User`s manual

Chapter 4: AMI BIOS

4-19

Voltage Readings

The following voltage readings will be displayed.

CPU1 Vcore, CPU2 Vcore, VTT CPU1, VTT CPU2, CPU1 DDR3, CPU2 DDR3,

1.5V, 1.8V, 5V, 12V, 3.3V, 3.3VSB, VBAT and PIV1_IOH

ACPI Conﬁ guration

Use this feature to conﬁ gure Advanced Conﬁ guration and Power Interface (ACPI)

power management settings for your system.

High Performance Event Timer

Select Enabled to activate the High Performance Event Timer (HPET) that produces

periodic interrupts at a much higher frequency than a Real-time Clock (RTC) does in

synchronizing multimedia streams, providing smooth playback and reducing the de-

pendency on other timestamp calculation devices, such as an x86 RDTSC Instruc-

tion embedded in the CPU. The High Performance Event Timer is used to replace

the 8254 Programmable Interval Timer. The options are Enabled and Disabled.

USB Device Wakeup

Select Enable to "wake-up" the system via a USB device when the system is in

S3 or S4 State. The options are Enabled and Disabled.

ACPI Aware O/S

Enable ACPI support if it is supported by the OS to control ACPI through the Operat-

ing System. Otherwise, disable this feature. The options are Yes and No.

Suspend Mode

This option is used to select the ACPI State that is used for system suspend. The

options are S1 (POS), S3 (STR) and Auto.

S1 (POS) - The caches in a processor are erased, and the processor stops ex-

ecuting instructions. Power to the processor and RAM is maintained, and RAM

is refreshed.

S3 (STR) - The processor has no power, and the power supply goes on reduced

power mode. However, main memory (RAM) is still active.

ACPI APIC Support

Select Enabled to include the ACPI APIC Table Pointer in the RSDT (Root System

Description Table) pointer list. The options are Enabled and Disabled.

APIC ACPI SCI IRQ

When this item is set to Enabled, APIC ACPI SCI IRQ is supported by the system.

The options are Enabled and Disabled.