Interview drills

Interview Drills for Top-Level Closure Dashboard focuses on open critical signoff items, closure burn-down trend. The goal is to map symptoms to boundary contracts, owner actions, and regression-proof closure.

PROMPT
You observe open critical signoff items, closure burn-down trend in Top-Level Closure Dashboard. Explain root cause and closure plan.

STRONG ANSWER
1. Names baseline manifest and failing boundary.
2. Explains A closure dashboard unifies timing, power, DRC/LVS, CDC/RDC, and verification readiness into a decision-grade tapeout view.
3. Requests closure dashboard, risk burndown chart, owner status report.
4. Proposes minimal reversible fix + full regression scope.

WEAK ANSWER
Suggests broad optimizations or owner blame without baseline and artifact evidence.

Diagram to draw on whiteboard

Closure dashboard view

CLOSURE DASHBOARD

timing:   open/closed
power:    open/closed
phys:     DRC/LVS status
CDC/RDC:  waiver state
verification: signoff status

Root-cause tree to narrate

ROOT-CAUSE TREE — Top-Level Closure Dashboard

open critical signoff items, closure burn-down trend regressed
         |
   same baseline manifest?
      /           \
    no             yes
    |               |
version/collateral  real integration
mismatch            contract break
 /       \            |
inputs    env      isolate domain
drift     drift    and first failure

SoC deep dive

Signoff confidence depends on evidence quality and reproducibility discipline.

Concept diagram

SIGNOFF DECISION FLOW
metrics -> manifest -> waivers -> executive review

Metric graph

OPEN CRITICALS OVER TIME
week1 █████████
week2 █████
week3 ██

Reports and artifacts

• closure dashboard

• signoff manifest

• waiver aging report

• TRR checklist

Mini case study

A near-tapeout risk was caught when manifest mismatch invalidated an apparently green closure report.

Debug branches

• Validate manifest integrity

• Bound waiver risk

• Audit cross-domain owner approvals

Senior review question

Ask: what baseline, owner, and artifact prove this topic is truly closed?

Key takeaways

• State baseline manifest and owner with every closure metric.

• Run cross-domain regression after every top-level fix.

Common pitfalls

• Comparing results across different manifests.

• Unowned issues slipping through review cycles.

• Waiving risks without expiry and validation plan.

Principal SoC review addendum

A closure dashboard unifies timing, power, DRC/LVS, CDC/RDC, and verification readiness into a decision-grade tapeout view.

Metric: open critical signoff items, closure burn-down trend