低功耗系统设计
Li Xi Computer Applications Lab CS Department, USTC
Outline
The Effects of Power Low Power Design Methodologies
– Low power design techniques
DPM based low power optimization DVS based low power optimization
– Power estimation
Algorithm-level energy model and static analysis Program-level optimization for multimedia
– Power Analysis Tools – Case Study——WSN
Conclusion
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Innovation trend in future applications
Figure of Merit =
( Intelligence) ( size) (cost ) ( power )
New processors will provide higher MIPS/Watt. Market from PC to Digital Consumer, low-power is more critical!
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Power Constraint:heat dissipation limited systems
High-end systems, e.g. servers, stations and desktops Cooling and packaging cost Reliability requires
relative MTBF
1 0.8 0.6 0.4 0.2 0 70 75 80 85 90 95 100 105
source: Intel Components Quality and Reliability Handbook llxx@ustc.edu.cn
every 10℃ increase on operating temperature double failure rate for the components
Temp
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Energy Constraint:mobile and portable systems
Energy is a critical non-functional constraint in battery-powered systems – e.g. laptop, cell phone and PDA
16x
(M Pr oc
14x Improvement (compared to year 0) 12x 10x 8x 6x 4x 2x 1x 0 1 2
Ha rd
mo Me ry
J. Rabaey, BWRC
Battery (energy stored)
3 4 Time (years)
5
Di sk
) i ty ac p (ca
llxx@ustc.edu.cn
(c ap ac i ty )
es so r
IP S

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