A novel test methodology for core-based system LSIs and a testing time minimization problem

  • Authors:
  • Makoto Sugihara;Hiroshi Date;Hiroto Yasuura

  • Affiliations:
  • -;-;-

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

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Abstract

In this paper, we propose a novel test methodology forcore- based system LSIs. Our test methodology aims todecrease testing time for core-based system LSIs. Consideringtesting time reduction, our test methodology isbased on BIST and ATPG. The main contributions ofthis paper are summarized as follows.(i). BIST is eficiently combined with external testingto relax the limitation of the external primary inputsand outputs.(ii). External testing for one of cores and BISTs forthe others are performed in parallel to reduce thetotal testing time.(iii.). The testing time minimization problem for core-basedsystem LSIs is formulated as a combinatorialoptimization problem to select the optimal setof test vectors from given sets of test vectors foreach core.