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A Controller LSI for Realizing VDD-Hopping Scheme with Off-the-Shelf Processors and Its Application to MPEG4 System

Hiroshi KAWAGUCHI, Gang ZHANG, Seongsoo LEE, Youngsoo SHIN, Takayasu SAKURAI

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Summary :

An LSI has been fabricated and measured to demonstrate feasibility of VDD-hopping scheme in an embedded system level by executing MPEG4 CODEC. In the VDD-hopping, supply voltage of a processor is dynamically controlled by a hardware-software cooperative mechanism depending on workload of the processor. When the workload is about a half, the VDD-hopping is shown to reduce power to less than a quarter compared to the conventional fixed-VDD scheme. The power saving is achieved without degrading real-time features of MPEG4 CODEC.

Publication
IEICE TRANSACTIONS on Electronics Vol.E85-C No.2 pp.263-271
Publication Date
2002/02/01
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Issue on High-Performance and Low-Power Microprocessors)
Category
Low-Power Technologies

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