Patent ID: 7793244

Claim:
A signal timing analysis method for analyzing timing of a signal propagated along a path including a plurality of instances, the method comprising: performing, via a computer system, a delay calculation; generating a file storing delay information and a file storing an input slew rate and an output capacitance as a calculation result of the delay calculation; performing static timing analysis based on the delay information and generating an analysis result; calculating a delay distribution for each instance based on the input slew rate and the output capacitance stored in the file, a probability distribution of a delay time for each instance, a probability distribution of a transition time of an output signal for each instance, and a correlation between the delay time and the transition time of the output signal, wherein the calculating a delay distribution for an instance includes inputting a distribution of an input slew rate for a preceding-stage instance taking into consideration a correlation between an output delay distribution and an output transition distribution for the preceding-stage instance; and performing statistical timing analysis on the signal propagated along the path based on the analysis result of the static timing analysis and the delay distribution.