On Improving the Stuck-at Fault Coverage of Functional Test Sequences by Using Limited-Scan Operations

  • Authors:
  • Irith Pomeranz;Sudhakar M. Reddy

  • Affiliations:
  • -;-

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

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Abstract

Functional test sequences were shown to detect uniquedefects in VLSI circuits. This is thought to be due to thefact that they are applied at-speed. However, functionaltest sequences do not achieve complete stuck-at fault coverage.Therefore, scan-based stuck-at tests, as well asother types of tests, are typically also applied. Thisincreases the amount of test resources required for testapplication. We describe a procedure for inserting (limited)scan operations into a functional sequence in order toimprove its stuck-at fault coverage, thus reducing or eliminatingthe need for separate scan-based stuck-at tests.Between scan operations, the functional sequence is stillapplied at-speed; however, a higher stuck-at fault coverageis achieved.