Intel DZ77BH-55K, Specification, Page: 39 / 100

Product Description
39
1.11.2.4 Instantly Available PC Technology
CAUTION
For Instantly Available PC technology, the +5 V standby line for the power supply must
be capable of providing ad5 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 LED is amber if dual colored, or off if single
colored.) When signaled by a wake-up device or event, the system quickly returns to
its last known wake state. Table 12 on page 36 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.
1.11.2.5 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.
1.11.2.6 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 (with Wake on PME enabled in the BIOS).
1.11.2.7 WAKE# Signal Wake-up Support
When the WAKE# signal on the PCI Express bus is asserted, the computer wakes from
an ACPI S3, S4, or S5 state.
1.11.2.8 Wake from Consumer IR
CIR activity wakes the computer from an ACPI S3, S4, or S5 state.
1.11.2.9 Wake from S5
When the RTC Date and Time is set in the BIOS, the computer will automatically wake
from an ACPI S5 state.