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Clock-skew calculation
- tffpd(min) + tcomb(min) thold tskew(max) > 0
- First two terms are minimum time after clock edge for a D input to change
- Hold time is earliest time that the input may change
- Clock skew subtracts from the available
hold-time margin
- Compensating for clock skew:
- Longer flip-flop propagation delay
- Explicit combinational delays
- Shorter (even negative) flip-flop hold times
Notes: