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Power consumption has become one of the primary design constraints for all types of microprocessor. We have been developing techniques that combine new circuit designs and microarchitectural algorithms to reduce both switching and leakage power in components that dominate energy consumption, including flip-flops, caches, datapaths, and register files. Flip-flops and latches along with the clock networks used to drive them consume a significant fraction of total power in any synchronous digital system. We have developed activity-sensitive selection of flip-flops and latches, which uses local signal activity to determine the lowest energy structure to use at each point in a circuit [ 10 ].
Saving energy in Linux (power management of hard drive, monitor, and CPU using ACPI or APM) Spencer Stirling Sections: Turn off your Monitor Spin down Hard Drives APM ACPI These notes will favor Debian, although they are probably useful to any distro. The first part of this has little to do with the APM or ACPI capabilities of your machine. Instead, I will first discuss how to turn off your monitor and spin down your hard drive. In these states the machine itself is still completely "alive" and crunching numbers. The power management features that control your CPU and motherboard, however, are governed by either the newer ACPI standard or the older APM standard.
Laptops give you the freedom to do whatever you want, wherever you want to do it. But when your battery runs out, the fun is over. Fortunately, there are a lot of ways to save power and make your battery last longer.
How High-Level Modeling Speeds Low Power Design Power analysis limitations at the higher level cause most people to handle power requirements post-place-and-route, or minimally, post-synthesis. The degrees of design freedom gained at the post-synthesis stage are quite modest compared with optimizing power in the context of the system early in the design phase.