Most likely this would be the follow-up questions after CDC questions (Fast-to-Slow, Slow-to-Fast). However, the classic double flip-flop sync mechanism mentioned before is not appropriate to be used here.

Since each line of the bus could come through different data paths, signals from different lines might reach at different time. Thus, It’s necessary to have a synchronized control signal which indicate to the other clock domain that the whole bus is ready and steady. This control signal shall be synced with the double flip-flop as mentioned before.

  • WE En: Write Enable
  • Data: 32 bits as an example
  • TX Clock: Transmitting Clock
  • RX Clock: Receiver Clock

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