Q6000 datasheet(81/98 Pages) INTEL

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Thermal Specifications and Design Considerations

5.3.2

PECI Specifications

5.3.2.1

PECI Device Address

The socket 0 PECI register resides at address 30h and socket 1 resides at 31h. Note

that each address also supports two domains (Domain 0 and Domain 1). For more

information on PECI domains, refer to the Platform Environment Control Interface

Specification.

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 known to be unresponsive.

Prior to a power on RESET# and during RESET# assertion, PECI is not ensured 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 damaging states. 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 GetTemp0()s or GetTemp1()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() and GetTemp1() Error Code Support

The error codes supported for the processor GetTemp0() and GetTemp1() commands

are listed in Table 30.

§ §

Table 30.

GetTemp0() and GetTemp1() Error Codes

Error Code

Description

8000h

General sensor error

8002h

Sensor is operational, but has detected a temperature below its operational

range (underflow).

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