Resistive Bridge Fault Modeling, Simulation and Test Generation

  • Authors:
  • Vijay R. Sar-Dessai;D. M. H. Walker

  • Affiliations:
  • -;-

  • Venue:
  • ITC '99 Proceedings of the 1999 IEEE International Test Conference
  • Year:
  • 1999

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Abstract

In this work we develop models of resistive bridgingfaults and study the fault coverage on ISCAS85 circuits ofdifferent test sets using resistive and zero-ohm bridges atdifferent supply voltages. These results explain severalpreviously observed anomalous behaviors. In order toserve as a reference, we have developed the first resistivebridging fault ATPG, which attempts to detect themaximum possible bridging resistance at each fault site.We compare the results of the ATPG to the coverageobtained from other test sets, and coverage obtained byusing the ATPG in a clean-up mode. Results on ISCAS85circuits show that stuck-at test sets do quite well, but thatthe ATPG can still improve the coverage. We have alsofound that the loss of fault coverage is predominantly dueto undetected faults, rather than faults in which only asmall resistance is detected. This suggests that lower-costfault models can be used to obtain high resistive bridgefault coverage.