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SAI2 Server Board Architecture Overview
2.7
ACPI
The Advance Configuration and Power Interface (ACPI)-aware operating system can place the
system into a state where the hard drives spin down, the system fans stop, and all processing is
halted. In this state the power supply is still on and the processors still dissipate some power,
such that the power supply fan and processor fans are still running.
Note: ACPI requires an operating system that supports this feature.
The ACPI sleep states discussed below are defined as:
s0: Normal running state.
s1: Processor sleep state. No content is lost in this state and the processor caches
maintain coherency.
s4: Hibernate or Save to Disk. The memory and machine state are saved to disk.
Pressing the power button or another wakeup event restores the system state from the
disk and resumes normal operation. This assumes that no hardware changes were
made to the system while it was off.
s5: Soft off. Only the RTC section of the chip set is running in this state.
The SAI2 server board supports sleep states s0, s1, s4, and s5. When the server board is
operating in ACPI mode, the operating system retains control of the system and the OS policy
determines the entry methods and wake up sources for each sleep state – sleep entry and
wake up event capabilities are provided by the hardware but are enabled by the OS.
With future versions of Microsoft* Windows* 9X that support ACPI, the system BIOS supports
only sleep states s0, s1 and s5.
2.8
AC Link Mode
The AC link mode allows the system to monitor its AC input power so that if AC input power is
lost and then restored, the system returns to one of the following pre-selected settings:
Power On
Last State (Factory Default Setting)
Stay Off
The AC link mode settings can be changed by running the BIOS Setup Utility.
2.9
Wake On LAN Function
The remote power-on function turns on the system power through a network or modem. If the
system power is set to Off, it can be turned on remotely by sending a specific packet from the
main computer to the remote system.
Note: The standard default value of the remote power-on function is "Disabled". The Wake-on-
LAN / Ring function can changed by setting the option to "Enabled" in the BIOS Setup Utility.
18
SAI2 Server Board TPS
Revision 1.0
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