CTM-5102 IRIG Time Code Generator

• Amplitude modulated IRIG -A, -B or -G input
• Synchronized IRIG -A, -B or -G output
• Internal 10MHz fine time resolution
• Timing outputs to other PCI modules
• PCI bus initiator or target operation
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CALCULEX produces a number of different PCI bus circuit boards that provide a variety of input and output capabilities. The CTM-5102 module is an IRIG time code reader/translator and synchronized generator.

The CTM-5102 has an internal 10MHz clock that is used to maintain a 100 nanosecond fine time counter. When presented with an external amplitude-modulated IRIG -A, -B or -G time code signal, the internal 10MHz clock is phase-locked to the external time code carrier. Upon loss of the external time code signal, the internal clock will flywheel until the external signal is reacquired. The synchronized generator can produce an amplitude modulated IRIG -A, -B or -G output from the internal 10MHz clock. Under software control, the generator's output may be scaled by powers and factors of two for time base compression and expansion operations. The CTM-5102 also provides timing references to all other PCI boards in the system to synchronize the fine time stamps generated independently on each module.

The PCI bus interface on the CTM-5102 supports both initiator and target transfers. For initiator transfers, the module arbitrates for use of the PCI bus and when granted, performs single cycle or burst transfers as directed to the designated target addresses. For target transfers, the buffers on the CTM-5102 are mapped into the PCI bus address space and an external bus initiator performs either single cycle or burst accesses with the module.