TPRO-cPCI Timecode Reader-Generator0 pages

Timecode Reader/Generator
Model TPRO-cPCI

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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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Freewheel capability

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Programmable periodic output (pulse/
squarewave) and interrupt capability

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Programmable start/stop time output and
interrupt capability

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High-performance, 2.5 ppm oscillator

The TPRO-cPCI provides high-accuracy timing functions on a plug-in board for the Compact
PCI computer bus. The board has an on-board clock, which is kept in sync to an external
timecode input. Several timing functions are derived from the on-board clock, including
a programmable periodic pulse rate output (“heartbeat”), a programmable start/stop
output (“match”), a selectable frequency output (“oscillator out,” 1 kHz, 1, 5, or 10 MHz),
and a time-stamping input (“time-tag”).
The TPRO-cPCI obtains time from an input timecode, which can be formatted as IRIG-A,
IRIG-B, or NASA36. The board automatically detects which format is being used. An
AGC circuit on the time code input accommodates a wide range of input amplitudes. The
timecode conveys the day, hour, minute, and second. The on-board 10 MHz oscillator is
disciplined to the time code input carrier frequency. The board’s IRIG-B timecode output is
in-sync with the incoming timecode.
The TPRO-cPCI can be used as a stand-alone timecode generator. The computer programs
the day, hour, minute, and second. The board then continues to count from that time, using
the on-board oscillator as the timebase reference. This is called “freewheeling.”
The host computer communicates to the board through a set of memory-mapped
registers. When the computer boots up, the board identies itself to the Compact PCI
bus by specifying the unique Subsystem Vendor ID. The host computer can then read the
instantaneous time and command the board to set time, and/or to provide an interrupt at
a periodic rate, at a specied time, and/or when a time-tag event occurs.

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