RG82845G S L66F Intel, RG82845G S L66F Datasheet - Page 136
RG82845G S L66F
Manufacturer Part Number
RG82845G S L66F
Description
Manufacturer
Intel
Datasheet
1.RG82845G_S_L66F.pdf
(193 pages)
Specifications of RG82845G S L66F
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Functional Description
4.6
4.6.1
4.6.2
4.6.3
4.6.4
136
Power and Thermal Management
Power Management Support Overview
Processor Power State Control
Sleep State Control
Graphics Adapter State Control
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ACPI Supported
System States: S0, S1(desktop), S3, S4, S5, C0, C1, C2 (desktop)
Graphics States: D0, D3
Monitor States: D0, D1, D2, D3
C0 (Full On): This is the only state that runs software. All clocks are running, STPCLK# is
deasserted and the processor core is active. The processor can service snoops and maintain
cache coherency in this state.
C1 (Auto-Halt): The first level of power reduction occurs when the processor executes an
Auto-Halt instruction. This stops the execution of the instruction stream. The processor can
service snoops and maintain cache coherency in this state.
C2 (Stop Grant): The next level of power reduction occurs when the processor is placed into
the Stop Grant state by the assertion of STPCLK#. The GMCH supports only the Stop Grant
state in C2.
S0 (Awake): In this state all power planes are active.
S1 (Stop Grant): S1 state is the same as C2 state (Stop Grant).
S3 (Suspend-To-RAM): The next level of power reduction occurs when the clock synthesizer
and main power planes (ICH4, GMCH, and the processor) are shut down but the DRAM
memory plane and the ICH4 resume well remain active. This is the Suspend-To-RAM (STR)
state. All clocks from the synthesizer are shut down during the S3 state.
S4 (Suspend-To-Disk) and S5 (Soft Off): The next level of power reduction occurs when the
memory power is shut down in addition to the clock synthesizer, ICH4, GMCH, and the
processor power planes. The ICH4 resume well is still powered.
G3 (Mechanical Off): In this state only the RTC well is powered. The system can only
reactivate when the power switch is returned to the “on” position.
D0 (Active): In this state, power planes are normal and active. This is the normal on state for
the GMCH graphics functions. The GMCH graphics functions enter this state out of power-on-
reset.
D3 (Inactive): The D3 power state is the lowest power mode. Displays are off, and the
registers and memory need not be maintained. HSYNC and VSYNC are not pulsed in this
state.
Intel
®
82845G/82845GL/82845GV GMCH Datasheet
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