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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
    • 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
      • The Scenario
      • What You Would Do
      • Communicating the Risk
    • 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. Scenario: RDC Waiver Under Tapeout Pressure

Part 10 · Interview Prep · All levels

Scenario: RDC Waiver Under Tapeout Pressure

Twenty open reset crossings with 36 hours to the milestone: what to do and how to say it.

  • 3topics
  • 3lessons

The programme requests waivers for twenty reset crossings judged low frequency, with a milestone in 36 hours. Verification has partial evidence; the integration team worries about boot sequencing on one product variant. This generic, illustrative scenario rehearses triage under pressure: sorting the twenty, refusing the unprovable, and communicating the remainder without either panic or false comfort.

Lesson

After it you can...

The Scenario

Sort twenty open RDC items by what each one actually needs.

What You Would Do

Triage in 36 hours: fix, evidence, conditional waiver, or refuse.

Communicating the Risk

Report the position to leadership honestly and in writing.

The traps: approving waivers without containment evidence, treating schedule urgency as technical justification, and ignoring the chip-level reset dependency graph.

Check yourself Why is "low frequency" not a waiver argument for reset crossings?

Resets assert rarely but release everything at once: the risk is per-release ordering and synchronisation, not per-cycle activity. Frequency bounds nothing about a boot-sequence failure.

Related topics

  • Next: CDC/RDC Interview Q&A Bank

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See also

  • CDC/RDC Whiteboard Framework
  • CDC/RDC Framework Drills
  • Scenario: Metastability Bug