Intel D845PEBT2 Product Specification - Page 39

System States and Power States

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Product Description 1.16.1.1 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 Desktop Board D845PEBT2 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 G1 - sleeping state G1 - sleeping state G1 - sleeping state G2/G5 G3 - mechanical off AC power is disconnected from the computer. S0 - working S1 - Processor stopped S3 - Suspend to RAM. Context saved to RAM. S4 - Suspend to disk. Context saved to disk. S5 - Soft off. Context not saved. Cold boot is required. No power to the system. C0 - working C1 - stop grant No power No power No power D0 - working state. D1, D2, D3 - device specification specific. D3 - no power except for wake-up logic. D3 - no power except for wake-up logic. D3 - no power except for wake-up logic. Full power > 30 W 5 W < power < 52.5 W Power < 5 W (Note 2) Power < 5 W (Note 2) Power < 5 W (Note 2) 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 powered by the system chassis' power supply. 2. Dependent on the standby power consumption of wake-up devices used in the system. 39

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Product Description
39
1.16.1.1
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 Desktop Board D845PEBT2 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/G5
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 powered
by the system chassis
’
power supply.
2.
Dependent on the standby power consumption of wake-up devices used in the system.