The difference-bit cache

  • Authors:
  • Toni Juan;Tomás Lang;Juan J. Navarro

  • Affiliations:
  • Department of Computer Architecture, Universitat Politècnica de Catalunya, Gran Capità s/n, Modul D6, E-08034 Barcelona, Spain;Department of Electrical and Computer Engineering, University of California at Irvine;Department of Computer Architecture, Universitat Politècnica de Catalunya, Gran Capità s/n, Modul D6, E-08034 Barcelona, Spain

  • Venue:
  • ISCA '96 Proceedings of the 23rd annual international symposium on Computer architecture
  • Year:
  • 1996

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Abstract

The difference-bit cache is a two-way set-associative cache with an access time that is smaller than that of a conventional one and close or equal to that of a direct-mapped cache. This is achieved by noticing that the two tags for a set have to differ at least by one bit and by using this bit to select the way. In contrast with previous approaches that predict the way and have two types of hits (primary of one cycle and secondary of two to four cycles), all hits of the difference-bit cache are of one cycle. The evaluation of the access time of our cache organization has been performed using a recently proposed on-chip cache access model.