RG82845M Intel, RG82845M Datasheet - Page 123

• Manufacturer Part Number: RG82845M
• Description: Chipset Memory Controller Hub Mobile
• Manufacturer: Intel

5.4.1.
5.4.2.
250687-002
Table 32. Power Management State Combinations
R
Various States
General Description of Supported CPU States
Global (G)
• C0 (Full On): This is the only state that runs software. All clocks are running, STPCLK# is
• C1 (Auto Halt): The first level of power reduction occurs when the processor executes an Auto-
• C2 (Stop Grant): To enter this low power state, STPCLK# is asserted. The processor can still
• C3 (Sleep or Deep Sleep): In these states the processor clock is stopped. The MCH-M assumes
• C4 (DeepER Sleep): The C4 state appears to Intel 845MP/845MZ as identical to the C3 state, but
state
G0
G0
G0
G0
G0
G1
G1
G1
G2
G3
deasserted and the processor core is active. The processor can service snoops and maintain cache
coherency in this state.
Halt instruction. This stops the execution of the instruction stream and reduces the processor’s
power consumption. The processor can service snoops and maintain cache coherency in this state.
service snoops and maintain cache coherency in this state.
that no AGP, AGP/PCI, or HubLink cycles (except special cycles) will occur while the MCH-M is
in this state. The processor cannot snoop its caches to maintain coherency while in the C3 state.
in this state the processor core voltage is lowered. There are no internal events in Intel
845MP/845MZ for the C4 state that differ from the C3 state.
Sleep (S)
State
S1M
N/A
S0
S0
S0
S0
S0
S3
S4
S5
CPU (C)
State
N/A
N/A
N/A
N/A
N/A
C0
C1
C2
C3
C4
(FCLK)
Clock
CPU
On
On
On
Off
Off
Off
Off
Off
Off
Off
Datasheet
Host Clock
MCH-M
(DCLK)
On
On
On
On
Off
Off
Off
Off
Off
On
Intel
®
82845MP/82845MZ Chipset-Mobile (MCH-M)
PwrDown Self Refresh
PwrDown Self Refresh
PwrDown Self Refresh
PwrDown Self Refresh
PwrDown Self Refresh
PwrDown Self Refresh
System Memory
On
On
On
Off
Processor State
DeepER Sleep
Deep Sleep
Stop Grant
Auto-Halt
Full On
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