NEC Intel Xeon E5-2420 N8101-571F User Manual

Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families

75

Datasheet Volume One

The Client responds with an Abort FCS under the following conditions:

• The decoded command is not understood or not supported on this processor (this 

includes good command codes with bad Read Length or Write Length bytes).

• Assured Write FCS (AW FCS) failure. Under most circumstances, an Assured Write 

failure will appear as a bad FCS. However, when an originator issues a poorly 
formatted command with a miscalculated AW FCS, the client will intentionally abort 

the FCS in order to guarantee originator notification.

Some PECI commands respond with a completion code byte. These codes are designed 

to communicate the pass/fail status of the command and may also provide more 

detailed information regarding the class of pass or fail. For all commands listed in 

 that support completion codes, the definition in the following table 

applies. Throughout this document, a completion code reference may be abbreviated 

with ‘CC’.

An originator that is decoding these commands can apply a simple mask as shown in 

 to determine a pass or fail. Bit 7 is always set on a command that did not 

complete successfully and is cleared on a passing command.

The codes explicitly defined in 

 may be useful in PECI originator response 

algorithms. Reserved or undefined codes may also be generated by a PECI client 

device, and the originating agent must be capable of tolerating any code. The Pass/Fail 

mask defined in 

 applies to all codes, and general response policies may be 

based on this information. Refer to 

 for originator response policies and 

recommendations.

0xxx xxxxb

Command passed

1xxx xxxxb

Command failed

0x40

Command Passed

CC: 0x80

Response timeout. The processor was not able to generate the required response in a timely 

fashion. Retry is appropriate.

CC: 0x81

Response timeout. The processor was not able to allocate resources for servicing this 

command. Retry is appropriate.

CC: 0x82

The processor hardware resources required to service this command are in a low power 

state. Retry may be appropriate after modification of PECI wake mode behavior if 

appropriate.

CC: 0x83-8F

Reserved

CC: 0x90

Unknown/Invalid/Illegal Request

CC: 0x91

PECI control hardware, firmware or associated logic error. The processor is unable to process 

the request.

CC: 0x92-9F

Reserved