Worked example

Worked Example for ADC Digital Wrapper focuses on sample capture integrity, wrapper protocol violations, dropped-frame count. The goal is to connect observed symptom to boundary mechanism, ownership, and signoff risk.

A stress workload shows sample capture integrity, wrapper protocol violations, dropped-frame count. The first review mistake is broad blame. A better review tracks one boundary transition, validates contract assumptions, and proves the first failing mechanism in ADC Digital Wrapper.

Sequence under inspection

AMS BOUNDARY SEQUENCE — ADC Digital Wrapper

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

metric under watch: sample capture integrity, wrapper protocol violations, dropped-frame count

ADC wrapper bridge

sampler clock domain -> wrapper framing/sync -> system clock domain consumer

1. Capture tagged waveform/log/report set.

2. Mark mode boundary and first failure timestamp.

3. Map to contract and owner.

4. Compare against ADC wrapper spec, interface waveform packet, CDC audit.

5. Propose one reversible fix and predefine regression matrix.

Did the fix work?

BEFORE / AFTER — ADC Digital Wrapper

health score
  ^
  |                     --- target
  |         o regressed
  |               o before fix
  |                    o after bounded fix
  +--------------------------------------> debug iteration

Prove signal quality, timing margin, and integration safety together.

AMS deep dive

Wrapper and sampling contracts determine data trustworthiness.

Concept diagram

CONVERTER DATA FLOW

sampling clock -> wrapper -> sync boundary -> system consumer

Metric graph

INVALID SAMPLE BURSTS

time --->  _|¯¯|__|¯¯¯|____|¯|_

Reports and artifacts

• sample validity ratio

• calibration convergence

• CDC audit

• overflow/stale sample counters

Mini case study

Mode transition changed sample phase and invalidated wrapper framing assumptions.

Debug branches

• Sample timing contract

• Calibration hook behavior

• Wrapper CDC integrity

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

ADC wrappers bridge analog sampler behavior to synchronous digital domains with framing, synchronization, and error flags that preserve measurement validity.

Metric: sample capture integrity, wrapper protocol violations, dropped-frame count