Delay variation tolerance for domino circuits

  • Authors:
  • Kai-Chiang Wu;Cheng-Tao Hsieh;Shih-Chieh Chang

  • Affiliations:
  • National Tsing Hua University, Hsinchu, Taiwan;National Tsing Hua University, Hsinchu, Taiwan;National Tsing Hua University, Hsinchu, Taiwan

  • Venue:
  • ASP-DAC '06 Proceedings of the 2006 Asia and South Pacific Design Automation Conference
  • Year:
  • 2006

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Abstract

Factors of delay variation, such as process variation and noise effects, may cause a manufactured chip to violate the pre-specified timing constraint. In this paper, we propose a novel re-synthesis technique to tolerate delay variation for domino circuits. Note that the slacks of nodes along critical paths are zero; any delay addition to those zero-slack nodes will worsen the final performance of a circuit. Our basic idea is to increase the slacks of nodes in the critical region by appending a redundant auxiliary sub-circuit to the original circuit. The auxiliary sub-circuit can cause critical paths to become false paths or imperceptible paths [7] so as to improve the capability of delay variation tolerance. Experimental results are very encouraging.