FA-88994 / Digital logic simulation / Member archive

Stuck-at faults on primary inputs never injected · case 04

Faults on primary inputs are reported as undetected by every vector.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Input [pis, gates, pos, vectors, faults]. Gates [out, op, ins] are topologically ordered (and/or/nand/nor/not). A fault [net, None, v] is a stem stuck-at on a primary input or gate output; [net, reader, v] is a branch fault that forces only the pin of gate 'reader' that reads 'net'. A fault is detected by a vector when any primary output differs from the fault-free circuit. Return [net, reader, v, first detecting vector index or None] per fault.

Why this case matters

Fault simulators grade test sets; stem/branch distinction and output comparison determine reported coverage.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
primary input stuck-at-1	`[["a", null, 1, null]]`	`[["a", null, 1, 6]]`	Failed

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