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"Synchronous circuits" doesn't mean anything without additional information. Synchronous serial IO, for instance, means data is sent at a regular rate. If there's not anything to send, then dummy data is sent. Synchronous logic (such as flip-flops) means that the transfer of things from here to there is accomplished with a synchronizing clock, rather than by the levels or edges of the data, itself. A synchronous motor is one that turns, without slippage, at the frequency (or a multiple thereof) of the power source (so long as the load is within ratings). As you can see, there's no solid question here to answer.
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