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Why cellular automata are better than LFSRs as built-in self-test generators for sequential-type faults

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4 Author(s)
Zhang, S. ; Dept. of Comput. Sci., Victoria Univ., BC, Canada ; Byrne, R. ; Muzio, J.C. ; Miller, D.M.

This paper presents a combinatorial method of evaluating the effectiveness of linear hybrid cellular automata (LHCA) and linear feedback shift registers (LFSR) as generators for stimulating faults requiring a pair of vectors. We provide a theoretical analysis and empirical comparisons to see why the LHCAs are better than the LFSRs as generators for sequential-type faults in a built-in self-test (BIST) environment. Based on the concept of a partner set, the method derives the number of distinct k-cell substate vectors which have 22k, 1⩽k⩽[n/2], transition capability for an n-cell LFSR and an n-cell LFSR with maximum length cycles. Simulation studies of the ISCAS85 benchmark circuits provide evidence of the effectiveness of the theoretical metric

Published in:

Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on  (Volume:1 )

Date of Conference:

30 May-2 Jun 1994