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Abstract

The present invention provides a method of computing the cost of a proposed clock tree change in the context of a clock skew optimization routine. According to the present invention, a recalculation of the clock skew cost due to a proposed change in the clock tree can be done without having to recompute the effect of the change to all of the sinks of that clock tree. The method stores the effects of past delay changes as unpropagated incremental changes until future changes make it necessary to propagate those changes. Thus, in this method only the parameters of the ancestors of the delayed node need to be recalculated to determine the cost of a proposed change in the clock tree. Not having to recalculate the rest of the tree greatly reduces the computational complexity and time required for the process, allowing the required iterations to be completed in a much shorter time period.

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First Claim