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On the equivalence of fanout-point faults

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1 Author(s)
Lioy, Antonio ; Dipartimento Automatica e Inf., Politecnico di Torino, Italy

Test-equivalent faults are commonly used in test generation and fault simulation to reduce the number of explicitly addressed faults. At the gate level, practical equivalence rules are confined to faults on the input and output terminals of Boolean gates and those related to fanout-free wires. It is shown that under some conditions equivalence may also be stated between faults on a fanout stem and its branches. A modification of the standard fault folding algorithm is proposed, which leads to reducing the number of target faults and occasionally identifying logic redundancies. Application to real designs shows that the added computational complexity is negligible, while for some classes of CMOS circuits hard-to-simulate faults are eliminated and hence their fault simulation time is drastically reduced

Published in:

Computers, IEEE Transactions on  (Volume:42 ,  Issue: 3 )

Date of Publication:

Mar 1993

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