Intel E3300 Data Sheet - Page 83

PECI Specifications

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Thermal Specifications and Design Considerations 5.3.2 5.3.2.1 5.3.2.2 5.3.2.3 5.3.2.4 Table 27. PECI Specifications PECI Device Address The PECI register resides at address 30h. PECI Command Support PECI command support is covered in detail in the Platform Environment Control Interface Specification. Refer to this document for details on supported PECI command function and codes. PECI Fault Handling Requirements PECI is largely a fault tolerant interface, including noise immunity and error checking improvements over other comparable industry standard interfaces. The PECI client is as reliable as the device that it is embedded in, and thus given operating conditions that fall under the specification, the PECI will always respond to requests and the protocol itself can be relied upon to detect any transmission failures. There are, however, certain scenarios where the PECI is know to be unresponsive. Prior to a power-on RESET# and during RESET# assertion, PECI is not assured to provide reliable thermal data. System designs should implement a default power-on condition that ensures proper processor operation during the time frame when reliable data is not available using PECI. To protect platforms from potential operational or safety issues due to an abnormal condition on PECI, the Host controller should take action to protect the system from possible damage. It is recommended that the PECI host controller take appropriate action to protect the client processor device if valid temperature readings have not been obtained in response to three consecutive GetTemp()s or for a one second time interval. The host controller may also implement an alert to software in the event of a critical or continuous fault condition. PECI GetTemp0() Error Code Support The error codes supported for the processor GetTemp() command are listed in Table 27: GetTemp0() Error Codes Error Code Description 8000h 8002h General sensor error Sensor is operational, but has detected a temperature below its operational range (underflow) § § Datasheet 83

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Datasheet
83
Thermal Specifications and Design Considerations
5.3.2
PECI Specifications
5.3.2.1
PECI Device Address
The PECI register resides at address 30h.
5.3.2.2
PECI Command Support
PECI command support is covered in detail in the
Platform Environment Control
Interface Specification
. Refer to this document for details on supported PECI command
function and codes.
5.3.2.3
PECI Fault Handling Requirements
PECI is largely a fault tolerant interface, including noise immunity and error checking
improvements over other comparable industry standard interfaces. The PECI client is
as reliable as the device that it is embedded in, and thus given operating conditions
that fall under the specification, the PECI will always respond to requests and the
protocol itself can be relied upon to detect any transmission failures. There are,
however, certain scenarios where the PECI is know to be unresponsive.
Prior to a power-on RESET# and during RESET# assertion, PECI is not assured to
provide reliable thermal data. System designs should implement a default power-on
condition that ensures proper processor operation during the time frame when reliable
data is not available using PECI.
To protect platforms from potential operational or safety issues due to an abnormal
condition on PECI, the Host controller should take action to protect the system from
possible damage. It is recommended that the PECI host controller take appropriate
action to protect the client processor device if valid temperature readings have not
been obtained in response to three consecutive GetTemp()s or for a one second time
interval. The host controller may also implement an alert to software in the event of a
critical or continuous fault condition.
5.3.2.4
PECI GetTemp0() Error Code Support
The error codes supported for the processor GetTemp() command are listed in
Table 27
:
§ §
Table 27.
GetTemp0() Error Codes
Error Code
Description
8000h
General sensor error
8002h
Sensor is operational, but has detected a temperature below its operational
range (underflow)