Cache-Aware Scratchpad Allocation Algorithm

  • Authors:
  • Manish Verma;Lars Wehmeyer;Peter Marwedel

  • Affiliations:
  • -;-;-

  • Venue:
  • Proceedings of the conference on Design, automation and test in Europe - Volume 2
  • Year:
  • 2004

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Abstract

In the context of portable embedded systems, reducing energy is one of the prime objectives. Most high-end embedded microprocessors include onchip instruction and data caches, along with a small energy ef.cient scratchpad. Previous approaches for utilizing scratchpad did not consider caches and hence fail for the au courant architecture. In thepresented work, we use the scratchpad for storing instructions and propose a generic Cache Aware Scratchpad Allocation (CASA) algorithm. We report an average reduction of 8-29% in instruction memory energy consumption compared to a previously published technique for benchmarks from the Mediabench suite.The scratchpad in the presented architecture is similar to a preloaded loop cache. Comparing the energy consumption of our approach against preloaded loop caches, we reportaverage energy savings of 20-44%.