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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
    • 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 & RDC
  1. Topics
  2. CDC & RDC
  3. CDC Signoff Methodology

Part 7 · CDC Signoff Methodology · Advanced

CDC Signoff Methodology

The CDC signoff loop: tool flow, constraints and timing, waivers, review gates, dashboards, and formal and simulation checks.

  • 6topics
  • 24lessons

CDC signoff is the methodology that turns “we synchronised the crossings” into evidence: a reviewed setup, a classified structural inventory, timing constraints that mean what they say, waivers with proof, gates with criteria, honest dashboards, and dynamic checks behind the structure. This section teaches that methodology end to end. Circuit-level synchroniser design lives in the RTL course; this section assumes it and asks whether every crossing has the right one, with proof.

Learning path through the six CDC signoff methodology topics.
Suggested order. Flow first, then constraints, waivers, gates, dashboards, with formal and simulation alongside the gates.

The six topics

Topic

Lessons

After it you can...

CDC Tool Flow

4

Run the setup-analyse-classify-fix loop and choose hierarchical versus flat analysis.

CDC Constraints and STA

4

Judge clock-group and false-path exceptions and review constraints against the inventory.

CDC Waiver Policy

4

Write, evidence, review, and expire waivers — and spot the anti-patterns.

CDC Review Gate

4

Run gates with checklists, judge readiness, and hand off to implementation and test.

CDC Signoff Dashboard

4

Track, read, and defend honest signoff metrics across revisions.

Formal and Simulation CDC Verification

4

Combine formal, injection, and gate-level checks in regression with ownership.

Tip

Study in order: each topic assumes the previous one's vocabulary — setup, then constraints, then waivers, then gates, then dashboards, with dynamic methods alongside.

Check yourself What does this section prove that a clean timing report does not?

That every crossing is synchronised, constrained, waived-with-evidence, or fixed — timing passing only shows the synchronous paths meet their numbers.

Interview

Typical screening questions from this section: walk the CDC loop, defend a waiver, read a dashboard honestly, and say what synthesis can break.

Related topics

  • Up: CDC/RDC course hub

  • Start: CDC Tool Flow

  • Glossary

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See also

  • How to Use This Course
  • Reading Path
  • CDC/RDC Glossary