Step-by-step analysis walkthrough

Use this when you own AMS Signoff Dashboard during an AMS war room.

1. Capture failing mode and environmental condition.

2. Pull synchronized waveform, logs, and report artifacts.

3. Mark first boundary where legal behavior diverges.

4. Audit reset/clock/power sequence assumptions.

5. Check physical coupling contributors (floorplan/power/package) where relevant.

6. Assign single-thread ownership for the first fix.

7. Propose bounded change and define success criterion.

8. Run scenario and safety regressions.

9. Document findings in closure memo.

10. Update signoff dashboard and waiver state.

Artifacts to collect

• AMS signoff dashboard, waiver tracker, release decision memo

• handoff contract

• firmware/config tag

• physical signoff snapshot

• decision memo

Decision memo template

AMS DECISION MEMO — AMS Signoff Dashboard
mode/condition:
metric:
hypothesis:
fix:
regression:
owners: signoff lead, program manager, AMS integration lead

Reference visuals

Cross-domain signoff dashboard

timing + noise + IR + SI + PV + bring-up evidence
                 -> unified readiness score

AMS deep dive

AMS signoff is a combined noise, IR, timing, and package decision.

Concept diagram

BOUNDARY SIGNOFF

noise + IR + package + timing -> release decision

Metric graph

RISK DASHBOARD

open blockers █████
waivers       ███

Reports and artifacts

• supply ripple spectrum

• IR around analog islands

• package PI summary

• release dashboard

Mini case study

IR hotspot at analog island caused jitter spikes only under burst traffic.

Debug branches

• Correlate droop and jitter

• Check package return path

• Validate mode-specific activity profile

Senior review question

Ask: what boundary condition proves this topic is actually closed?

Key takeaways

• State boundary, mode, and evidence tag with every claim.

• Always align analog, digital, and physical owners before signoff decisions.

Common pitfalls

• Fixing averages while tails still fail.

• Skipping package/supply evidence in jitter or SerDes issues.

• Shipping with waivers that lack owner and expiration criteria.

Principal AMS review addendum

A unified AMS dashboard ties timing, noise, IR, SI, PV, and bring-up evidence so release decisions are based on complete cross-team risk visibility.

Metric: cross-domain signoff readiness score, unresolved waivers, tapeout blockers