Design space exploration

For Tapeout Readiness Review, integration options trade schedule velocity, silicon risk, and closure confidence.

Option A — conservative

• Conservative contracts: helps predictability

• Risk: slower early iteration

• Validate with: first-pass integration

Option B — balanced

• Balanced governance: helps reasonable velocity

• Risk: needs discipline

• Validate with: mature program

Option C — aggressive

• Aggressive shortcuts: helps short-term speed

• Risk: late escapes

• Validate with: last-resort crunch

Option D — architectural

• Architectural rework: helps structural fix

• Risk: schedule impact

• Validate with: systemic issues

DESIGN SPACE — Tapeout Readiness Review
risk <-> velocity <-> closure confidence

Design pitfalls

• Unowned risks

• Fixes without manifest-locked regression

Tradeoff curve

BEFORE / AFTER FIX — Tapeout Readiness Review

risk index
 0 |                    --- target
40 |    ● regression
65 |         ● before fix
20 |              ● after fix
    +-------------------------------> iteration
Always verify collateral, regression suite, and owner signoff.

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

Tapeout readiness is an executive review that validates technical closure, reproducibility, and contingency posture before irreversible handoff.

Metric: tapeout checklist pass rate, late blocker count