Abstract
The results of an extensive study of five existing testability measures when used to aid heuristics for automatic test pattern generation algorithms are presented. Each measure was evaluated using over 60000 faults in circuits of varying size and complexity. The performance of these measures was rated using several different criteria. Based on these results the performance of a composite test generation strategy that uses multiple guidance heuristics was evaluated. The results indicate that this strategy not only provides better fault coverage but also reduces the average time taken to generate a test or determine that a given fault is undetectable. >
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