Switch-level bridging fault simulation in the presence of feedbacks

  • Authors:
  • Peter Dahlgren

  • Affiliations:
  • -

  • Venue:
  • ITC '98 Proceedings of the 1998 IEEE International Test Conference
  • Year:
  • 1998

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Abstract

This paper investigates the degradation in detectabilityof bridging faults caused by situations of active feedbackand logically unresolvable intermediate values under differentfault modeling assumptions. A bridging fault simulatoris presented that is based on a combination of switch-levelmodeling and levelized logic simulation. Levelizedsimulation is efficient for fault propagation and feedbackanalysis, whereas the switch-level model is used for determiningwhether an intermediate value is logically resolvable.A method to extract the logic function of channelgraphs is presented in order to perform levelized processingof switch-level networks. The experimental results showthat active feedback may reduce fault coverage by as muchas 9% for stuck-at test sets and realistic bridging fault sets.