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30 Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families
Datasheet Volume One of Two
Generic PECI specification details are out of the scope of this document. What follows is
a processor-specific PECI client definition, and is largely an addendum to the PECI
Network Layer and Design Recommendations sections for the PECI specification.
Note: The PECI commands described in this document apply primarily to the Intel® Xeon®
processor E5-1600 v2/E5-2600 v2 product families. The processors utilizes the
capabilities described in this document to indicate support for four memory channels.
Refer to
Table 2-1 for the list of PECI commands supported by the processors.
2.5.1 PECI Client Capabilities
The processor PECI client is designed to support the following sideband functions:
• Processor and DRAM thermal management
• Platform manageability functions including thermal, power, and error monitoring
— The platform ‘power’ management includes monitoring and control for both the
processor and DRAM subsystem to assist with data center power limiting.
2.5.1.1 Thermal Management
Processor fan speed control is managed by comparing Digital Thermal Sensor (DTS)
thermal readings acquired via PECI against the processor-specific fan speed control
reference point, or T
CONTROL
. Both T
CONTROL
and DTS thermal readings are accessible
via the processor PECI client. These variables are referenced to a common
temperature, the TCC activation point, and are both defined as negative offsets from
that reference.
PECI-based access to the processor package configuration space provides a means for
Baseboard Management Controllers (BMCs) or other platform management devices to
actively manage the processor and memory power and thermal features. Details on the
list of available power and thermal optimization services can be found in
Section 2.5.2.6.
2.5.1.2 Platform Manageability
PECI allows read access to certain error registers in the processor MSR space and
status monitoring registers in the PCI configuration space within the processor and
downstream devices. Details are covered in subsequent sections.
Table 2-1. Summary of Processor-specific PECI Commands
Command Supported on the Processor
Ping() Yes
GetDIB() Yes
GetTemp() Yes
RdPkgConfig() Yes
WrPkgConfig() Yes
RdIAMSR() Yes
WrIAMSR() No
RdPCIConfig() Yes
WrPCIConfig() No
RdPCIConfigLocal() Yes
WrPCIConfigLocal() Yes