Critical Path Identification and Delay Tests of Dynamic Circuits

  • Authors:
  • Kyung Tek Lee;Jacob A. Abraham

  • Affiliations:
  • -;-

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

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Abstract

Dynamic circuit families are commonly used toachieve high operating speeds in recent microprocessordesigns. Because of their noise sensitivity, it is necessary to design dynamic circuits accurately to achieveperformance goals and avoid problems with noise. Although individual cells can be analyzed effectively, timing verification of the entire design is not easy becauseof the increased complexity. In this paper, we developa new approach to find critical paths and generate testvectors for delay test of large dynamic circuits, giveninformation on the path delays of the unit cells. Weintroduce the concept of "path gates" to represent thedischarge paths in a dynamic circuit, and have developed an extraction tool (PEAR) to construct the pathgates. The critical path analyzer (CRITIC) is used toidentify the critical paths and generate delay tests forthe integrated units. The technique has been successfully applied to industry circuits.