3-Stage Variable Length Continuous-Flow Scan Vector Decompression Scheme

  • Authors:
  • C. V. Krishna;Nur A. Touba

  • Affiliations:
  • -;-

  • Venue:
  • VTS '04 Proceedings of the 22nd IEEE VLSI Test Symposium
  • Year:
  • 2004

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Abstract

This paper presents a 3-stage continuous-flow lineardecompression scheme for scan vectors that uses avariable number of bits to encode each vector. By using3-stages of decompression, it can efficiently compressany test cube (i.e., deterministic test vector where theunassigned bit positions are left as don't cares)regardless of the number of specified (care) bits. As aresult of this feature, there is no need for any constraintson the automatic test generation process (ATPG)process. Any ATPG can be used with any amount ofstatic or dynamic compaction. Experimental results areshown which demonstrate that the proposed schemeachieves extremely high encoding efficiency.