Intel BLKD946GZABL Datasheet download pdf (Page 33)

Product Description

1.10.1.1 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 7 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 7. 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:

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

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

1.10.1.2 Two-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 1.5 W (or less) in S5 (Standby) mode. Two-Watt operation applies only

to the S5 state when the computer is turned off, but still connected to AC power.

Two-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.

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