Intel DC3217IYE Technical Product Specification - Page 30
Power Management - usb driver
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Intel Desktop Board D33217GKE Technical Product Specification 1.11 Power Management Power management is implemented at several levels, including: • Software support through Advanced Configuration and Power Interface (ACPI) • Hardware support: Power Input Instantly Available PC technology LAN wake capabilities Wake from USB WAKE# signal wake-up support Wake from S5 +5 V Standby Power Indicator LED 1.11.1 ACPI ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with this board requires an operating system that provides full ACPI support. ACPI features include: • Plug and Play (including bus and device enumeration) • Power management control of individual devices, add-in boards (some add-in boards may require an ACPI-aware driver), video displays, and hard disk drives • Methods for achieving less than 15-watt system operation in the power-on/standby sleeping state • A Soft-off feature that enables the operating system to power-off the computer • Support for multiple wake-up events (see Table 9 on page 32) • Support for a front panel power and sleep mode switch Table 7 lists the system states based on how long the power switch is pressed, depending on how ACPI is configured with an ACPI-aware operating system. Table 7. Effects of Pressing the Power Switch If the system is in this ...and the power switch is state... pressed for ...the system enters this state Off (ACPI G2/G5 - Soft off) Less than four seconds Power-on (ACPI G0 - working state) On (ACPI G0 - working state) Less than four seconds Soft-off/Standby (ACPI G1 - sleeping state) Note On (ACPI G0 - working state) More than six seconds Fail safe power-off (ACPI G2/G5 - Soft off) Sleep (ACPI G1 - sleeping state) Less than four seconds Wake-up (ACPI G0 - working state) Sleep (ACPI G1 - sleeping state) More than six seconds Power-off (ACPI G2/G5 - Soft off) Note: Depending on power management settings in the operating system. 30