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Flip-flop sharing in standard scan path to enhance delay fault testing of sequential circuits

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2 Author(s)
Hurst, J.P. ; Center for Digital Syst. Eng., Res. Triangle Inst., Research Triangle Park, NC, USA ; Kanopoulos, N.

This paper addresses the problem of testing for delay faults in sequential circuits which incorporate standard scan path design. The technique presented here aims at the reduction or elimination of enhanced-scan flip-flops and their associated overhead. Flip-flop sharing modifies the order of the flip-flops in the scan path such that adjacent flip-flops along the path are from different sequential machines. This allows the application of arbitrary two-vector test sets necessary for delay fault testing. This arrangement is feasible for practical circuits because today's complex ICs consist, in general, of many sequential machines that may need to be delay testable

Published in:

Test Symposium, 1995., Proceedings of the Fourth Asian

Date of Conference:

23-24 Nov 1995

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