Chip-level RDC Closure: Interview Drills

Interview drills

Interview Drills for Chip-level RDC Closure focuses on top-level RDC open count, subsystem handoff completeness, integration churn. The goal is to convert issue observations into mechanism-backed closure decisions.

PROMPT
You see top-level RDC open count, subsystem handoff completeness, integration churn in Chip-level RDC Closure. Explain root cause and signoff decision.

STRONG ANSWER
1. Names crossing/reset class and context.
2. Explains Chip-level RDC closure depends on clean reset intent handoff from IPs and alignment between subsystem sequencing assumptions.
3. Requests SoC reset map, subsystem waiver list, integration closure report.
4. Chooses fix/waiver/escalation with regression plan.

WEAK ANSWER
Lists tool commands or generic advice without mechanism and risk framing.

Diagram to draw on whiteboard

SoC reset map

IP A reset tree ---IP B reset tree ----+--> SoC dependency graph
IP C reset tree ---/

Top-level closure fails when IP assumptions conflict.

Debug tree to narrate

ROOT-CAUSE TREE — Chip-level RDC Closure

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

CDC/RDC deep dive

RDC closure must connect IP assumptions to SoC reality.

Concept diagram

RDC CLOSURE

IP reset intent + SoC sequencing -> structural checks -> dynamic stress -> signoff

Metric graph

MILESTONE READINESS

M-2 55%
M-1 82%
M0  100%

Reports and artifacts

• top-level RDC opens

• reset simulation coverage

• chip integration blockers

• waiver backlog

Mini case study

Each IP was locally clean, but top-level sequencing violation created cross-subsystem boot intermittency.

Debug branches

• Audit subsystem assumptions

• stress chip-level reset scenarios

• close ownership gaps

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.

Principal CDC/RDC review addendum

Chip-level RDC closure depends on clean reset intent handoff from IPs and alignment between subsystem sequencing assumptions.

Metric: top-level RDC open count, subsystem handoff completeness, integration churn