For f = AB+CD if B is S-a-1, what r the test vectors needed
to detect the fault?
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Answer Posted / yashwanth.jada
1)Analysis: S-a-1 in B
2)Simulate the fault location (B): Give 0 (compliment of S-a-F) as input at B, this way one can distinguish True value/Faulty value.
3)Propagate the faulty value to primary output (f): A has to be a non controlling value i.e 1 in order to propagate the fault (0/1 at B) to AB AND gate. In order to see the fault effect at output f, the other input of OR gate has to be a non-controlling value i.e 0.
4)Justification for 0 at OR gate input: Atleast one of the inputs between C and D has to be 0.
5)Final test vector for B S-a-1: 100X or 10X0 {(1000),(1001),(1010)}
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