Lenovo AD80582QH056003 Datenblatt Seite 121

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Intel® Xeon® Processor 7400 Series Datasheet 121
Features
7.4.3.2.3 PDCKS: Processor Data Checksum
This location provides the checksum of the Processor Data Section. Writes to this
register have no effect.
7.4.3.3 Processor Core Data
This section contains core silicon-related data.
7.4.3.3.1 CPUID: Processor CPUID Signature
This location contains the CPUID, Processor Type, Family, Model and Stepping. The
CPUID field is a copy of the results in EAX[27:0] from Function 1 of the CPUID
instruction. The MSB is at location 16h, the LSB is at location 19h. Writes to this
register have no effect.
Example: If the CPUID of a processor is 000106D0h (A-0 stepping), then the value
programmed into offset 16 - 19h of the PIROM is 00041980h.
Note: The field is not aligned on a byte boundary since the first two bits of the offset are
reserved. Thus, the data must be shifted right by two in order to obtain the same
results as the CPUID instruction.
Offset: 15h
Bit Description
7:0 Processor Data Checksum
One Byte Checksum of the Header Section
00h- FFh: See Section 7.4.4 for calculation of the value
Offset: 16h-19h
Bit Description
31:30 Reserved
00b-11b: Reserved
29:21 Extended Family
00h-0Fh: Extended Family
21:18 Extended Model
0h-Fh: Extended Model
17:16 Reserved
00b-11b: Reserved
15:14 Processor Type
00b-11b: Processor Type
13:10 Processor Family
0h-Fh: Processor Family
9:6 Processor Model
0h-Fh: Processor Model
5:2 Processor Stepping
0h-Fh: Processor Stepping
1:0 Reserved
00b-11b: Reserved
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