RG82845M Intel, RG82845M Datasheet - Page 124

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

Intel
5.4.3.
5.4.4.
124
Table 33. Intel 845MP/845MZ Power Transitions
®
82845MP/82845MZ Chipset-Mobile (MCH-M)
General Description of ACPI System States
Power Transitions
Hublink Interface
Intel SpeedStep
State/Feature
Dynamic RAC
Buffer Sense
Clock Gating
Amp Disable
AGP/Hublink
• S0 (Awake): In this state all power planes are active.
• S1-M (Powered on Suspend for Mobile Systems): Power is maintained to the CPU and all system
• S2: ACPI S2 state is not supported in the Intel 845MP/845MZ Chipset platform.
• S3 (Suspend To RAM): The next level of power reduction occurs when the clock synthesizer and
• S4 (Suspend to Disk) and S5 (Soft Off): In these states the main memory power plane is shut
•
GTL Control
Technology
Reduction
Transition
CPU PLL
DRCG
components, but most clocks are stopped by the clock synthesizer.
core well power planes for the processor and chipset are shut down, but the main memory power
plane and the ICH3-M resume well remain active. This is the Suspend To RAM (STR) state. All
clocks from synthesizers are shut down during the S3 state.
down in addition to the clock synthesizer and core well power planes for the processor and chipset.
The ICH3-M resume well is still powered.
G3 (Mechanical Off): In this state only the RTC (Real Time Clock) well is powered. The system
can only be reactivated via the power switch.
Power
ACPI
DDR
RAC
PLL
Active/Standby
Yes (during
Running
Running
Running
Enabled
writes)
& Nap
Active
Active
CO
No
No
Active/Standby
Yes (during
Running
Running
Running
Enabled
Datasheet
writes)
& Nap
Active
Active
C1
No
No
during snoops)
Nap, Active, &
Yes (enabled
Standby
Running
Running
Running
Enabled
C2/S1D
Active
Active
No
No
Power-down
Power-down
Clock Stop
Running
Running
Enabled
C3/C4
Active
Mode
Yes
Yes
No
250687-002
Power-down
Power-down
Power-down
Power-down
Running
Running
Enabled
REQ1
S1M
Yes
Yes
No
R