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DFT-08DFT Fundamentals & TestabilityPublished

Analyze Unknown-State Propagation

Trace how an X from an unreset register spreads through, or is masked by, logic in four-state simulation, compare X optimism with X pessimism, and watch a weak checker miss an unknown that a case-equality checker catches.

Foundation~75 min
Concepts covered
  • Four-state X semantics
  • Masking and propagation
  • X optimism vs pessimism
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