Accumulator based deterministic BIST

  • Authors:
  • Rainer Dorsch;Hans-Joachim Wunderlich

  • Affiliations:
  • -;-

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

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Abstract

Most built-in self test (BIST) solutions requirespecialized test pattern generation hardware whichmay introduce significant area overhead and performancedegradation. Recently, some authors proposed test patterngeneration on chip by means of functional units also usedin system mode like adders or multipliers. These schemesgenerate pseudo-random or pseudo-exhaustive patterns forserial or parallel BIST. If the circuit under test contains randompattern resistant faults a deterministic test pattern generatoris necessary to obtain complete fault coverage.In this paper it is shown that a deterministic test set can beencoded as initial values of an accumulator based structure,and all testable faults can be detected within a given testlength by carefully selecting the seeds of the accumulator. AROM is added for storing the seeds, and the control logicof the accumulator is modified. In most cases the size ofthe ROM is less than the size required by traditional LFSR-basedreseeding approaches.