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Xtream-fit: an energy-delay efficient data memory subsystem for embedded media processing

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2 Author(s)
Ramachandran, A. ; Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA ; Jacome, M.F.

Due to the critical role played by data memory subsystems in the performance and energy efficiency of embedded systems, the design of energy-efficient data memory architectures has received considerable attention in recent years. In this paper, we propose a novel special-purpose data memory subsystem called Xtream-Fit which is aimed at achieving high energy-delay efficiency for streaming media applications. A key novelty of Xtream-Fit is that it exposes a single customization parameter, thus enabling a very simple and yet effective design space exploration methodology. A second key contribution of this paper is the ability to achieve very high energy-delay efficiency through a synergistic combination of: 1) special purpose memory subsystem components, namely, a streaming memory and a scratch-pad memory and (2) a novel task-based execution model that exposes/enhances opportunities for efficient prefetching, and aggressive dynamic energy conservation techniques targeting on-chip and off-chip memory components. Extensive experimental results show that Xtream-Fit reduces the energy-delay product by 22% to 61%, as compared to general-purpose memory subsystems enhanced with state of the art cache decay and SDRAM power-mode control policies.

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:24 ,  Issue: 6 )