Deadlock and Livelock Checks for Arbitration and Handshake Logic: Inputs and Outputs

Inputs and outputs contract

Inputs and Outputs for Deadlock and Livelock Checks for Arbitration and Handshake Logic is anchored on non-vacuous closure rate, counterexample turnaround, and residual-risk trend by requirement class. Convert outcomes into assumption-aware, evidence-backed actions.

INPUTS
  - requirement intent and risk tier
  - property scope and temporal contract
  - assumption model and reset policy
  - tool/engine metadata and reproducibility tags

OUTPUTS
  - evidence-backed root-cause classification
  - owner-signed mitigation proposal
  - validation matrix and rollback triggers
  - signoff recommendation

Ownership split

OWNERSHIP LAYERS - Deadlock and Livelock Checks for Arbitration and Handshake Logic

+----------------------+--------------------------------+--------------------------------+
| Team                 | Primary responsibility         | Closure artifact               |
+----------------------+--------------------------------+--------------------------------+
| formal verification owner | property and model integrity      | assumptions and proof packet   |
| rtl owner | implementation root-cause closure | RTL fix and replay evidence    |
| Formal Applications (Apps) owner | signoff governance and rollout    | risk memo + acceptance gates   |
+----------------------+--------------------------------+--------------------------------+

Formal deep dive

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

Concept diagram

FORMAL APPS MAP

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

Metric graph

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?

Key takeaways

• Tie each proof claim to assumption boundaries and reachability evidence.

• Prefer minimal reversible fixes and preserve legal behavior visibility.

Common pitfalls

• Treating runtime reduction as proof-quality improvement without audits.

• Declaring closure while critical covers remain unreachable.

• Using broad waivers instead of first-divergence root-cause ownership.

Handoff explanation

Inputs should include assumptions, reset semantics, and property intent classes.

Outputs should include counterexample classification, closure confidence, and residual-risk labeling.