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Course contents

  • How to Use This Course
  • Reading Path
  • CDC/RDC Glossary
  • CDC/RDC Metrics Reference
  • CDC/RDC Interview Prep
  • CDC/RDC Signoff Cheatsheet
  • Clock Domains and Failure Modes8
  • Metastability and Synchronizers16
  • CDC Protocols and Handshakes16
  • Reconvergence and Gray Coding16
  • Reset Domain Crossing16
  • Architecture and Design Rules16
  • CDC Signoff Methodology24
    • CDC Tool Flow
    • CDC Constraints and STA
    • CDC Waiver Policy
      • When to Waive
      • Evidence for a Waiver
      • Waiver Review and Expiry
      • Waiver Anti-Patterns
    • CDC Review Gate
    • CDC Signoff Dashboard
    • Formal and Simulation CDC Verification
  • RDC Signoff16
  • Debug and Case Studies11
  • CDC and RDC Interview Prep30
  • Capstone: Sign Off a Multi-clock Peripheral4
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‹CDC Signoff Methodology
  1. Topics
  2. CDC & RDC
  3. CDC Signoff Methodology
  4. CDC Waiver Policy

Part 7 · CDC Signoff Methodology · Advanced

CDC Waiver Policy

When a CDC waiver is justified, what evidence it needs, how it is reviewed, and when it expires.

  • 4topics
  • 4lessons

Not every finding is a defect: quasi-static signals, proven protocols, and crossings that cannot occur all need a documented way to be accepted. The waiver policy is that way — a narrow, evidence-backed, expiring permission for a specific finding. This topic defines what may be waived, what the waiver must contain, who reviews it, and the anti-patterns that reviews exist to catch.

Lesson

After it you can...

When to Waive

Separate legitimate waiver classes from design defects.

Evidence for a Waiver

Assemble the evidence a waiver needs, using the template.

Waiver Review and Expiry

Route a waiver through review, scope it, and expire it on change.

Waiver Anti-Patterns

Recognise blanket, cosmetic, undocumented, and copy-forward waivers.

Check yourself What is a waiver, in one sentence?

A narrow, evidence-backed, expiring permission for a specific finding — not a fix, not a dismissal, and not transferable to any other finding.

Related topics

  • Start: When to Waive

  • Violation Classes

  • See also: Signoff Readiness

PreviousNext: When to Waive

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See also

  • CDC Tool Flow
  • CDC Constraints and STA
  • CDC Review Gate