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An implicit path-delay fault diagnosis methodology

The first nonenumerative framework for diagnosing path delay faults (PDFs) using zero suppressed binary decision diagrams is introduced. We show that fault-free PDFs with certain validated nonrobust test may be used together with fault-free robustly tested faults to eliminate faults from the set of suspected faults. All operations are implemented by an implicit diagnosis tool based on the zero-suppressed binary decision diagram. The proposed method is space and time nonenumerative as opposed to existing methods which are space and time enumerative. Experimental results on the ISCAS'85 benchmarks show that the proposed technique is on average three times more efficient than the existing techniques.