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Course contents

  • Start Here4
  • UVM Foundations14
  • UVM Phases & Simulation Lifecycle26
  • Factory & Configuration15
  • Transaction-Level Modeling (TLM)13
  • UVM Sequences & Stimulus21
  • UVM Agents & Protocol VIP21
  • Environment & Test Classes11
  • Checking & Coverage in UVM21
  • UVM Register Abstraction Layer (RAL)22
  • Advanced UVM in Practice13
  • Debug & Regression10
  • Coding Practice47
    • How to Use This Course
    • Whiteboard Delivery Framework
    • Scoreboard Coding
    • Monitor & Driver Coding
    • Sequences Coding
      • Basic Sequence Body
      • Layered Virtual Sequence
      • Grab, Lock & Ungrab
      • Sequence Library Arbitration
      • Sequences Tricky Q&A
    • TLM & Analysis
    • RAL & Adapters
    • Factory & config_db
    • Phases & Objections
    • Env & Test Architecture
    • Debug Broken Testbench
    • Mock Interview Sets
    • Senior UVM Coding Cheat Sheet
  • Verification in Industry Practice10
  • Senior Prep: Architecture, Leadership and Interviews32
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←Sequences Coding
  1. Topics
  2. UVM Verification
  3. Coding Practice
  4. Sequences Coding
  5. Grab, Lock & Ungrab

UVM Coding PracticeSenior

Grab, Lock & Ungrab

Exclusive sequencer access for virtual sequences.

Interview prompt

When do you grab a sequencer? Sketch grab/ungrab in virtual seq.

Diagram
WHITEBOARD CHAIN

1. DECLARE    interfaces / types / ports you need
2. SKELETON   class extends + utils macro + key methods
3. MECHANISM  fill one critical method while narrating
4. PITFALL    name one bug juniors make on this pattern
5. TEST       how you would smoke-test the component
  • grab before layered traffic

  • ungrab in post_body

  • avoid nested grab deadlock

Common pitfalls

  • Forgot ungrab.

  • Two virtual seqs grab same sqr.

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See also

  • Basic Sequence Body
  • Sequences Tricky Q&A