Test Point Insertion for Compact Test Sets

  • Authors:
  • M. J. Geuzebroek;J. Th. van de Linden;A. J. van de Goor

  • Affiliations:
  • -;-;-

  • Venue:
  • ITC '00 Proceedings of the 2000 IEEE International Test Conference
  • Year:
  • 2000

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Abstract

Efficient production testing is frequently hampered because(cores in) current complex digital circuit designs requiretoo large test sets, even with powerful ATPG tools thatgenerate compact test sets. Built-In Self-Test approachesoften suffer from fault coverage problems, due torandom-resistant faults, which can successfully be improved bymeans of Test Point Insertion (TPI). In this paper, we evaluatethe effect of TPI for BIST on the compactness of ATPGgenerated test sets and it turns out that most often a significanttest set size reduction can be obtained. We alsopropose a novel TPI method, specifically aiming at facilitatingcompact test generation, based on the 'test counting'technique. Experimental results indicate that the proposedmethod results in even larger, and moreover, more consistentreduction of test set sizes.