Low Hardware Overhead Scan Based 3-Weight Weighted Random BIST

  • Authors:
  • Seongmoon Wang

  • Affiliations:
  • -

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

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Abstract

Two noble scan based BIST architectures, namely parallelfixing and serial fixing BIST, which can be implemented atvery low hardware cost even for random pattern resistant circuitsthat have large number of scan elements, are proposed.Both of the proposed BIST schemes use 3-weight weightedrandom BIST techniques to reduce test sequence lengths byimproving detection probabilities of random pattern resistantfaults. A special ATPG is used to generate suitable test cubesets that lead to BIST circuits that require minimum hardwareoverhead. Experimental results show that the proposed BISTschemes can attain 100% fault coverage for all of benchmarkcircuits with drastically reduced test sequence lengths. Thisreduction in test sequence length is achieved at low hardwarecost even for benchmark circuits that have large number scaninputs.