TWO-DIMENSIONAL TEST DATA COMPRESSION FOR SCAN-BASED DETERMINISTIC BIST

  • Authors:
  • Hua-Guo Liang;Sybille Hellebrand;Hans-Joachim Wunderlich

  • Affiliations:
  • -;-;-

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

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Abstract

In this paper a novel architecture for scan-basedmixed mode BIST is presented. To reduce the storagerequirements for the deterministic patterns it relies on atwo-dimensional compression scheme, which combinesthe advantages of known vertical and horizontal compression techniques. To reduce both the number of patterns to be stored and the number of bits to be stored foreach pattern, deterministic test cubes are encoded asseeds of an LFSR (horizontal compression), and the seedsare again compressed into seeds of a folding countersequence (vertical compression). The proposed BISTarchitecture is fully compatible with standard scan design, simple and flexible, so that sharing between severallogic cores is possible. Experimental results show thatthe proposed scheme requires less test data storage thanpreviously published approaches providing the sameflexibility and scan compatibility.