On Statistical Timing Analysis with Inter- and Intra-Die Variations

  • Authors:
  • Hratch Mangassarian;Mohab Anis

  • Affiliations:
  • University of Waterloo, Canada;University of Waterloo, Canada

  • Venue:
  • Proceedings of the conference on Design, Automation and Test in Europe - Volume 1
  • Year:
  • 2005

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Abstract

In this paper, we highlight a fast, effective and practical statistical approach that deals with inter and intra-die variations in VLSI chips. Our methodology is applied to a number of random variables while accounting for spatial correlations. Our methodology sorts the Probability Density Functions (PDFs) of the critical paths of a circuit based on a confidence-point. We show the mathematical accuracy of our method as well as implement a typical program to test it on various benchmarks. We find that worst-case analysis overestimates path delays by more than 50% and that a path's probabilistic rank with respect to delay is very different from its deterministic rank.