Logic and Fault Simulation151Distributed fault simulation divides the entire fault simulation into smaller tasks,each of which is performed independently on a separate processor.3.4.8Alternatives to Fault SimulationBecause fault simulation is very time consuming and difficult for large circuits,alternatives to avoid “true” fault simulation have been developed. These alternativesrequire only one fault-free simulation or very few fault simulations, so the run timeis significantly reduced. The alternatives give approximate fault coverage numbers.It should be noted that these alternatives are probably acceptable if the purposeof fault simulation is to estimate the quality of test patterns (i e, fault grading).These alternatives are probably not acceptable when it comes to diagnosis. This isbecause diagnosis requires exact information about which patterns detect whichfaults. (Please see Chapter 7 for more detailed information about diagnostic faultsimulation.)220.127.116.11Toggle Coverage
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