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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
  • RDC Signoff16
  • Debug and Case Studies11
  • CDC and RDC Interview Prep30
    • CDC/RDC Whiteboard Framework
      • The Answer Framework
      • Drawing a Crossing
      • Naming the Failure Mode
      • Grading Rubric
    • CDC/RDC Framework Drills
    • Scenario: Metastability Bug
    • Scenario: Metastability Escape in Silicon Bring-up
    • Scenario: Async FIFO Pointer Mismatch
    • Scenario: Waiver Debate
    • Scenario: RDC Waiver Under Tapeout Pressure
    • CDC/RDC Interview Q&A Bank
    • CDC/RDC Interview Q&A Bank (Expanded)
  • Capstone: Sign Off a Multi-clock Peripheral4
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‹CDC and RDC Interview Prep
  1. Topics
  2. CDC & RDC
  3. CDC and RDC Interview Prep
  4. CDC/RDC Whiteboard Framework

Part 10 · Interview Prep · All levels

CDC/RDC Whiteboard Framework

The four-step answer framework behind every strong CDC and RDC interview answer.

  • 4topics
  • 4lessons

Interviewers ask dozens of different CDC questions but listen for the same four things: what you assume, how the failure works, what the fix costs, and what evidence closes it. This topic teaches that answering habit, how to draw any crossing on a whiteboard, how to name the failure mode first, and how your answers are scored.

Lesson

After it you can...

The Answer Framework

Structure any CDC or RDC answer as Assumption, Mechanism, Trade-off, Evidence.

Drawing a Crossing

Draw launch flop, capture flop, clocks, and synchroniser on a whiteboard without prompting.

Naming the Failure Mode

Name the failure mode before proposing any fix.

Grading Rubric

Score an answer from 0 to 4 and say what a 4 sounds like.

Read them in order, then keep the framework visible while working the drills: every drill prompt in this section names which step it is exercising.

Check yourself What four things does every strong CDC interview answer contain?

Assumption, Mechanism, Trade-off, Evidence: what you assume about clocks and intent, how the failure works, what the fix costs, and what evidence closes it.

Related topics

  • Next: CDC/RDC Framework Drills

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See also

  • CDC/RDC Framework Drills
  • Scenario: Metastability Bug
  • Scenario: Metastability Escape in Silicon Bring-up