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Timing

Combination Circuit​

  • contamination delay (t_cd): minimum path in circuits, outputs start to change
  • propagation delay (t_pd): maximum path in circuits, outputs complete change
  • (delay) heavy dependence on voltage and temperature

Sequential Circuit​

minimize clock skew time: requires intelligent clock network across a chip, making clock arrives at all locations at roughly the same time.

T_clock >= T_pcq + T_pd + (T_setup + T_skew)
T_ccq + T_cd > (T_hold + T_skew)