Low Power BIST Design by Hypergraph Partitioning: Methodology and Architectures

  • Authors:
  • P. Girard;L. Guiller;C. Landrault;S. Pravossoudovitch

  • Affiliations:
  • -;-;-;-

  • Venue:
  • ITC '00 Proceedings of the 2000 IEEE International Test Conference
  • Year:
  • 2000

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Abstract

Power consumption of digital systems may increasesignificantly during testing. In this paper, we propose anovel low power/energy Built-In Self Test (BIST) strategybased on circuit partitioning. The strategy consists inpartitioning the original circuit into structural subcircuitsso that each subcircuit can be successively tested throughdifferent BIST sessions. In partitioning the circuit andplanning the test session, the switching activity in a timeinterval (i.e. the average power) as well as the peak powerconsumption are minimized. Moreover, the total energyconsumption during BIST is also reduced since the testlength required to test the subcircuits is not so far from thetest length for the original circuit. The proposed strategycan be applied to either test-per-scan or test-per-clockBIST schemes by slightly modifying conventional TPGstructures as illustrated in this paper. Results on ISCAScircuits show that average power reduction of up to 62%,peak power reduction of up to 57%, and energy reductionof up to 82% can be achieved at a very low area cost interms of area overhead and with almost no penalty on thecircuit timing.