D945GTP datasheet(39/92 Pages) INTEL

39 / 92 page

Product Description

1.12.1.1

System States and Power States

Under ACPI, the operating system directs all system and device power state transitions. The

operating system puts devices in and out of low-power states based on user preferences and

knowledge of how devices are being used by applications. Devices that are not being used can be

turned off. The operating system uses information from applications and user settings to put the

system as a whole into a low-power state.

Table 8 lists the power states supported by the board along with the associated system power

targets. See the ACPI specification for a complete description of the various system and power

states.

Table 8.

Power States and Targeted System Power

Global States

Sleeping States

Processor

States

Device States

Targeted System

Power (Note 1)

G0 – working

state

S0 – working

C0 – working

D0 – working state.

Full power > 30 W

G1 – sleeping

state

S1 – Processor

stopped

C1 – stop

grant

D1, D2, D3 – device

specification

specific.

5 W < power < 52.5 W

G1 – sleeping

state

S3 – Suspend to

RAM. Context

saved to RAM.

No power

D3 – no power

except for wake-up

logic.

Power < 5 W (Note 2)

G1 – sleeping

state

S4 – Suspend to

disk. Context

saved to disk.

No power

D3 – no power

except for wake-up

logic.

Power < 5 W (Note 2)

G2/S5

S5 – Soft off.

Context not saved.

Cold boot is

required.

No power

D3 – no power

except for wake-up

logic.

Power < 5 W (Note 2)

G3 –

mechanical off

AC power is

disconnected

from the

computer.

No power to the

system.

No power

D3 – no power for

wake-up logic,

except when

provided by battery

or external source.

No power to the system.

Service can be

performed safely.

Notes:

Total system power is dependent on the system configuration, including add-in boards and peripherals powered

by the system chassis’ power supply.

Dependent on the standby power consumption of wake-up devices used in the system.

1.12.1.2

One-Watt Standby

In 2001, the U.S. government issued an executive order requiring a reduction in power for

appliances and personal computers. This board meets that requirement by operating at 1 W (or

less) in S5 (Standby) mode. One-Watt operation applies only to the S5 state when the computer is

turned off, but still connected to AC power. One-Watt operation does not apply to the S3 (Suspend

to RAM) or S4 (Suspend to disk) states.

Newer energy-efficient power supplies using less than 0.5 W (in Standby mode) may also be

needed to achieve this goal.

D945GTP Datasheet(PDF) 39 Page - Intel Corporation

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