Test vector decompression via cyclical scan chains and its application to testing core-based designs

  • Authors:
  • Abhijit Jas;Nur A. Touba

  • Affiliations:
  • -;-

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

Quantified Score

Hi-index 0.01

Visualization

Abstract

A novel test vector compression/decompressiontechnique is proposed for reducing the amount of testdata that must be stored on a tester and transferred toeach core when testing a core-based design. A smallamount of on-chip circuitry is used to reduce both the teststorage and test time required for testing a core-baseddesign. The fully specified test vectors provided by thecore vendor are stored in compressed form in the testermemory and transferred to the chip where they aredecompressed and applied to the core (the compression islossless). Instead of having to transfer each entire testvector from the tester to the core, a smaller amount ofcompressed data is transferred instead. This reduces theamount of test data that must be stored on the tester andhence reduces the total amount of test time required fortransferring the data with a given test data bandwidth.