Inputs and outputs contract

Inputs & Outputs for Mixed-Signal Physical Verification focuses on AMS PV closure rate, signoff waiver count, rerun turnaround. The goal is to connect observed symptom to boundary mechanism, ownership, and signoff risk.

Treat these inputs and outputs as signed interface guarantees. Ambiguity here creates the most expensive integration bugs.

INPUTS
  - AMS handoff contract and spec revision
  - mode definitions (power/clock/reset/traffic)
  - wrapper and boundary-cell assumptions
  - physical constraints: keepouts, guard, package limits

OUTPUTS
  - mode-tagged metric report
  - owner-signed debug or closure note
  - waiver manifest with expiry and controls
  - release recommendation

Boundary sequence

AMS BOUNDARY SEQUENCE — Mixed-Signal Physical Verification

analog macro -> wrapper / boundary cell -> synchronizer or sampler -> digital consumer
      |                 |                         |                     |
  analog assumptions    legal voltage/state       clock/reset contract   protocol/data validity

metric under watch: AMS PV closure rate, signoff waiver count, rerun turnaround

Ownership map

OWNERSHIP MAP — Mixed-Signal Physical Verification

artifact                  owner
----------------------    -----------------------------
integration artifact    PV lead
implementation artifact analog layout owner
signoff artifact        program signoff owner

Every boundary issue needs a named owner before fixes start.

AMS deep dive

Physical proximity and boundary rules are functional constraints in AMS SoCs.

Concept diagram

INTEGRATION FLOW

floorplan keepouts -> guard strategy -> abutment policy -> PV signoff

Metric graph

INTEGRATION ESCAPES

layout boundary issues ███████
waiver drift           ████

Reports and artifacts

• keepout violations

• guard-ring checks

• abutment DRC

• mixed-signal PV dashboard

Mini case study

Late macro move violated quiet-zone assumptions and caused intermittent converter noise excursions.

Debug branches

• Review macro adjacency

• Re-check guard assumptions

• Re-run PV with correct deck variant

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

Mixed-signal PV combines digital and analog rule decks, LVS partition assumptions, and waiver discipline to achieve manufacturable signoff.

Metric: AMS PV closure rate, signoff waiver count, rerun turnaround