Intel SE7221BA1 Product Specification - Page 27

System States and Power States - e processor support

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Intel® Entry Server Board SE7221BA1-E TPS Functional Architecture The following table lists the system states based on how long the power switch is pressed, depending on how ACPI is configured with an ACPI-aware operating system. Table 2. Power Switch Options If the system is in this state... Off (ACPI G2/G5 - Soft off) On (ACPI G0 - working state) On (ACPI G0 - working state) Sleep (ACPI G1 - sleeping state) Sleep (ACPI G1 - sleeping state) ...and the power switch is pressed for Less than four seconds Less than four seconds More than four seconds Less than four seconds More than four seconds ...the system enters this state Power-on (ACPI G0 - working state) Soft-off/Standby (ACPI G1 - sleeping state) Fail safe power-off (ACPI G2/G5 - Soft off) Wake-up (ACPI G0 - working state) Power-off (ACPI G2/G5 - Soft off) Note: These functions are yet to be determined and validated 3.6.2 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. The following table lists the power states supported by Intel® Entry Server Board SE7221BA1-E along with the associated system power targets. See the ACPI Specification for a complete description of the various system and power states. Table 3. Power States and Targeted System Power Global States G0 - working state G1 - sleeping state G1 - sleeping state G2/S5 G3 - mechanical off AC power is disconnected from the computer. Notes: Sleeping States S0 - working Processor States C0 - working Device States D0 - working state. Targeted System Power (Note 1) Full power > 30 W S1 - Processor stopped S4 - Suspend to disk. Context saved to disk. S5 - Soft off. Context not saved. Cold boot is required. No power to the system. C1 - stop grant No power No power No power 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 for wake-up logic, except when provided by battery or external source. 5 W < power < 52.5 W Power < 5 W (Note 2) Power < 5 W (Note 2) No power to the system. Service can be performed safely. Revision 1.5 17

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Intel® Entry Server Board SE7221BA1-E TPS
Functional Architecture
Revision 1.5
17
The following table lists the system states based on how long the power switch is pressed,
depending on how ACPI is configured with an ACPI-aware operating system.
Table 2.
Power Switch Options
If the system is in this state…
…and the power switch is
pressed for
…the system enters this state
Off
(ACPI G2/G5 – Soft off)
Less than four seconds
Power-on
(ACPI G0 – working state)
On
(ACPI G0 – working state)
Less than four seconds
Soft-off/Standby
(ACPI G1 – sleeping state)
On
(ACPI G0 – working state)
More than four seconds
Fail safe power-off
(ACPI G2/G5 – Soft off)
Sleep
(ACPI G1 – sleeping state)
Less than four seconds
Wake-up
(ACPI G0 – working state)
Sleep
(ACPI G1 – sleeping state)
More than four seconds
Power-off
(ACPI G2/G5 – Soft off)
Note: These functions are yet to be determined and validated
3.6.2
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.
The following table lists the power states supported by Intel® Entry Server Board SE7221BA1-E
along with the associated system power targets.
See the
ACPI Specification
for a complete
description of the various system and power states.
Table 3.
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
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: