Timing Methodologies (cont’d)

there is a timing "window" around the clocking event during which the input must remain stable and unchanged in order to be recognized

clock

data

changing

stable

• Definition of terms

  • setup time: minimum time before the clocking event by which the input must be stable (Tsu)
  • hold time: minimum time after the clocking event until which the input must remain stable (Th)

clock

data

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