Preliminary Evaluation of Flex Power FPGA: A Power Reconfigurable Architecture with Fine Granularity

Takashi KAWANAMI  Masakazu HIOKI  Hiroshi NAGASE  Toshiyuki TSUTSUMI  Tadashi NAKAGAWA  Toshihiro SEKIGAWA  Hanpei KOIKE  

IEICE TRANSACTIONS on Information and Systems   Vol.E87-D    No.8    pp.2004-2010
Publication Date: 2004/08/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Reconfigurable Systems)
Category: Recornfigurable Systems
FPGA,  reconfigurable device,  low-power,  threshold voltage control,  EDA,  

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The Flex Power FPGA is presented as a novel FPGA model offering the ability to configure the trade-off between power consumption and speed for each logic element by adjusting the threshold voltage. This FPGA model targets the reduction of static power consumption, which has become one of the most important issues in the development of future-generation devices. The present paper describes a preliminary simulation study of the Flex Power FPGA. A method to effectively assign threshold voltages to transistors at a prescribed granularity based on a timing analysis of the mapped circuit is implemented using the VPR simulator, and the static power reduction for 70 nm technologies is estimated using MCNC benchmark circuits. Simulation results show that the average static power can be reduced to as little as 1/30 of that in the corresponding conventional FPGA. This FPGA model is also demonstrated to be effective with future technologies, where the proportion of static power will be greater.

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