Generates functional covergroups from spec analysis (register config space, FSM state/transition, error injection); parses coverage reports from VCS/Xcelium/Questa; classifies coverage gaps by root cause (missing_scenario, wrong_config, dead_code, sampling_issue, encoding_mismatch); drives iterative coverage-driven test generation with gap-to-stimulus mapping; detects plateaus after 2 consecutive rounds with <1% delta; enforces anti-cheating verification ensuring stimulus corresponds to spec-compliant DUT behavior; limits to 5 closure rounds per gap.
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