Delays can be negative in some unusual situations. For example, if the input transition is
slow and the output transition is fast for a cell, the time at which the input signal reaches the
50% trip point can be later than the time at which the output signal reaches the 50% trip
point. The resulting delay from input to output is negative. A similar situation can occur for a
net because of a change in delay caused by crosstalk. In addition, the library hold time
requirement for a sequential cell can be negative.
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发表于 2019-8-8 11:19:43
