Detection of bridging faults in logic resources of configurable FPGAs using I_DDQ

  • Authors:
  • L. Zhao;D. M. H. Walker;Fabrizio Lombardi

  • Affiliations:
  • -;-;-

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

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Abstract

This paper presents an IDDQ-based test strategy for detectingbridging faults in the logic resources of reprogrammableField Programmable Gate Arrays (FPGAs). Theapproach utilizes the programmability of the ConfigurableLogic Blocks (CLBs) to achieve 100% coverage of IDDQ-testablebridging faults. Since reconfiguration programmingtime can dominate total test time, even with slow IDDQ vectors,we use a bottom-up test generation approach to minimizethe number of programming phases first, and then tominimize the number of test vectors. 100% coverage forIDDQ-testable bridging faults is achieved in 5 programmingphases and 16 IDDQ vectors in the Xilinx XC4000 FPGAfamily. The RAM modes are tested in a further phase, using48 test vectors and 38 IDDQ measurements.