Intel 915GME Transition to S1 or S3, Transition to S4, Transition to S5, Transition to Full-On

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