AMS Handoff Contract: Interview Drills

Interview drills

Interview Drills for AMS Handoff Contract focuses on handoff completeness score, late-change churn, integration escape count. The goal is to connect observed symptom to boundary mechanism, ownership, and signoff risk.

PROMPT
You see handoff completeness score, late-change churn, integration escape count on AMS Handoff Contract. Walk through root cause and fix.

STRONG ANSWER
1. Names boundary and mode.
2. Explains A complete AMS handoff defines legal clocks, resets, power states, wrapper assumptions, and validation evidence so digital integration does not guess analog intent.
3. Requests AMS handoff package, interface spec matrix, signoff checklist.
4. Proposes one bounded fix and full regression.

WEAK ANSWER
Jumps to random tuning or tool commands without proving mechanism and ownership.

Diagram to draw on whiteboard

Handoff contract matrix

clock/reset assumptions + interface timing + power states + waivers
                         |
                    signed handoff package
                         |
              deterministic digital integration

Root-cause tree to narrate

ROOT-CAUSE TREE — AMS Handoff Contract

handoff completeness score, late-change churn, integration escape count regressed
        |
same silicon / run tags?
   /            \
 no              yes
 |                |
env mismatch    boundary contract or
tag mismatch    true physical issue
 /   \             |
clk   reset      isolate first failing
map   sequence   boundary transition

AMS deep dive

Boundary assumptions must be explicit, versioned, and testable.

Concept diagram

BOUNDARY CONTRACT FLOW

analog intent -> boundary implementation -> digital wrapper -> signed review

Metric graph

BOUNDARY RISK MIX

missing boundary cells    ███████
stale handoff assumptions ██████
silent mode changes       ████

Reports and artifacts

• boundary-cell coverage

• isolation/ESD review

• handoff contract checklist

• integration waiver log

Mini case study

Noise bursts traced to missing isolation clamp on one low-power transition mode.

Debug branches

• Validate boundary-cell insertion

• Diff handoff assumptions

• Reproduce with tagged mode sequence

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 complete AMS handoff defines legal clocks, resets, power states, wrapper assumptions, and validation evidence so digital integration does not guess analog intent.

Metric: handoff completeness score, late-change churn, integration escape count