METHOD OF EVALUATING BEARISH ERROR OF STATISTICAL TIMING ANALYSIS

摘要

PPROBLEM TO BE SOLVED: To provide a method which is capable of obtaining an upper limit of errors in a bearish direction in LSI yield prediction calculation results of statistical timing analysis or specifying a range of a LSI yield predictive value (actual LSI yield) in the case of the absence of calculation error. PSOLUTION: First, a yield is calculated by normal SSTA. Next, an independent LL set which is a subset having sets of delay element sets which include only gate and network not being shared by two or more paths is determined. Next, a yield is calculated by SSTA while using only the independent LL set. Thereby, it is clarified that the actual yield is between the yield obtained by normal SSTA and the yield obtained by SSTA using only the independent LL set. PCOPYRIGHT: (C)2008,JPO&INPIT