Building the Power-Efficient PC: A Developer's Guide to ACPI Power Management
This book provides developers and integrators with practical knowledge and design techniques for building PCs that address the increasing demand for energy conservation.
TABLE OF CONTENTS Building the Power-Efficient PC: A Developer's Guide to ACPI Power Management
D-E
- D0 Device State Fully-On
- This state is assumed to be the highest level of power consumption. The device is completely active and responsive, and is expected to remember all relevant contexts continuously.
- D1 Device State
- Each device class defines the meaning of the D1 Device State. Many device classes may not define D1. In general, D1 is expected to save less power and preserve more device context than D2.
- D2 Device State
- Each device class defines the meaning of the D2 Device State. Many device classes may not define D2. In general, D2 is expected to save more power and preserve less device context than D1 or D0. Buses in D2 may cause the device to lose some context (for example, by reducing power on the bus, thus forcing the device to turn off some of its functions).
- D3 Device State Off
- In the D3 device state, power has been fully removed from the device. The device context is lost when this state is entered, so the OS software will reinitialize the device when powering it back on. Since device context and power are lost, devices in this state do not decode their address lines. Devices in this state have the longest restore times. All classes of devices define this state.
- Daemon
- A daemon is a computer process or program that remains dormant in the background until explicitly invoked.
- Double Data Rate (DDR) (also DDR-SDRAM or SDRAM II)
- DDR memory is a type of main system memory...
Copyright Intel Corporation 2001 under license agreement with Books24x7
