Product Description
33
1.15.2.4 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 7 on page 30 lists the
devices and events that can wake the computer from the S3 state.
The board supports the PC
I 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 2.3 compliant add-in cards, PCI Express add-in cards, and drivers.
1.15.2.5 Wake from USB
USB bus activity wakes the computer from ACPI S1 or S3 states.
NOTE
Wake from USB requires the use of a USB peripheral that supports Wake from USB
and is supported by the operating system.
1.15.2.6 PME# Signal Wake-up Support
When the PME# signal on the Conventional PCI bus is asserted, the computer wakes
from an ACPI S1, S3, S4, or S5 state.
1.15.2.7 WAKE# Signal Wake-up Support
When the WAKE# signal on a PCI Express add-in card is asserted, the computer wakes
from an ACPI S1, S3, S4, or S5 state.
1.15.2.8 Wake from PS/2 Devices
PS/2 device activity can wake the computer from an ACPI S1, S3, S4, or S5 state.
When the computer is in an S4 state, any key can be used to wake the computer
provided a supported operating system is installed. When the computer is in the S5
state, the only PS/2 activity that will wake the computer is either the Alt-PrtScrn key
combination or the “Power” key that is available on some keyboards. The BIOS can be
used to select between either of the key combinations.
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