DenseChip

DFT / ATPG · All levels

DFT Whiteboard Framework: Step-by-Step Walkthrough

Step-by-Step Walkthrough for DFT Whiteboard Framework.

Step-by-step analysis walkthrough

Use when you own DFT Whiteboard Framework in a DFT closure review.

  1. Open release criteria and failing metric dashboard.

  2. Partition failures by pattern family and operating context.

  3. Inspect constraints, clocks, masks, and unknown handling.

  4. Check architecture assumptions against implementation reality.

  5. Review diagnosis evidence for repeatability.

  6. Assign owner and propose smallest high-confidence change.

  7. Run timing, power, and quality regressions.

  8. Capture final signoff or waiver decision.

Artifacts to collect

  • whiteboard template, rubric checklist, mock interview notes

  • pattern tag manifest

  • tester program revision

  • signoff checklist

  • owner tracker

Decision memo template

diagram
DFT DECISION MEMO - DFT Whiteboard Framework
scenario:
metric:
hypothesis:
fix:
regression:
owners: candidate, DFT interviewer, hiring panel

Reference visuals

Interview answer spine

diagram
architecture -> controllability/observability -> constraints -> metrics -> debug -> signoff

DFT deep dive

Senior DFT interviews test tradeoff judgment under imperfect data.

Concept diagram

diagram
INTERVIEW ANSWER LOOP

state metric -> explain mechanism -> request evidence -> propose fix -> list regression

Metric graph

diagram
ANSWER QUALITY

mechanism clarity + ownership clarity + regression discipline

Reports and artifacts

  • whiteboard rubric

  • scenario scorecard

  • trap checklist

  • follow-up depth index

Mini case study

Candidate improved from tool-only answers to mechanism-first narratives by using metric->artifact->decision template.

Debug branches

  • Always state assumptions

  • Name cross-team owners

  • Discuss risk and fallback plan

Senior review question

Ask: what evidence proves this DFT decision is safe for production?

Key takeaways

  • State metric, lot/corner context, and pattern tag with every claim.

  • Treat timing, power, and quality as one signoff problem.

Common pitfalls

  • Chasing coverage without legality checks.

  • Ignoring test-power side effects of pattern changes.

  • Debugging silicon without reproducible tags.

Principal DFT review addendum

Strong DFT interviews follow a repeatable chain: architecture intent, controllability/observability, constraints, quality metrics, and debug loop.

Metric: interview answer structure quality, mechanism clarity, tradeoff articulation

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