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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
IEICE TRANSACTIONS on Electronics
Publication Date: 2002/02/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Performance and Low-Power Microprocessors)
Category: Low-Power Technologies
low power, real-time embedded system, dynamic voltage scaling, application slicing, MPEG4,
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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.