FA-88998 / Digital logic simulation / Member archive

Fanout branch fault applied to every reader of the stem · case 03

A branch fault is detected by vectors that only propagate through other fanout branches.

Member previewVariant 3 · 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
fanout branch fault into n2	`[["n1", "n2", 0, 0]]`	`[["n1", "n2", 0, 1]]`	Failed

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