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Space compression revisited

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5 Author(s)
Das, S.R. ; Fac. of Eng., Ottawa Univ., Ont., Canada ; Barakat, T.F. ; Petriu, E.M. ; Assaf, M.H.
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This paper discusses new space compression techniques for built-in self-testing (BIST) of VLSI circuits based on the use of compact test sets to minimize the storage requirements for the circuit under test (CUT) while maintaining the fault coverage information. The techniques utilize the concepts of Hamming distance and sequence weights along with failure probabilities of errors in the selection of specific gates for merger of pairs of output streams from the CUT. The outputs coming out of the space compressor may eventually be fed into a time compressor to derive the signature for the circuit. The concept is extended to establish generalized mergeability criteria for merging an arbitrary number of output bit streams under conditions of both stochastic independence and dependence of line errors. The proposed techniques guarantee rather simple design with high fault coverage for single stuck-line faults, with low CPU simulation time and acceptable area overhead. Design algorithms are also proposed, and the simplicity and ease of implementation are demonstrated with examples, primarily through extensive simulation runs on ISCAS 85 combinational benchmark circuits with FSIM, ATALANTA, and COMPACTEST. The paper also provides performance comparisons of the designed space compressors with the conventional linear parity tree space compressor

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:49 ,  Issue: 3 )

Date of Publication:

Jun 2000

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