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參數(shù)資料
| 型號： | 82815EM |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項-數(shù)據表參考 |
| 文件頁數(shù)： | 149/163頁 |
| 文件大?。?/td> | 1049K |
| 代理商： | 82815EM |
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Intel
82815EM GMCH
R
Datasheet
149
4.18.
ACPI Support
Advanced Configuration and Power Management Interface. ACPI primarily describes and runs
motherboard devices. It is completely controlled by the operating system that OS drivers directly power
down PCI/AGP devices. System or SMI BIOS plays a part of waking the system, however. Device
drivers save and restore state while bus drivers change the physical power state of the device.
The Intel
815EM chipset power management architecture is designed to allow a single system to
support multiple suspend modes and to switch between those modes as required. A suspended system
can be resumed via a number of different events. It will then return to full operation where it can
continue processing or be placed into another suspend mode (potentially a lower power mode than it
resumed from).
Intel
815EM chipset supports the minimum requirements for ACPI support. Intel
815EM chipset must
support the minimum requirements for both system logic and for graphics controllers, as well as be
capable of controlling monitors minimum functions. The transition sequences of entering and exiting
C2/C3/S1/S3 states are described in respective sections below.
4.18.1.
Full on (C0 State)
C0 state is normal operation mode that processor executes instructions. According to typical usage
models running battery life benchmark programs, processor is in C0 about 20% of time. To save power,
the following is recommended:
If IOQ and Deferred Queue are empty, Intel
815EM chipset shuts down GTL buffer sense amps. When
there is a need to snoop, the logic wakes up on detection of signal ADS#.
4.18.2.
Stop Grant or Quick Start (C2 State)
Stop-Grant for Desktop or Quick-start for Mobile: The STPCLK# signal goes active to the processor.
The processor performs a Stop-Grant cycle, halts its instruction stream, and remain in that state until the
STPCLK# signal goes inactive. In the Stop-Grant state, the processor snoops the bus and maintains cache
coherency. The Quick-start state is lower power version, but there are restrictions on what interrupt
signals can go active while STPCLK# is active. Note: Some mobile systems may use the Stop-Grant state
rather than the Quick-start state.
4.18.3.
Stop Clock (C3 State)
According to typical usage models running battery life programs, processor could be in C3 deep sleep
mode 64% of time. The ICH2-M performs stop clock functions with the processor directly. The
involvement of Intel
815EM chipset is limited to the following functions: As a result of STPCLK#
assertion, the processor responds with a Stop Grant special cycle which Intel
815EM chipset passes
down to Hub Interface to ICH2-M.
Similarly, as a result of Halt instruction, the processor performs Halt special cycle that Intel
815EM
chipset passes to Hub Interface to ICH2-M. Intel
815EM chipset does
not
prevent snoops while in the
Stop Grant State. There are a lot of power savings from Platform viewpoint.
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