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Scan-based transition test

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2 Author(s)
Savir, J. ; IBM Corp., Hopewell Junction, NY, USA ; Patil, S.

Skewed-load transition test is a form of scan-based transition test where the second vector of the delay test pair is a one bit shift over the first vector in the pair. This situation occurs when testing the combinational logic residing between scan chains. In the skewed-load test protocol, in order not to disturb the logic initialized by the first vector of the delay test pair, the second vector of the pair (the one that launches the transition) is required to be the next (i.e., one-bit-shift) pattern in the scan chain. Although a skewed-load transition test is attractive from a timing point of view, there are various problems that may arise if this strategy is used. Here, several issues of skewed-load transition test are investigated. Issues such as transition test calculus, detection probability of transition faults, transition fault coverage, and enhancement of transition test quality are thoroughly studied

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:12 ,  Issue: 8 )

Date of Publication:

Aug 1993

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