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參數(shù)資料
| 型號： | BX80551PG3000FN |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 3000 MHz, MICROPROCESSOR, PBGA775 |
| 封裝： | FLIP CHIP, LGA-775 |
| 文件頁數(shù)： | 94/106頁 |
| 文件大小： | 2713K |
| 代理商： | BX80551PG3000FN |
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88
Datasheet
Features
6.2.4
Enhanced HALT Snoop or HALT Snoop State, Grant Snoop
State
The Enhanced HALT Snoop State is used in conjunction with the new Enhanced HALT state. If
Enhanced HALT state is not enabled in the BIOS, the default Snoop State entered will be the
HALT Snoop State. Refer to the sections below for details on HALT Snoop State, Grant Snoop
State and Enhanced HALT Snoop State.
6.2.4.1
HALT Snoop State, Grant Snoop State
The processor will respond to snoop transactions on the FSB while in Stop-Grant state or in HALT
Power Down state. During a snoop transaction, the processor enters the HALT:Grant Snoop state.
The processor will stay in this state until the snoop on the FSB has been serviced (whether by the
processor or another agent on the FSB). After the snoop is serviced, the processor will return to the
Stop-Grant state or HALT Power Down state, as appropriate.
6.2.4.2
Enhanced HALT Snoop State
The Enhanced HALT Snoop State is the default Snoop State when the Enhanced HALT state is
enabled via the BIOS. The processor will remain in the lower bus ratio and VID operating point of
the Enhanced HALT state.
While in the Enhanced HALT Snoop State, snoops are handled the same way as in the HALT
Snoop State. After the snoop is serviced the processor will return to the Enhanced HALT Power
Down state.
6.2.5
Enhanced Intel SpeedStep Technology
Enhanced Intel SpeedStep Technology enables the processor to switch between frequency and
voltage points, which may result in platform power savings. To support this technology, the system
must support dynamic VID transitions. Switching between voltage/frequency states is software
controlled.
Note:
Not all processors are capable of supporting Enhanced Intel SpeedStep Technology. More details
on which processor frequencies support this feature will be provided in future releases of the Intel
Pentium Processor Extreme Edition and Intel Pentium D Processor Specification Update.
Enhanced Intel SpeedStep Technology is a technology that creates processor performance states
(P states). P states are power consumption and capability states within the Normal state as shown in
Figure 6-1. Enhanced Intel SpeedStep Technology enables real-time dynamic switching between
frequency and voltage points. It alters the performance of the processor by changing the bus to core
frequency ratio and voltage. This allows the processor to run at different core frequencies and
voltages to best serve the performance and power requirements of the processor and system. Note
that the front side bus is not altered; only the internal core frequency is changed. To run at reduced
power consumption, the voltage is altered in step with the bus ratio.
The following are key features of Enhanced Intel SpeedStep Technology:
Voltage/Frequency selection is software controlled by writing to processor MSRs (Model
Specific Registers), thus eliminating chipset dependency.
— If the target frequency is higher than the current frequency, VCC is incremented in steps
(+12.5 mV) by placing a new value on the VID signals and the processor shifts to the new
frequency. Note that the top frequency for the processor can not be exceeded.
— If the target frequency is lower than the current frequency, the processor shifts to the new
frequency and VCC is then decremented in steps (-12.5 mV) by changing the target VID
through the VID signals.
§
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