Interface Protocols · All levels

Protocol Verification & Compliance

VIP architecture, scoreboards, compliance suites, assertions, coverage, waveform-first debug, and signoff-quality protocol closure.

Section goal

VIP architecture, scoreboards, compliance suites, assertions, coverage, waveform-first debug, and signoff-quality protocol closure.

How to study this section

Start with the topic hub to learn the contract.
Use mechanism and reports pages to connect rules to metrics.
Use debug and worked-example pages for interview and on-call practice.
Close with checklist and PPA impact before signing any change.

Topics

vip-and-agent-architecture/ — VIP & Agent Architecture
scoreboard-and-checker-strategy/ — Scoreboard & Checker Strategy
compliance-and-coverage-plan/ — Compliance & Coverage Plan
protocol-waveform-debug/ — Protocol Waveform Debug

Protocol deep dive

Verification closes the gap between 'works in directed test' and 'legal under all stressed traffic'.

Concept diagram

diagram

VERIFICATION CLOSURE LOOP

spec clause -> test -> assertion -> coverage -> waiver -> signoff
                  ^                           |
                  +--------- gap found --------+

Metric graph

diagram

COVERAGE vs ESCAPE RATE

escapes
  |*
  | *
  |  *
  |   **  <- knee: more random helps
  |     ****
  +----------------> constrained-random depth

Metrics and artifacts to collect

compliance pass rate
coverage closure
scoreboard mismatch rate
assertion fire count
waiver log

Mini case study

Block passed VIP compliance but chip failed: system test omitted cross-master ID reuse through a bridge. Scoreboard key did not include upstream port ID.

Debug branches

If VIP pass but silicon fail, check integration assumptions.
If scoreboard noisy, fix key (ID+port+addr).
If coverage plateau, add compliance gap analysis not more repeats.

Senior review question

Ask: what is the first transaction that deviates, and which spec rule does it test?

Practice this lesson

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