A Statistical Fault Coverage Metric for Realistic Path Delay Faults

  • Authors:
  • Wangqi Qiu;Xiang Lu;Jing Wang;Zhuo Li;D. M. H. Walker;Weiping Shi

  • Affiliations:
  • -;-;-;-;-;-

  • Venue:
  • VTS '04 Proceedings of the 22nd IEEE VLSI Test Symposium
  • Year:
  • 2004

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Abstract

The path delay fault model is the most realistic modelfor delay faults. Testing all the paths in a circuit achieves100% delay fault coverage according to traditional pathdelay fault coverage metrics. These metrics result inunrealistically low fault coverage if only a subset of pathsis tested, and the real test quality is not reflected. Forexample, the traditional path delay fault coverage of anypractical test for circuit c6288 is close to 0 because thiscircuit has an exponential number of paths. In this paper,a statistical and realistic path delay fault coverage metricis presented. Then the quality of several existing test sets(path selection methods) is evaluated in terms of local andglobal delay faults using this metric, in comparison withthe transition fault and traditional path delay faultcoverage metrics.