Specifications
Component Identification Information
16 Intel
®
Core
™
2 Duo Processor
Specification Update
Component Identification
Information
The Intel
®
Core™2 duo processor can be identified by the following values:
Reserved
Extended
Family
1
Extended
Model
2
Reserved
Processor
Type
3
Family
Code
4
Model
Number
5
Stepping
ID
6
31:28 27:20 19:16 15:14 13:12 11:8 7:4 3:0
00000000b 0001b 00b 0110b 0111b XXXXb
When EAX is initialized to a value of 1, the CPUID instruction returns the Extended Family,
Extended Model, Type, Family, Model and Stepping 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.
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
TM
, or Enhanced Intel® Core
TM
processor
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 Error!
Reference source not found. for the processor stepping ID number in the CPUID
information.
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. Refer to the Intel Processor
Identification and the CPUID Instruction Application Note (AP-485) and the Wolfdale Family
Processor Family BIOS Writer’s Guide (BWG) for further information on the CPUID instruction.