Theory of Operation—Mobile Intel® 915GME Express Chipset

Table 5 lists the power management states that have been identified for the Mobile Intel® 915GME Express Chipset Platform.

Table 5. Mobile Intel® 915GME Express Chipset Power Management States

State

Description

 

 

G0/S0/C0

Full On

 

 

G0/S0/C2

STPCLK# signal active

 

 

G0/S0/C3

Deep Sleep: DPSLP# signal active

 

 

G0/S0/C4

Deeper Sleep: DPRSLP# signal active

 

 

G1/S3_HOT

Suspend to RAM (all S3 rails are turned on except processor power rails)

 

 

G1/S3_COLD

Suspend to RAM (all S3 rails are turned off)

 

 

G1/S4

Suspend to Disk

 

 

G2/S5

Soft Off

 

 

G3

Mechanical Off

 

 

3.6.1Transition to S1 or S3

If enabled, the transition to S1 or S3 from the full-on state can be accomplished in the following ways:

The OS performs the transition through software.

Press the front panel power button for less than four seconds (assuming the OS power management support has been enabled).

3.6.2Transition to S4

“Wake on S4” (Suspend to disk) is controlled by the operating system.

3.6.3Transition to S5

The transition to S5 is accomplished by the following means:

Press the front panel power button for less than four seconds (if enabled through the OS).

Press the front panel power button for more than four seconds to activate power button override.

3.6.4Transition to Full-On

The transition to the Full-On state can be from S1, S3, or S5. The transition from S1 or

S3 is a low latency transition that is triggered by one of the following wake events:

Power management timer expiration

Real Time Clock (RTC) triggered alarm

Power button activation

USB device interrupt

PME# assertion

Mouse/Keyboard movement (Applies only to S1 Transition)

AC power loss

 

Mobile Intel® 915GME Express Chipset

April 2007

Development Kit User’s Manual

Order Number: 317230-001US

29

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Image 29
Intel 915GME user manual Transition to S1 or S3, Transition to S4, Transition to S5, Transition to Full-On