Model TPRO-VME - Multi-function Timecode Reader/Generator
The TPRO-VME performs timing and synchronization functions referenced to an input timecode signal.
The board synchronizes its on-board clock to the incoming timecode. The clock is also provided as an IRIG-B output. Other features include a time-tag TTL input, a 1MHz TTL output, and two user-configurable TTL pulse rate outputs. The board continues to increment time (“freewheel”) in the absence of an input timecode. Thus, the host computer can set the on-board clock over the bus, and the board can be used as an IRIG-B generator. The input timecode format is detected automatically.
Synchronization to the input timecode is also automatic, and a propagation delay offset can be specified to compensate for cable delays. Front panel indicators include presence of input timecode and successful synchronization. An option seven segment LED display shows day and time in DDD:HH:MM:SS format. The timecode input is an amplitude modulated sine wave. The peak amplitude can be between 0.5Vp-p and 8.0Vp-p. The timecode input is differential; the board does not reference this signal to ground. A single-ended input (referenced to ground).
VME Interface
The board supports A32, A24, and A16 addressing modes using the standard address modifiers. Other address modifiers can be supported by custom modifications. All board functions can be generated when time is available or when a time-tag event has occurred.
The interrupt level (IRQ1–IRQ7) is selected by jumpers, or the user can disable interrupts and poll the status register instead. Customized periodic interrupts are also available. The VMEbus specification permits Rows A and C of the P2 backplane connector to be user-defined. The on-board clock time is output as 54 TTL signals on these pins; this provides continuous time with zero latency.
To prevent any possible conflict with other user-specific boards in the system, order the board with Option –32P2 to eliminate these outputs.
Features
- IRIG-A, IRIG-B, NASA36, XR3 and 2137 timecode reader
- Multifunctional timecode reader/generator
- Time-Tag input
- Two configurable pulse rate outputs
- A32, A24, or A16 configurable base address
- D08 (O) or D32 data words
- Continuous parallel time output is also acceptable.
Downloads
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TPRO- VME - datasheet, including full product specifications (65kb PDF)
TPRO- VME - Manual (647kb PDF)