Symmetricom's bc635PCI Time and Frequency ProcessorPCI local bus operation with GPS or time-code inputs

Symmetricom bc635PCI
pci	x86	v. 4.0
Market:	military and aerospace

Symmetricom's bc635PCI and bc637PCI receiver modules provide precision time and frequency reference to the host computer and peripheral data acquisition systems. Time is acquired from either the GPS satellites using a supplied antenna/receiver (bc637PCI only) or from time code signals, typically IRIG B.

• PCI local bus operation
• GPS or time-code inputs
• Time-code outputs
• Pulse-rate outputs
• Frequency outputs (1, 5, or 10 MHz)
• External event capture register/interrupt
• Programmable periodic output/interrupt
• Programmable time strobe output/interrupt
• Battery-backed clock
• IEEE 1344-compliant IRIG B time code

Central to the operation of the module is a disciplined 10 MHz oscillator and 100 nanosecond clock. Current time (days to 100 nanoseconds) can be accessed across the PCI bus with zero latency, which allows for very high speed time requests. The on-board oscillator is rate-matched (disciplined) to the input time source and drives the precision 10 MHz frequency output and time code generator circuitry. If time is lost, the module will continue to maintain time (flywheel). If power is lost, a 10 PPM battery backed clock is available to maintain time.

Both time code generation and translation are supported. The generator supplies IRIG B time code output that is synchronized to the input time source. The translator reads IRIG A, IRIG B, and NASA 36.

An event time capture feature provides a means of latching time for an event input. The module can also be programmed to generate a periodic pulse rate as well as to generate a single time strobe at a predetermined time.