WARNING: 100% Fault Coverage May Be Misleading!!
M. Abramovici, Prashant S. Parikh · 2005
In this gaper we show that even when a sequential test generator does a perfect job and achieves 100% detectable fault coverage, a circuit passing the test may still exhibit severe testability problems caused by undetectable faults that prevent initialization (FPIs). Thus 100% fault coverage may be a misleading quality indicator, unless undetectable FPIs are accounted for. We present the first algorithm able to identify undetectable FPIs and we report the results obtained for the sequential benchmark circuits. We also discuss the design for testability techniques that make these faults detectable.