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Setup time is the minimum amount of time the data signal should be held steady before the clock event so that the data are reliably sampled by the clock.
Or
the minimum time before which data must be stable before clock transition.

Hold time is the minimum amount of time the data signal should be held steady after the clock event so that the data are reliably sampled.
Or
the minimum time after which data must be stable after clock transition.

These are the times during which the data input must be stable.

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12y ago

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