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On identifying don't-care inputs of test patterns for logic circuits

机译:在识别逻辑电路测试图案的无关输入时

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摘要

Given a test set for stuck-at faults, some of primary input values may be changed to opposite logic values without losing fault coverage. One can regard such input values as don't care(X). In this paper, we propose a method for identifying X inputs of test vectors in a given test set. While there are many combinations of X inputs in the test set generally, the proposed method finds one including X inputs as many as possible, by using fault simulation and procedures similar to implication and justification of ATPG algorithms. Experimental results for ISCAS benchmark circuits show that approximately 66% of inputs of un-compacted test sets could be X. Even for compacted test sets, the method found that approximately 47% of inputs are X. Finally, we discuss how logic values are reassigned to the identified X inputs where several applications exist to make test vectors more desirable for solving problems of SoC testing.
机译:给定用于卡住故障的测试集,某些主要输入值可以更改为相反的逻辑值,而不会丢失故障范围。可以将这些输入值视为无关位(X)。在本文中,我们提出了一种在给定测试集中识别测试向量的X个输入的方法。虽然测试集中通常有X个输入的许多组合,但是所提出的方法通过使用故障模拟和类似于ATPG算法的含义和理由的过程,找到了尽可能多的X个输入。 ISCAS基准电路的实验结果表明,未压缩测试集的输入中大约有66%可能是X。即使对于压缩测试集,该方法也发现大约47%的输入是X。最后,我们讨论了如何重新分配逻辑值到已识别的X输入,其中存在多个应用程序,以使测试向量更理想用于解决SoC测试问题。

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