pages

Timecode Reader/Generator
Model TPRO-PC104

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IRIG-A, IRIG-B, NASA36 timecode reader

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IRIG-B timecode generator

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IRIG-B output

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Time-Tag input

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Freewheel capability

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Programmable start/stop time output and
interrupt capability

The TPRO-PC104 performs timing and synchronization functions referenced to an input
timecode signal, synchronizing its on-board clock to this timecode and providing its clock
time as an IRIG-B output. Other features include a time-tag TTL input, programmable
“heartbeat” pulse or squarewave output (with interrupt capability), and programmable
“match” start/stop time output (with interrupt capability).
The board continues to increment time (“freewheel”) in the absence of an input timecode.
It can serve as an IRIG-B timecode generator after inital time is set via the bus.
The input timecode format (IRIG-B, IRIG-A or NASA36) is automatically detected.
Synchronization to the input timecode is also automatic and can be enabled/disabled via
the ISA bus. A propagation delay offset may be specied to compensate for cable delays.
An automatic gain control (AGC) circuit permits a wide range of input timecode amplitudes.
The timecode input is differential; the board does not reference this signal to ground. A
single-ended input (referenced to ground) is also acceptable. One-pulse-per-second (1
PPS) input synchronization is also available (Option “–M”). In this case, the initial time
is programmed via the ISA bus and the board begins counting on the next 1 PPS pulse.

PC104 Interface

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UK | 6A Beechwood | Chineham Park | Basingstoke, Hants, RG24 8WA | +44 (0)1256 303630 | info@spectracom.co.uk

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

. . . quality

The board occupies 16 consecutive addresses in I/O (not memory) space. Base address
and interrupt level are selected using jumpers. All board functions can be used without
interrupts and can be accessed using 8-bit transfers. The time can also be read using four
16-bit transfers. Binary-coded decimal (BCD) format is used for setting and reading the time.