A low power reconfigurable accelerator using a back-gate bias control technique

Hongliang Su, Weihan Wang, Kuniaki Kitamori, Hideharu Amano

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

3 Citations (Scopus)

Abstract

Leakage power is a serious problem especially for accerelators which use a large size Processing Element (PE) array. Here, a low power reconfigurable accelerator called Cool Mega Array (CMA) with back-gate bias control (CMA-bb) is implemented and evaluated. In CMA-bb, the back-gate bias of the microcontroller and PE array can be controlled independently. In the idle mode, reverse bias is given to the both parts to suppress the leakage current. When high performance is required, forward bias is used to increase the clock frequency. For simple applications, the operational power can be suppressed by using reverse bias only in the PE array. The real chip is implemented with a 65nm experimental process for low leakage applications. The evaluation results show that the leakage current can be suppressed to 300μA by using the reverse bias. The operational frequency is increased from 39MHz to 50MHz with up to 21% increase of operational power by using the forward bias. For simple applications, 8% to 9.4% of operational power is saved by giving reverse bias only to the PE array.

Original languageEnglish
Title of host publicationFPT 2013 - Proceedings of the 2013 International Conference on Field Programmable Technology
Pages390-393
Number of pages4
DOIs
Publication statusPublished - 2013 Dec 1
Event2013 12th International Conference on Field-Programmable Technology, FPT 2013 - Kyoto, Japan
Duration: 2013 Dec 92013 Dec 11

Publication series

NameFPT 2013 - Proceedings of the 2013 International Conference on Field Programmable Technology

Other

Other2013 12th International Conference on Field-Programmable Technology, FPT 2013
CountryJapan
CityKyoto
Period13/12/913/12/11

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Keywords

  • Back-Gate Bias Control
  • Corase Grained Reconfigurable Processor
  • Leakage Power Reduction

ASJC Scopus subject areas

  • Software

Cite this

Su, H., Wang, W., Kitamori, K., & Amano, H. (2013). A low power reconfigurable accelerator using a back-gate bias control technique. In FPT 2013 - Proceedings of the 2013 International Conference on Field Programmable Technology (pp. 390-393). [6718395] (FPT 2013 - Proceedings of the 2013 International Conference on Field Programmable Technology). https://doi.org/10.1109/FPT.2013.6718395