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Course contents

  • How to Use This Puzzle Bank
  • SystemVerilog Language Puzzles25
  • Difficulty Guide
  • Full Topic Map
  • Interview-Day Tips
  • OOP & Testbench Puzzles25
  • Concurrency & Timing Puzzles25
  • Randomization & Constraint Puzzles25
  • SVA Assertion Puzzles25
  • Functional Coverage Puzzles25
  • Logic & Aptitude Puzzles25
  • Scenario & Debug Puzzles25
  • Interview Prep: Puzzle Rounds5
    • Framework for Any Unseen Puzzle
    • Scenario: Testbench Hang
    • Scenario: Constraint No-Solution
    • Scenario: Vacuous Assertion Pass
    • Scenario: Coverage Not Closing
  • DV Puzzle Cheatsheet
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‹Interview Prep: Puzzle Rounds
  1. Topics
  2. DV Interview Puzzles
  3. Interview Prep: Puzzle Rounds
  4. Scenario: Vacuous Assertion Pass

VLSI DV Interview Puzzles · All levels

Scenario: Vacuous Assertion Pass

An SVA check reports clean passes in dashboard summaries, yet silicon-like stress traces reveal protocol behavior that should violate intent under burst corner conditions.

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    Scenario

    An SVA check reports clean passes in dashboard summaries, yet silicon-like stress traces reveal protocol behavior that should violate intent under burst corner conditions.

    What to observe

    High assertion pass rate paired with low antecedent hit coverage in failing workload classes.

    Common traps

    • Treating pass counts as proof of behavior without checking antecedent activation.

    • Using overly restrictive disable conditions that prevent property engagement.

    • Closing signoff on assertion status alone instead of correlating with cover properties.

    Related topics

    • Back to Interview Prep

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    Next: Scenario: Coverage Not Closing

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    See also

    • Framework for Any Unseen Puzzle
    • Scenario: Testbench Hang