Structurally Synthesized Binary Decision Diagrams (SSBDDs) have an important characteristic property of keeping information about circuit's structure. Boolean difference of a circuit is used to find test pattern for stuck at fault in combinational circuit but the algebraic manipulation involved in solving Boolean difference is a tedious job. In this paper an efficient algorithm is proposed to compute Boolean difference and test patterns simply using searching the paths of SSBDD. This model reduces algebraic manipulations and takes less time to compute the test pattern.
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