On Achieving Complete Coverage of Delay Faults in Full Scan Circuits using Locally Available Lines

  • Authors:
  • Irith Pomeranz;Sudhakar M. Reddy

  • Affiliations:
  • -;-

  • Venue:
  • ITC '99 Proceedings of the 1999 IEEE International Test Conference
  • Year:
  • 1999

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Abstract

We propose a testability enhancement technique for delayfaults in standard scan circuits that does not involve modificationsto the scan chain. Extra logic is placed on next-statevariables, and if necessary, on primary inputs, andcan be resynthesized with the circuit to minimize its hardwareand performance overheads. The proposed techniqueallows us to achieve complete coverage of detectabledelay faults. A simple test generation procedure that guaranteescomplete coverage when used with the proposedtechnique is also described.