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BIST test pattern generators for stuck-open and delay testing

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2 Author(s)
Chih-Ang Chen ; Dept. of Electr. Eng. Syst., Univ. of Southern California, Los Angeles, CA, USA ; Gupta, S.K.

Testing for delay and CMOS stuck-open faults requires two pattern tests and test sets are usually large. Built-in self-test (BIST) schemes are attractive for such comprehensive testing. The BIST test pattern generators (TPGs) for such testing should be designed to ensure high pattern-pair coverage. In this paper, necessary and sufficient conditions to ensure complete/maximal pattern-pair coverage for linear feedback shift register (LFSR) and cellular automata (CA) have been derived. The theory developed here identifies all LFSR/CA TPGs which maximize pattern-pair coverage under any given TPG size constraints. It is shown that LFSRs with primitive feedback polynomials with large number of terms are better for two-pattern testing. Also, CA are shown to be better TPGs than LFSRs for two-pattern testing. Results derived in this paper provide practical algorithms for the design of optimal TPGs for two-pattern testing. Experiments on some benchmark circuits indicate the TPGs designed using the procedures outlined in this paper provide much higher delay fault coverage than other TPGs

Published in:

European Design and Test Conference, 1994. EDAC, The European Conference on Design Automation. ETC European Test Conference. EUROASIC, The European Event in ASIC Design, Proceedings.

Date of Conference:

28 Feb-3 Mar 1994