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Same/different fault dictionary: an extended pass/fail fault dictionary with improved diagnostic resolution

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2 Author(s)
Pomeranz, I. ; Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN ; Reddy, S.M.

A new type of fault dictionary called a same/different fault dictionary is described. The same/different fault dictionary is similar to a pass/fail fault dictionary in that it contains a single bit b i,j for every modelled fault f i and test vector t j. However, in a pass/fail fault dictionary, b i,j is determined by comparing the output vector of the faulty circuit with the output vector of the fault-free circuit; whereas in a same/different fault dictionary, b i,j is determined by comparing the output vector of the faulty circuit with a preselected output vector called a baseline output vector. By selecting appropriately the baseline output vectors for all the test vectors, it is possible to obtain increased diagnostic resolution with a same/different fault dictionary compared with a pass/fail fault dictionary. A heuristic procedure for selecting baseline output vectors is described and experimental results are presented.

Published in:

Computers & Digital Techniques, IET  (Volume:3 ,  Issue: 1 )

Date of Publication:

January 2009

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