PRODUCTION OF FAULTY DICTIONARY

摘要

PURPOSE:To improve the decomposition factor with production of a trouble dictionary by calculating the trouble transmission sensitivity of the input pin of each element in a computer circuit and discontinuing the backward tracing to the signal line having its trouble transmission sensitivity set at 0. CONSTITUTION:The signal name with which the value of a signal line is fixed at 0 or 1 in a normal working mode of a device and the logical value of said signal name are given as the fixed value signal information 10. A logical simulation part 100 sets a fixed value signal line at the designated logical value with other signal lines set at unfixed values respectively for execution of simulation. A trouble transmission sensitivity calculation part 200 calculates the trouble transmission sensitivity of the input pin of each element. A cover area extraction processing part 300 starts the backward tracing through a trouble detecting circuit and extracts the noticed source element. This tracing is discontinued if the trouble transmission sensitivity is equal to 0. When all tracing actions are through, the exchange units extracted in the tracing mode are registered to a faulty dictionary 30.