205_pdfsam_VLSI TEST PRINCIPLES & ARCHITECTURES

205_pdfsam_VLSI TEST PRINCIPLES & ARCHITECTURES -...

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174 VLSI Test Principles and Architectures Algorithm 3 JustifyFanoutFree C g v 1: g = v ; 2: if gate type of g == primary input then 3: return; 4: else if gate type of g == AND gate then 5: if v == 1 then 6: for all inputs h of g do 7: JustifyFanoutFree C h 1 ; 8: end for 9: else v == 0 10: h = pick one input of g whose value == X ; 11: JustifyFanoutFree C h 0 ; 12: end if 13: else if gate type of g == OR gate then 14: 15: end if call #1: JustifyFanoutFree C g 1 call #2: JustifyFanoutFree C a 1 call #3: JustifyFanoutFree C f 1 call #5: JustifyFanoutFree C c 0 After these calls to JustifyFanoutFree(), abcd = 1 X 0 X is an input vector that can justify g = 1. Consider another circuit C shown in Figure 4.10. Note that the circuit is not
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