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Theory and application of GF(2p) cellular automata as on-chip test pattern generator

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7 Author(s)
Sikdar, B.K. ; Dept. of Comput. Sci. & Technol., Bengal Eng. Coll. (D.U.), West Bengal, India ; Paul, K. ; Biswas, G.P. ; Boppana, V.
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This paper sets a new direction for test solution of VLSI circuits. The solution is based on the theory of extension field-that is, extension of finite field commonly referred to as Galois field (GF). The GF(2) with the set {0,1} traditionally employed in the digital domain has been extended in the present work to GF(2p) with elements from the set {0,1,2,…,2p-1}. The conventional on-chip LFSR/cellular automata (CA) based test pattern generators built around GF(2) elements have been replaced with the cellular structure of CF(2p) CA. The inter-cell connections and the value of p of a regular, modular and cascadable structure of GF(2p) CA can be tuned to maximize the fault coverage in a CUT (circuit under test). Availability of RTL/functional description of the CUT leads to a better tuning. The fault coverage figures obtained with GF(2p) CA based test pattern generator on the benchmark circuits and a few commercial circuits can be found to be significantly better than the best results reported so far with LFSR, GLFSR or GF(2) CA. The small set of uncovered faults can be handled with the introduction of a limited number of observation and test points. Area overhead for CATPG can be significantly reduced through the scheme of folding introduced in this paper

Published in:

VLSI Design, 2000. Thirteenth International Conference on

Date of Conference:

2000

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