REDUCING TEST DATA VOLUME USING EXTERNAL/LBIST HYBRID TEST PATTERNS

  • Authors:
  • Debaleena Das;Nur A. Touba

  • Affiliations:
  • -;-

  • Venue:
  • ITC '00 Proceedings of the 2000 IEEE International Test Conference
  • Year:
  • 2000

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Abstract

A common approach for large industrial designs is touse logic built-in self-test (LBIST) followed by test datafrom an external tester. Because the fault coverage withLBIST alone is not sufficient, there is a need to top-up thefault coverage with additional deterministic test patternsfrom an external tester. This paper proposes a techniqueof combining LBIST and deterministic ATPG to form"hybrid test patterns" which merge pseudo-random anddeterministic test data. Experiments have been done onthe Motorola PowerPCTM microprocessor core to studythe proposed hybrid test patterns. Hybrid test patternsprovide several advantages: 1) can be applied usingSTUMPS architecture [Bardell 82] with a minormodification, 2) significantly reduce external test datastored in tester memory, 3) reduce the number of pseudorandompatterns by orders of magnitude, thus addressingpower issues.