On output response compression in the presence of unknown output values

  • Authors:
  • Irith Pomeranz;Sandip Kundu;Sudhakar M. Reddy

  • Affiliations:
  • Purdue University, W. Lafayette, IN;Intel Corp., Austin, TX;University of Iowa, Iowa City, IA

  • Venue:
  • Proceedings of the 39th annual Design Automation Conference
  • Year:
  • 2002

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Abstract

A circuit may produce unknown output values during simulation of an input sequence due to an unknown initial state or due to the existence of tri-state elements. For circuits tested using BIST, unknown output values make it impossible to determine a single unique signature for the fault free circuit. To accommodate unknown output values in a BIST scheme, we describe a procedure for synthesizing a minimal logic block that replaces unknown output values by a known constant. The proposed procedure ensures that the BIST scheme will be able to detect all the faults detectable by the input sequence applied to the circuit while allowing a single unique signature to be obtained.