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The pseudoexhaustive test of sequential circuits

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2 Author(s)
Wunderlich, H. ; Inst. of Comput. Design & Fault Tolerance, Karlsruhe Univ., West Germany ; Hellebrand, S.

The concept of a pseudoexhaustive test for sequential circuits is introduced. Instead of test sets one applies pseudoexhaustive test sequences of a limited length, which provides well-known benefits as far as fault coverage, self-test capability, and simplicity of test generation are concerned. Some flip flops and latches are integrated into an incomplete scan path, such that each possible state of the circuit is reachable within a few steps. Some more flip flops and some new segmentation cells are added to the partial scan path in order to make a pseudoexhaustive test feasible. Algorithms for placing these devices automatically are presented. Also it is shown how to transform a pseudoexhaustive test set into a pseudoexhaustive test sequence of a similar size. The analyzed examples show that a conventional complete scan path without additional testability features requires more hardware overhead than the proposed test strategy, which retains all the known benefits of a pseudoexhaustive test

Published in:

Test Conference, 1989. Proceedings. Meeting the Tests of Time., International

Date of Conference:

29-31 Aug 1989

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