Intel D925XBC, D925XCV Instantly Available PC Technology, Resume on Ring, Wake from USB

Product Description

Depending on the LAN implementation, the Desktop Boards D925XCV and D925XBC support LAN wake capabilities with ACPI in the following ways:

•The PCI Express WAKE# signal

•The PCI Conventional bus PME# signal for PCI 2.2 compliant LAN designs

•The onboard LAN subsystem

1.14.2.4Instantly 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 Desktop Boards D925XCV and D925XBC 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 10 on page 43 lists the devices and events that can wake the computer from the S3 state.

The Desktop Boards D925XCV and D925XBC support 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.

1.14.2.5Resume on Ring

The operation of Resume on Ring can be summarized as follows:

•Resumes operation from ACPI S1 or S3 states

•Detects incoming call similarly for external and internal modems

•Requires modem interrupt be unmasked for correct operation

1.14.2.6Wake 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.

1.14.2.7Wake from PS/2 Devices

PS/2 device activity wakes the computer from an ACPI S1 or S3 state.

1.14.2.8PME# Signal Wake-up Support

When the PME# signal on the PCI Conventional bus is asserted, the computer wakes from an ACPI S1, S3, S4, or S5 state (with Wake on PME enabled in BIOS).

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