Explain term meta-stability

Explain the term meta-stability? When and why it may occur? Explain several ways in order to avoid this?

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Meta-stable state : It is an un-known state in between two logical known states. This may happen in case the O/P cap is not permitted in order to charge/discharge completely to the needed logical levels.

One of cases is: In case, there is a setup time violation, meta-stability may happen, in order to prevent this, a series of FFs is employed that will eliminate the intermediate states.

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