Abit BE7-G User Manual page 62

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The S3 (STR) State (STR means Suspend to RAM):
The S3 state is logically lower then the S2 state and is assumed to conserve more power. The behavior of
this state is defined as follows:
•
Processor is not executing instructions. The processor complex context is not maintained.
•
Dynamic RAM context is maintained.
•
Power Resources are in a state compatible with the system S3 state. All Power Resources that
supply a System Level reference of S0, S1, or S2 are in the OFF state.
•
Devices states are compatible with the current Power Resource states. Only devices which solely
reference Power Resources which are in the ON state for a given device state can be in that device
state. In all other cases, the device is in the D3 (off) state.
•
Devices that are enabled to wake the system and that can do so from their current device state can
initiate a hardware event which transitions the system state to S0. This transition causes the
processor to begin execution at its boot location. The BIOS performs initialization of core functions
as required to exit an S3 state and passes control to the firmware resume vector. Please see the
ACPI Specification Rev. 1.0 book section 9.3.2 for more details on BIOS initialization.
From the software point of view, this state is functionally the same as the S2 state. The operational
difference can be that some Power Resources that could be left ON in the S2 state might not be available
to the S3 state. As such, additional devices can be required to be in logically lower D0, D1, D2, or D3
state for S3 than S2. Similarly, some device wake events can function in S2 but not S3.
Because the processor context can be lost while in the S3 state, the transition to the S3 state requires that
the operating software flush all dirty cache to DRAM.
The information above for system S0 & S3 were referring to ACPI Specification.
Resume by USB From S3:
Two options are available: Enabled and Disabled. The default setting is Disabled.
Power Button Function:
Two options are available: Instant-off and Delay 4 Sec.. The default setting is Instant-off. Pressing the
power button for more than four seconds forces the system to enter the Soft-Off state when the system has
"hung".
CPU THRM-Throttling
This option is used during Suspend To RAM (STR) mode. It controls the CPU speed as a percentage of
regular power. The options include 87.5%, 75.0%, 62.5%, 50.0%, 37.5%, 25.0%, and 12.5%. The default
setting is set at 62.5%.
WakeUp by PME# of PCI:
Two options are available: Enabled and Disabled. Default setting is Disabled. This item can let you
wake-up your computer by PCI devices. For instance, if you had installed a PCI LAN card with Wake-Up
on LAN capability, then you could wake-up your computer from another computer via a network by
sending a wake-up frame signal. This feature also allows the PCI card built-in hardware function to
support the wake up function without special cables connected to the motherboard.
BE7 Series
Chapter 3