Cool mega-array: A highly energy efficient reconfigurable accelerator

N. Ozaki, Y. Yoshihiro, Y. Saito, D. Ikebuchi, M. Kimura, H. Amano, H. Nakamura, K. Usami, M. Namiki, M. Kondo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)

Abstract

A highly energy efficient reconfigurable accelerator called CMA (Cool Mega-Array) is proposed. It consists of a large Processing Element (PE) array without memory elements for maintain result of ALU and configuration data, a small simple programmable micro controller for data management, and the data memory. Unlike traditional coarse grained reconfigurable processors, the power consumption for hardware context switching, storing intermediate data in registers, and clock distribution for them are eliminated from PE array which occupies large area of a chip. Configuration registers are collected to small area of micro controller. The data flow graph mapped on the PE array is static during execution. Various application programs can be implemented by making the best use of flexible data management instructions with the micro controller. When the delay time in the PE array is longer than the data handling time with the micro controller, the supply voltage for the PE array is scaled to reduce the power consumption without degrading the performance. In the opposite case, wave pipelining is applied to enhance PE array performance. A prototype chip CMA-1 with 8 × 8 PE array with 24-bit data width was fabricated in 2.1 × 4.2mm 2 65-nm CMOS technology, and achieves 2.4-GOPS/11.2-mW sustained performance. This energy efficiency is comparable to that of the most energy efficient accelerators that have been reported.

Original languageEnglish
Title of host publication2011 International Conference on Field-Programmable Technology, FPT 2011
DOIs
Publication statusPublished - 2011 Dec 1
Event2011 International Conference on Field-Programmable Technology, FPT 2011 - New Delhi, India
Duration: 2011 Dec 122011 Dec 14

Publication series

Name2011 International Conference on Field-Programmable Technology, FPT 2011

Conference

Conference2011 International Conference on Field-Programmable Technology, FPT 2011
CountryIndia
CityNew Delhi
Period11/12/1211/12/14

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ASJC Scopus subject areas

  • Computational Mathematics

Cite this

Ozaki, N., Yoshihiro, Y., Saito, Y., Ikebuchi, D., Kimura, M., Amano, H., Nakamura, H., Usami, K., Namiki, M., & Kondo, M. (2011). Cool mega-array: A highly energy efficient reconfigurable accelerator. In 2011 International Conference on Field-Programmable Technology, FPT 2011 [6132668] (2011 International Conference on Field-Programmable Technology, FPT 2011). https://doi.org/10.1109/FPT.2011.6132668