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Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families 49
Datasheet Volume One
2.5.2.6.12 Package Identifier Read
This feature enables the PECI host to uniquely identify the PECI client processor. The
parameter field encodings shown in Table 2-8 allow the PECI host to access the
relevant processor information as described below.
• CPUID data: This is the equivalent of data that can be accessed through the
CPUID instruction execution. It contains processor type, stepping, model and
family ID information as shown in Figure 2-21.
• Platform ID data: The Platform ID data can be used to ensure processor
microcode updates are compatible with the processor. The value of the Platform ID
or Processor Flag[2:0] as shown in Figure 2-22 is typically unique to the platform
type and processor stepping. Refer to the Intel® 64 and IA-32 Architectures
Software Developer’s Manual (SDM) Volumes 1, 2, and 3 for more information.
• PCU Device ID: This information can be used to uniquely identify the processor
power control unit (PCU) device when combined with the Vendor Identification
register content and remains constant across all SKUs. Refer to the appropriate
register description for the exact processor PCU Device ID value.
• Max Thread ID: The maximum Thread ID data provides the number of supported
processor threads. This value is dependent on the number of cores within the
processor as determined by the processor SKU and is independent of whether
certain cores or corresponding threads are enabled or disabled.
Figure 2-21. CPUID Data
CPU ID Data
Model
4
20
Stepping ID
3 0
Family ID
16
Processor
Type
1931
RESERVED
27
Extended
Model
Extended
Family ID
78111228
RESERVED
1315
Figure 2-22. Platform ID Data
Platform ID Data
Processor
Flag
Reserved
231 03
Figure 2-23. PCU Device ID
PCU Device ID Data
RESERVED
031
PCU Device ID
1516