High performance set associative translation lookaside buffers for low power microprocessors

  • Authors:
  • Jonathan R. Haigh;Lawrence T. Clark

  • Affiliations:
  • Marvell Semiconductor, USA;Arizona State University, USA

  • Venue:
  • Integration, the VLSI Journal
  • Year:
  • 2008

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Abstract

A fast low power four-way set-associative translation lookaside buffer (TLB) is proposed. The proposed TLB allows single clock phase accesses at clock frequencies above 1GHz. Comparisons to a conventional fully associative CAM tagged TLB, which is the type most commonly used in embedded processors, with the same number of entries on a 65nm low standby power process show that the proposed design has 28% lower delay and up to 50% lower energy delay product. Unlike previous set-associative TLBs, which replicate the TLB to support multiple page sizes, multiple page sizes are supported on a way-by-way basis. Alternative conventional CAM tagged and set-associative TLBs are investigated with regard to access latency, power dissipation and hit rates.