FA-89067 / Digital logic simulation / Member archive

Unknown to floating counted as a rising edge · case 02

An x->z or z->x transition triggers posedge event controls.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input [seq]: a string of samples over '0','1','x','z'. Levels order 0 < {x,z} < 1 (x and z are the same middle level). A change to a higher level is a posedge (0->1, 0->x, 0->z, x->1, z->1), to a lower level a negedge; x<->z is no edge. The first sample has no predecessor. Return [posedge indices, negedge indices].

Why this case matters

Event controls on clocks and resets fire on unknown transitions; an edge classifier that only knows 0->1 misses or invents triggers.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
unknown to floating is no edge	`[[2, 3, 4], [5]]`	`[[4], [5]]`	Failed

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