Identification Information
14
Specification Update
Identification Information
Component Identification via Programming Interface
The Intel® Celeron® P4000 and U3000 Mobile Processor Series stepping can be
identified by the following processor signatures:
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, 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 1 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, 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.
The Intel® Celeron® P4000 and U3000 Mobile Processor Series can be identified by
the following register contents:
Notes:
1. The Vendor ID corresponds to Bits 15:0 of the Vendor ID Register located at offset 00–01h
in the PCI function 0 configuration space.
2. The Device ID corresponds to Bits 15:0 of the Device ID Register located at Device 0 offset
02–03h in the PCI function 0 configuration space.
3. The Revision Number corresponds to Bits 7:0 of the Revision ID Register located at offset
08h in the PCI function 0 configuration space.
4. Correct Host Device ID requires firmware support.
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 0010b 00b 0110 0101b xxxxb
Processor
Stepping
Vendor ID
1
Device ID
2
Revision ID
3
C-2 8086h 0044h 12h
K-0 8086h 0044h 18h
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