Bit-flipping BIST

  • Authors:
  • Hans-Joachim Wunderlich;Gundolf Kiefer

  • Affiliations:
  • Computer Architecture Lab, University of Stuttgart, Breitwiesenstr. 20-22, D-70565 Stuttgart, Germany;Computer Architecture Lab, University of Stuttgart, Breitwiesenstr. 20-22, D-70565 Stuttgart, Germany

  • Venue:
  • Proceedings of the 1996 IEEE/ACM international conference on Computer-aided design
  • Year:
  • 1997

Quantified Score

Hi-index 0.00

Visualization

Abstract

A scan-based BIST scheme is presented which guarantees complete fault coverage with very low hardware overhead. A probabilistic analysis shows that the output of an LFSR which feeds a scan path has to be modified only at a few bits in order to transform the random patterns into a complete test set. These modifications may be implemented by a bit-flipping function which has the LFSR-state as an input, and flips the value shifted into the scan path at certain times. A procedure is described for synthesizing the additional bit-flipping circuitry, and the experimental results indicate that this mixed-mode BIST scheme requires less hardware for complete fault coverage than all the other scan-based BIST approaches published so far.