Fault coverage We consider a NOR gate with 3 inputs,

a, b and c and one output d.

Analyze this gate's functioning when affected by single stuck-at 0/1 faults of the

a, b, c and d signals.

1. Find the test sequence having the shortest length (this sequence will be called optimal test sequence).

2. Trace the coverage curves of i) the exhaustive test sequence, ii) the optimal test sequence, iii) a toggle test sequence.