Timing Classification of Digital Systems

plesiosynchronous

This is a small piece of info I came across and thought may be useful for others. It can also be a possible interview question.

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Signals in digital systems are classified into Synchronous,Mesosynchronous and Plesiosynchronous.

Synchronous

A synchronous signal is one that has exactly the same frequency as the local clock and maintains a fixed phase offset to that clock. In such a scenario, the signal is synchronized with the clock, and the data can be sampled directly without any uncertainity.

Mesosynchronous

A mesosynchronous signal is a signal that not only has the same frequency as the local clock, but also has an unknown phase offset with respect to that clock.

Plesiosynchronous

A plesiosynchronous signal has a frequency that is nominally the same as that of the local clock, yet is slightly different. This causes the phase difference to drift in time.

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Suggestions, additions and comments are most welcome.

mesosynchronous

I don't know whether the above is right.
But you cover the signal in digital. There must contain the asynchronous signals.

mesosynchronous clock

yes
i have seen this classification in barkey course ee241
advanced digital integrated circuits