Identification Information
8
Specification Update
Identification Information
Intel® Atom™ Processor N500 series processor on 45-nm process stepping can be
identified by the following register contents:
Table 1. Component Identification via Programming Interface
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 15:13 12 11:8 7:4
3:0
0000000b
0001b
0b 0110b
1100b XXXXb
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, Atom or Intel Core 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 Table 2
for the processor 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, 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.
