Formal Verification · All levels

Formal Applications (Apps)

Practical formal apps used in production SoCs: connectivity and pin-mux correctness, CSR access-policy verification, deadlock and livelock progress checks, and X-propagation/reset signoff with assumption hygiene and actionable debug traces.

Section goal

How to study this section

Start with each topic hub and restate the requirement intent in your own words.
Use reports and debug pages to classify first divergence accurately.
Practice worked examples and interview drills with fixed run metadata.
Close with checklist and residual-risk framing before signoff claims.

Topics

connectivity-checking/ - SoC Connectivity and Pin-Mux Formal Checking
control-register-verification/ - CSR and Control-Register Access Verification
deadlock-livelock-checks/ - Deadlock and Livelock Checks for Arbitration and Handshake Logic
x-propagation-formal/ - X-Propagation and Reset Verification with Formal

Formal deep dive

Formal apps generate high confidence when app-specific assumptions mirror integration and firmware behavior.

Concept diagram

diagram

FORMAL APPS MAP

connectivity + csr + progress + reset/x checks -> integrated SoC confidence

Metric graph

diagram

APPS CLOSURE QUALITY

functional app closure   ███████
environment realism      █████
waiver pressure          ███

Metrics and artifacts to collect

connectivity route reachability
CSR semantic correctness matrix
progress guarantee closure by interface
reset/X convergence confidence

Mini case study

Deadlock traces were resolved by tightening fairness assumptions to architecture contracts, not by weakening liveness guarantees.

Debug branches

Validate mode and configuration constraints for each app.
Pair safety and liveness checks for progress-sensitive logic.
Add first-transaction covers for reset-sensitive interfaces.

Senior review question

Ask: which requirement intent is proven, under which assumptions, and what residual risk remains?

Practice this lesson

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