Fujifilm Xeon 5060 S26361-F3312-L320 データシート

Dual-Core Intel

® 

Xeon

® 

Processor 5100 Series Datasheet

89

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 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 damaging states.  If the Host controller cannot complete a valid PECI 
transactions of GetTemp0() with a given PECI device over 3 consecutive failed 
transactions or a one second max specified interval, then it should take appropriate 
actions to protect the corresponding device and/or other system components from 
overheating.  The host controller may also implement an alert to software in the event 
of a critical or continuous fault condition. 

The error codes supported for the processor GetTemp0() command are listed in 

 below:

Ping()

n/a

This command targets a valid PECI device address followed by zero Write Length 

and zero Read Length.

GetTemp0()

0x01

Write Length: 1
Read Length: 2
Returns the temperature of the processor in Domain 0

0x8000

General sensor error

0x8002

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

(underflow), currently 30

o

C absolute temperature.