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550 参数 Datasheet PDF下载

550图片预览
型号: 550
PDF下载: 下载PDF文件 查看货源
内容描述: 奔腾4处理器,支持超线程技术 [Pentium 4 Processors Supporting Hyper-Threading Technology]
分类和应用:
文件页数/大小: 96 页 / 1585 K
品牌: INTEL [ INTEL ]
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Thermal Specifications and Design Considerations  
Figure 5-4. Thermal Monitor 2 Frequency and Voltage Ordering  
TTM2  
Temperature  
Frequency  
fMAX  
fTM2  
VID  
VIDTM2  
VID  
PROCHOT#  
Time  
The PROCHOT# signal is asserted when a high temperature situation is detected, regardless of  
whether or not Thermal Monitor or Thermal Monitor 2 is enabled.  
It should be noted that the Thermal Monitor 2 TCC can not be activated via the on demand mode.  
The Thermal Monitor TCC, however, can be activated through the use of the on demand mode.  
5.2.3  
On-Demand Mode  
The Pentium 4 processor in the 775-land package provides an auxiliary mechanism that allows  
system software to force the processor to reduce its power consumption. This mechanism is  
referred to as "On-Demand" mode and is distinct from the Thermal Monitor feature. On-Demand  
mode is intended as a means to reduce system level power consumption. Systems using the  
Pentium 4 processor in the 775-land package must not rely on software usage of this mechanism to  
limit the processor temperature.  
If bit 4 of the ACPI P_CNT Control Register (located in the processor IA32_THERM_CONTROL  
MSR) is written to a '1', the processor will immediately reduce its power consumption via  
modulation (starting and stopping) of the internal core clock, independent of the processor  
temperature. When using On-Demand mode, the duty cycle of the clock modulation is  
programmable via bits 3:1 of the same ACPI P_CNT Control Register. In On-Demand mode, the  
duty cycle can be programmed from 12.5% on/ 87.5% off, to 87.5% on/12.5% off in 12.5%  
increments. On-Demand mode may be used in conjunction with the Thermal Monitor. If the system  
tries to enable On-Demand mode at the same time the TCC is engaged, the factory configured duty  
cycle of the TCC will override the duty cycle selected by the On-Demand mode.  
Datasheet  
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