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SPARTAN-3 FPGA board DCM question

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rg_ming

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Hi,

If I run two counters at two FPGA boards(each board has one counter) to count time, the counters' clocks are generated by FPGA DCM module.

Assume the frequencies(MHz order) of the two counters are the same, and one counter starts at time t1, another start at time t2, then the time difference of the two counters is |t2-t1|.

My question is if I run the two counters for a long time, will the time difference stay the same? If not, how much is it expected to change?

Thanks in advance.
 

there will be jitter. this is a short term difference in frequency. most likely, it will only change by +-1 cycles, though more is possible when you multiply the clock by a large amount.

Of course both boards must have the same reference clock.
 

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