CDC / RDC · All levels

CDC/RDC Interview Q&A Bank: Debug Playbook

Debug Playbook for CDC/RDC Interview Q&A Bank.

Debug playbook

Debug Playbook for CDC/RDC Interview Q&A Bank focuses on answer completeness, conceptual correctness, practical judgment. The goal is to convert issue observations into mechanism-backed closure decisions.

CDC/RDC debug is about finding the earliest violated assumption. Start with intent and context before touching low-level signal traces.

Root-cause tree

diagram

ROOT-CAUSE TREE — CDC/RDC Interview Q&A Bank

crossing failure observed
        |
   reproducible?
     /        \
   no          yes
   |            |
stress mode   classify issue
expansion       /      |      \
            synchronizer protocol reset/reconvergence
                 |         |           |
            MTBF fit    liveness    release ordering

Freeze RTL/config/tool tags for reproducibility.
Reproduce in smallest mode/reset/traffic scenario.
Classify mechanism: synchronizer, protocol, reset, reconvergence, or governance.
Collect one decisive artifact that proves the class.
Pick minimal fix or bounded waiver.
Run targeted and full-regression matrices before closure.

Review memo template

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STAFF CDC/RDC REVIEW MEMO — CDC/RDC Interview Prep / CDC/RDC Interview Q&A Bank

1. Symptom
   - Failing metric: answer completeness, conceptual correctness, practical judgment
   - Context: <mode, traffic, reset state, corner>
   - Risk class: <critical/high/medium/low>
   - Database tags: <rtl, config, assertions, tool setup>

2. Mechanism hypothesis
   - Primary mechanism: Deliberate practice across metastability, protocols, reset sequencing, and waivers builds repeatable senior-level responses.
   - Competing hypothesis: <false warning / protocol bug / reset order / reconvergence>
   - Missing evidence: <assertion, waveform, formal proof, stress replay>

3. Proposed action
   - Minimal reversible change: <sync/protocol/reset/waiver decision>
   - Expected metric movement: <critical count delta>
   - Regression risk: throughput, boot, latency, mode interaction

4. Signoff
   - Re-run artifact: Q&A bank, scoring rubric, replay notes
   - Required owners: candidate, mentor, hiring team
   - Final decision: fix, bounded waiver, or escalate

CDC/RDC deep dive

Interview performance reflects production signoff thinking quality.

Concept diagram

diagram

INTERVIEW FLOW

classify -> explain mechanism -> propose fix -> state regression

Metric graph

diagram

PRACTICE SCORE

session1 62%
session2 78%
session3 89%

Reports and artifacts

scenario completion
answer rubric scores
trap recovery quality

Mini case study

Candidate gave command-heavy answer but missed risk framing and waiver governance.

Debug branches

Use mechanism-first structure
name ownership and evidence
close with signoff decision

Senior review question

Ask: what evidence proves this risk is closed for silicon, not just tool-clean?

Key takeaways

State crossing class, assumptions, and owner with every issue.
Run structural and dynamic regressions after each fix.

Common pitfalls

Treating all warnings as equivalent risk.
Waiving issues without containment evidence.
Skipping reset and reconvergence stress after CDC fixes.

Practice this lesson