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Minor correction:
Data bits are sometimes received twice when sent from Board 1 to Board 2, and are skipped some times on the reverse path.
Please ask if I missed any related detail. Thanks !
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Hi,
Maybe your problem has been solved. If so, ignore this. From the description above it sounds very much like you are trying to send data from one system to another with nominally the same clock frequency, but physically different oscillators. One oscillator is slightly faster than the other, which means that in one direction you occasionally duplicate a bit (if sent from the slower clok to the faster clock) and in the other direction you occasionally loose a bit (if sent from the faster clock to the slower clock). If your whole system runs from one physical clock source, then this should not not happen and the problem has to lie elsewhere.
If your intention is to have the two systems run from completely asynchronous clocks, then the safest way to cross the clock domains is with a dual clock FIFO. The simple two FF synchroniser is good for passing a single control signal, but when passing multiple signals (like data bytes), the FIFO is the safest.
Regards,
Niki
Honored Contributor
