參數(shù)資料
型號: BX80562X3210SLACU
廠商: INTEL CORP
元件分類: 微控制器/微處理器
英文描述: 64-BIT, 266 MHz, MICROPROCESSOR, PBGA775
封裝: LGA-775
文件頁數(shù): 79/96頁
文件大?。?/td> 1398K
代理商: BX80562X3210SLACU
Thermal Specifications and Design Considerations
80
Quad-Core Intel Xeon Processor 3200 Series Datasheet
5.3
Platform Environment Control Interface (PECI)
5.3.1
Introduction
Platform Environment Control Interface (PECI) offers an interface for thermal
monitoring of Intel processor and chipset components. It uses a single wire; thus,
alleviating routing congestion issues. PECI uses CRC checking on the host side to
ensure reliable transfers between the host and client devices. Also, data transfer
speeds across the PECI interface are negotiable within a wide range (2 Kbps to
2 Mbps). The PECI interface on the processor is disabled by default and must be
enabled through BIOS.
5.3.1.1
Key Difference with Legacy Diode-Based Thermal Management
Fan speed control solutions based on PECI use a TCONTROL value stored in the processor
IA32_TEMPERATURE_TARGET MSR. The TCONTROL MSR uses the same offset
temperature format as PECI though it contains no sign bit. Thermal management
devices should infer the TCONTROL value as negative. Thermal management algorithms
should use the relative temperature value delivered over PECI in conjunction with the
TCONTROL MSR value to control or optimize fan speeds. Figure 5-4 shows a conceptual
fan control diagram using PECI temperatures.
The relative temperature value reported over PECI represents the delta below the onset
of thermal control circuit (TCC) activation as indicated by PROCHOT# assertions. As the
temperature approaches TCC activation, the PECI value approaches zero. TCC activates
at a PECI count of zero.
.
Figure 5-4. Conceptual Fan Control on PECI-Based Platforms
Min
Max
Fan Speed
(RPM)
TCONTROL
Setting
TCC Activation
Temperature
PECI = 0
PECI = -10
PECI = -20
Temperature
Note: Not intended to depict actual implementation
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