Speculative Completion for the Design of High-Performance Asynchronous Dynamic Adders

  • Authors:
  • Steven M. Nowick;Kenneth Y. Yun;Ayoob E. Dooply;Peter A. Beerel

  • Affiliations:
  • -;-;-;-

  • Venue:
  • ASYNC '97 Proceedings of the 3rd International Symposium on Advanced Research in Asynchronous Circuits and Systems
  • Year:
  • 1997

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Abstract

This paper presents an in-depth case study in high-performance asynchronous adder design. A recent method, called "speculative completion", is used. This method uses single-rail bundled datapaths but also allows early completion. Five new dynamic designs are presented for Brent-Kung and Carry-Bypass adders. Furthermore, two new architectures are introduced, which target (i) small number addition, and (ii) hybrid operation. Initial SPICE simulation and statistical analysis show performance improvements up to 19% on random inputs and 14% on actual programs for 32-bit adders, and up to 29% on random inputs for 64-bit adders, over comparable synchronous designs.