Intel E5472 Data Sheet - Page 96
PECI Specifications
UPC - 735858200684
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Thermal Specifications 6.3.2 PECI Specifications 6.3.2.1 PECI Device Address The PECI device address for socket 0 is 0x30 and socket 1 is 0x31. Please note that each address also supports two domains (Domain0 and Domain1). For more information on PECI domains, please refer to the Platform Environment Control Interface (PECI) Specification. 6.3.2.2 PECI Command Support PECI command support is covered in detail in Platform Environment Control Interface Specification. Please refer to this document for details on supported PECI command function and codes. 6.3.2.3 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 PECI is known to be unresponsive. Prior to a power on RESET# and during RESET# assertion, PECI is not guaranteed 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 via 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. 6.3.2.4 PECI GetTemp0() and GetTemp1() Error Code Support The error codes supported for the processor GetTemp0() and GetTemp1() commands are listed in Table 6-12 below: Table 6-12. GetTemp0() GetTemp1()Error Codes Error Code 0x8000h 0x8002h Description General sensor error Sensor is operational, but has detected a temperature below its operational range (underflow). § 96