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Course contents

  • How to Use This Puzzle Bank
  • SystemVerilog Language Puzzles25
  • Difficulty Guide
  • Full Topic Map
  • Interview-Day Tips
  • Study Route: One Week Before the Interview
  • Study Route: Two Weeks
  • Study Route: Four Weeks (Full Course)4
  • OOP & Testbench Puzzles25
  • Concurrency & Timing Puzzles25
  • Randomization & Constraint Puzzles25
    • Constraint Solving Order Puzzles
    • Distribution Puzzles (`dist`, `:=` vs `:/`)
    • solve...before Bias Puzzles
    • randomize() with Puzzles
    • Randomization & Constraint Puzzles: Tricky Q&A
  • SVA Assertion Puzzles25
  • Functional Coverage Puzzles25
  • Logic & Aptitude Puzzles25
  • Scenario & Debug Puzzles25
  • UVM Testbench Puzzles25
  • Clock, Reset & CDC Puzzles25
  • Bus and Interface Protocol Puzzles25
  • Interview Prep: Puzzle Rounds7
  • DV Puzzle Cheatsheet
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←DV Interview Puzzles
  1. Topics
  2. DV Interview Puzzles
  3. Randomization & Constraint Puzzles
On this page

    VLSI DV Interview PuzzlesAll levels

    Randomization & Constraint Puzzles

    Puzzle-centric randomization interview drills focused on legal-set counting, solver bias, dist math, solve-before effects, and practical randomize() usage with inline constraints and hooks.

    • 5topics
    • 25lessons

    Topics in this section

    1. 1Constraint Solving Order Puzzles6 lessons
      • Implication vs Partitioned Branches
      • Bidirectional Solving of x+y==10
      • if-else with Overlap on One Value
      • randc Cycle with a Skipped Value
      • Width Wrap in a Sum Constraint
      • Array Size Coupled to Content
    2. 2Distribution Puzzles (`dist`, `:=` vs `:/`)6 lessons
      • Case A vs Case B vs Trap Variant
      • Small Range with := vs Large Range with :/
      • Soft Constraint Priority (a soft puzzle in the dist section)
      • dist After Hard Pruning
      • Boolean dist Cascading into Value dist
      • Zero Weight Means Never Chosen
    3. 3solve...before Bias Puzzles6 lessons
      • Classic a->b Bias Shift
      • Three-Branch Kind Selection
      • Reverse Bias with solve b before a
      • m<n Cardinality Bias
      • Mode Branch Collapse Under Extra Relation
      • Three-Variable solve-before Chain
    4. 4randomize() with Puzzles6 lessons
      • Inline Implication That Looks Like a Conflict
      • Constraint Override by Name in a Derived Class
      • unique and Array Element Counting
      • constraint_mode Changes Pass/Fail
      • rand_mode(0) Freezes Value and Can Overconstrain
      • pre_randomize Assignment vs Solver and post_randomize Call Count
    5. 5Randomization & Constraint Puzzles: Tricky Q&A1 lesson

    What this section covers

    Puzzle-centric randomization interview drills focused on legal-set counting, solver bias, dist math, solve-before effects, and practical randomize() usage with inline constraints and hooks.

    Topics

    Diagram
    Constraint Solving Order Puzzles — 6 puzzles
    Distribution Puzzles (`dist`, `:=` vs `:/`) — 6 puzzles
    solve...before Bias Puzzles — 6 puzzles
    randomize() with Puzzles — 6 puzzles

    How to practice

    1. Open each topic and attempt every puzzle cold, writing your predicted answer first.

    2. Only then read the step-by-step solution and confirm the exact answer.

    3. Re-read the 'why candidates get it wrong' note — that is the actual interview signal.

    4. Finish with the section Q&A to rehearse explaining the rule out loud.

    Related topics

    • VLSI DV Interview Puzzles hub

    PreviousNext: Constraint Solving Order Puzzles

    Up next

    Up nextConstraint Solving Order Puzzles

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    See also

    • How to Use This Puzzle Bank
    • SystemVerilog Language Puzzles
    • Difficulty Guide