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Course contents

  • How to Use This Course
  • Reading Paths
  • Glossary
  • Metrics Reference
  • Formal Cheat Sheet
  • Formal Foundations19
    • Formal versus Simulation
    • Transition Systems, Invariants and the Three Property Roles
    • Reset, Initial State and the First Cycle
    • Cone of Influence
    • The Formal Tool Flow, Vendor-Neutral
      • Anatomy of a Formal Harness
      • Tasks, Engines and Time Limits
      • Reading a Result Report
      • Model Fidelity and Unsupported Constructs
  • Properties and SVA16
  • Property Development and Constraints19
  • Proof Engines and Convergence23
  • Formal Applications20
  • Equivalence Checking14
  • Formal Coverage and Signoff15
  • Methodology and Debug13
  • Interview Prep15
  • Capstone: A Chip-Block Verification Lab24
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←Formal Foundations
  1. Topics
  2. Formal Verification
  3. Formal Foundations
  4. The Formal Tool Flow, Vendor-Neutral

Part 1 of 10Part 1 of 10/Formal FoundationsAll levels

The Formal Tool Flow, Vendor-Neutral

What a formal run looks like: harness, tasks, engines, depths, limits, reports, and model fidelity.

  • 4topics
  • 4lessons

Before any metric can be understood, the run itself must be visible: what is compiled, what drives the design, what a task and an engine and a depth are, what the report says, and where the proved model differs from the simulated one. This topic walks that flow in vendor-neutral terms, with one complete harness, one depth pair, one report parser, and one fidelity table.

Lesson

After it you can...

Anatomy of a Formal Harness

Build a complete harness: free inputs, reset, assumptions, assertions, covers, and parameters.

Tasks, Engines and Time Limits

Predict what changing depth, engine, time, or splitting properties does to a run.

Reading a Result Report

Parse a generic report into proven, counterexample, and inconclusive counts without misfiling.

Model Fidelity and Unsupported Constructs

Name where the proved model differs from simulation and what that costs.

Suggested order: top to bottom. Build the harness, learn the run controls, read the report, then distrust the model in exactly the right places.

Source plus harness is compiled and elaborated. Tasks for proof, bounded checks and covers run on the engines under depth and time limits. Each property reports a result, and failures or witnesses come with a trace.
The flow from source and harness through tasks and engines to per-property results and traces.
Check yourself Where does a time-out belong in the report counts?

Inconclusive: it is neither a proof nor a counterexample, and filing it elsewhere corrupts the signoff.

Related topics

  • Earlier: Free Initial State and the Reset Sequence

  • Later: Bounded versus Unbounded Proofs

PreviousNext: Anatomy of a Formal Harness

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See also

  • Formal versus Simulation
  • Transition Systems, Invariants and the Three Property Roles
  • Reset, Initial State and the First Cycle