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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
      • The Generic CDC Flow
      • Setup: Clocks, Resets and Intent
      • Violation Classes
      • Hierarchical versus Flat Analysis
    • 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 Signoff Methodology
  1. Topics
  2. CDC & RDC
  3. CDC Signoff Methodology
  4. CDC Tool Flow

Part 7 · CDC Signoff Methodology · Advanced

CDC Tool Flow

The generic CDC signoff flow: setup, structural analysis, classification, fix, re-run, and signoff.

  • 4topics
  • 4lessons

Clock-domain crossing signoff follows the same loop on every project: describe the clocks and intent, run structural analysis over the whole design, classify each finding, fix the design or constrain it, and re-run until nothing unexplained remains. This topic walks that loop once, slowly, so the later topics can assume it.

Lesson

After it you can...

The Generic Flow

Name the stages of the CDC loop and what each stage consumes and produces.

Setup: Clocks, Resets and Intent

List what setup the analysis needs and predict false-clean versus false-noise failures.

Violation Classes

Read a finding, judge its severity, and name the typical fix.

Hierarchical versus Flat Analysis

Choose block-level versus flat analysis and name what each cannot prove.

Check yourself Where does a CDC loop always start, and why?

With setup: the clock list, their relationships, resets, and design intent. Every later stage trusts the setup, so a wrong setup makes every result suspect.

Related topics

  • Start: The Generic Flow

  • Next: CDC Constraints and STA

  • See also: CDC Review Gate

PreviousNext: The Generic CDC Flow

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Up nextThe Generic CDC Flow

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See also

  • CDC Constraints and STA
  • CDC Waiver Policy
  • CDC Review Gate