How do you make the final floorplan proceed, iterate, waive, or return decision?

Short Answer

This is the moment where a pile of reports has to become one owned engineering decision — the gate isn't about running more checks, it's about someone actually deciding what happens next and being accountable for that call. Proceed only when the fundamentals are physically credible and reproducible: boundaries, rows, macro legality, feasible channels, constrained pins, feedthrough classification, tracks, PG reservation, voltage-area legality, congestion, and early timing all have to hold up, not just look fine at a glance.

Technical Explanation

• Classify every finding into one of five buckets before deciding anything: a hard stop (blocks proceeding, no exceptions), a design-intent question (needs an answer from whoever owns that decision, not a guess), a quality risk (proceed is possible but risky and should be tracked), an expected/known warning (documented and accepted), or a genuine waiver (explicitly justified, not just ignored).
• Iterate when a quality risk is real enough that proceeding now would likely cost more later than fixing it now — this is a judgment call about where you are in the schedule, not a rule you can apply mechanically.
• Waive only when there's an actual justification you can defend later — "we ran out of time" is not a waiver, it's an unmanaged risk wearing a waiver's clothes.
• Return upstream when the defect genuinely originates outside the floorplan's control — a netlist error, a wrong library assumption, a missing constraint — send it back to the owner who can actually fix the root cause rather than working around it locally.
• The discipline that makes this repeatable: reopen the written floorplan record and actually reproduce the evidence behind each finding before signing off — don't take last week's report on faith.

Formula Or Decision Rule

Decision rule: no unexplained hard stop; every open risk has evidence, owner, action, and review date.

What To Check

• Warning sign: A clean automated check is treated as approval.
• Inspect: choose one affected region, macro, row, pin, path, or net and trace the physical cause.
• Correct: Run the staged gate, inspect quality reports, record dispositions, reload the write-out, and sign the decision matrix.

Healthy, Suspicious & Hard-stop Results

• Healthy: Proceed only when boundaries, rows, macros, channels, pins, feedthroughs, tracks, PG reservation, voltage areas, congestion, and early timing are physically credible and reproducible. Iterate quality risks, waive only justified intent, and return upstream defects to their owner.
• Hard stop: required legality or physical feasibility is missing or unexplained.

What The Interviewer Is Testing

” to measurable physical evidence and an owned correction.

Follow-up Question & Model Response

"* Candidate Model Response: Model response: “I would change it if the same controlled rerun shows that a clean automated check is treated as approval. ”