Desktop Board Features
23
Hardware Support
Power Connectors
ATX12V-compliant power supplies can turn off the computer power through system
control. When an ACPI-enabled computer receives the correct command, the power
supply removes all non-standby voltages.
When resuming from an AC power failure, the computer returns to the power state it
was in before power was interrupted (either on or off). The computer’s response can
be set by using the Last Power State feature in the BIOS Setup program’s Boot menu.
The Desktop Board has two power connectors. See Figure 25 on page 53 for the
location of the power co
nnectors.
Fan Headers
The function/operation of the fans is as follows:
• The fans are on when the board is in the ACPI S0 or S1 state.
• The fans are off when the computer is in the ACPI S3, S4, or S5 state.
• Each fan header is wired to a tachometer input.
• All fan headers support closed-loop fan control that can adjust the fan speed or
switch the fan on or off as needed.
• All fan headers have a +12 V DC connection (up to 12 V DC when using 3-wire
chassis fans).
• All fan headers are controlled by Pulse Width Modulation.
• The chassis fan header supports linear fan control on 3-wire fans.
The Desktop Board has a 4-pin processor fan header and two 4-pin chassis fan
headers compatible with 4-wire and 3-wire chassis fans.
LAN Wake Capabilities
CAUTION
For LAN wake capabilities, the 5 V standby line for the power supply must be capable
of delivering adequate +5 V standby current. Failure to provide adequate standby
current when using this feature can damage the power supply.
LAN wakeup capabilities enable remote wake-up of the computer through a network.
The LAN subsystem monitors network traffic and upon detecting a Magic Packet*
frame, it asserts a wake-up signal that powers up the computer.
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