This scenario is about a bug that left no trace in the reports: a constraint that removed paths nobody meant to remove. It tests whether you check coverage as well as violations, and whether you can trace a silicon failure back to the constraints. The four lessons give the situation, the investigation, the root cause and fixes, and the narration.
Lesson | After it you can... |
|---|---|
State the symptom and the first questions. | |
Find the exception by diffing and counting coverage. | |
Scope the exception and add a coverage gate. | |
Tell it with the framework, including the process change. |
It has no violation to chase: the evidence is an absence, and the candidate has to know that constraint coverage is part of signoff.