TESTING OF CRITICAL PATHS FOR DELAY FAULTS

  • Authors:
  • Manish Sharma;Janak H. Patel

  • Affiliations:
  • -;-

  • Venue:
  • ITC '01 Proceedings of the 2001 IEEE International Test Conference
  • Year:
  • 2001

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Abstract

Testing the critical paths in a circuit is essential to coverdistributed delay and small delay defects in a manufacturedcircuit. However, in most circuits, only a small percentageof functionally irredundant critical paths (which can affectthe cycle time) are robustly testable. In this paper we proposethe covering of defects on untestable critical paths byrobustly testing the longest testable segments lying on thosepaths. This method is scalable to large circuits since thetask of segment delay fault test generation has complexitysimilar to path delay fault test generation. Experimental resultshave been given to demonstrate that significant additionalcoverage of defects on critical paths can be achievedusing this technique.