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Identification Information
Component Identification via Programming Interface
The Intel® Xeon® Processor 5500 Series stepping can be identified by the following
register contents:
Reserved
31:28
Notes:
1.
The Extended Family, bits [27:20] are used in conjunction with the Family Code, specified in bits [11:8],
to indicate whether the processor belongs to the Intel386™, Intel486™, Pentium®, Pentium® Pro,
Pentium® 4, Intel® Core™ processor family or Intel® Core™ i7 family.
2.
The Extended Model, bits [19:16] in conjunction with the Model Number, specified in bits [7:4], are
used to identify the model of the processor within the processor's family.
3.
The Processor Type, specified in bits [13:12] indicates whether the processor is an original OEM
processor, an OverDrive processor, or a dual processor (capable of being used in a dual processor
system).
4.
The Family Code corresponds to bits [11:8] of the EDX register after RESET, bits [11:8] of the EAX
register after the CPUID instruction is executed with a 1 in the EAX register, and the generation field of
the Device ID register accessible through Boundary Scan.
5.
The Model Number corresponds to bits [7:4] of the EDX register after RESET, bits [7:4] of the EAX
register after the CPUID instruction is executed with a 1 in the EAX register, and the model field of the
Device ID register accessible through Boundary Scan.
6.
The Stepping ID in bits [3:0] indicates the revision number of that model. See
stepping ID number in the CPUID information.
When EAX is initialized to a value of '1', the CPUID instruction returns the Extended
Family, Extended Model, Processor Type, Family Code, Model Number and Stepping ID
value in the EAX register. Note that the EDX processor signature value after reset is
equivalent to the processor signature output value in the EAX register.
Cache and TLB descriptor parameters are provided in the EAX, EBX, ECX and EDX
registers after the CPUID instruction is executed with a 2 in the EAX register.
Intel® Xeon® Processor 5500 Series
Specification Update, February 2014
Extended
Extended
Reserved
1
2
Family
Model
27:20
19:16
00000000b
0001b
Processor
Family
3
Type
Code
15:14
13:12
11:8
00b
0110
Model
Stepping
4
5
6
Number
ID
7:4
3:0
1010b
xxxxb
Table 1
for the processor
17
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