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Thermal Specifications
6.3.1.3
Processor Interface Tuning and Diagnostics
Intel Xeon processor 5500 series Intel IBIST allows for in-field diagnostic capabilities in
Intel QuickPath Interconnect and memory controller interfaces. PECI provides a port to
execute these diagnostics via its PCI Configuration read and write capabilities.
6.3.2
Client Command Suite
6.3.2.1
Ping()
Ping() is a required message for all PECI devices. This message is used to enumerate
devices or determine if a device has been removed, been powered-off, etc. A Ping()
sent to a device address always returns a non-zero Write FCS if the device at the
targeted address is able to respond.
6.3.2.1.1
Command Format
The Ping() format is as follows:
Write Length: 0
Read Length: 0
Figure 6-9.
Ping()
Byte #
Byte
Definition
0
1
2
3
Client Address
Write Length
0x00
Read Length
0x00
FCS
An example Ping() command to PECI device address 0x30 is shown below.
Figure 6-10. Ping() Example
Byte #
Byte
Definition
6.3.2.2
0
1
2
3
0x30
0x00
0x00
0xe1
GetDIB()
The processor PECI client implementation of GetDIB() includes an 8-byte response and
provides information regarding client revision number and the number of supported
domains. All processor PECI clients support the GetDIB() command.
6.3.2.2.1
Command Format
The GetDIB() format is as follows:
Write Length: 1
Read Length: 8
Command: 0xf7
Intel® Xeon® Processor 5500 Series Datasheet, Volume 1
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