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Product Description

1.16.2.4 Instantly Available PC Technology

CAUTION

For Instantly Available PC technology, the +5 V standby line for the power supply must

be capable of providing adequate +5 V standby current. Failure to provide adequate

standby current when implementing Instantly Available PC technology can damage the

power supply.

Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to-

RAM) sleep-state. While in the S3 sleep-state, the computer will appear to be off (the

power supply is off and the front panel power LED will behave as configured by the

BIOS “S3 State Indicator” option). When signaled by a wake-up device or event, the

system quickly returns to its last known wake state. Table 8 on page 32 lists the

devices and events that can wake the computer from the S3 state.

The board supports the PCI Bus Power Management Interface Specification. Add-in

boards that also support this specification can participate in power management and

can be used to wake the computer.

The use of Instantly Available PC technology requires operating system support and

PCI 2.2 compliant add-in cards, PCI Express add-in cards, and drivers.

1.16.2.5 Wake from USB

USB bus activity wakes the computer from an ACPI S3 state.

NOTE

Wake from USB requires the use of a USB peripheral that supports Wake from USB

and is supported by the operating system.

1.16.2.6 PME# Signal Wake-up Support

When the PME# signal on the Conventional PCI bus is asserted, the computer wakes

from an ACPI S3, S4, or S5 state.

1.16.2.7 WAKE# Signal Wake-up Support

When the WAKE# signal on a PCI Express add-in card is asserted, the computer wakes

from an ACPI S3, S4, or S5 state.

1.16.2.8 Wake from Serial Port

Serial port activity wakes the computer from an ACPI S3 state.

1.16.2.9 Wake from PS/2 Devices

PS/2 device activity wakes the computer from an ACPI S3, S4, or S5 state. However,

when the computer is in an S4 or S5 state, the only PS/2 activity that will wake the

computer is the alt-PrtScrn key combination on the keyboard.

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