Intel LF80550KF0804M Data Sheet

Dual-Core Intel® Xeon® Processor 7100 Series Datasheet

107

This location is reserved. Writes to this register have no effect.

This location provides the checksum of the Thermal Reference Data Section. Writes to 
this register have no effect.

This section provides information on key features that the platform may need to 
understand without powering on the processor.

This location contains a copy of results in EDX[31:0] from Function 1 of the CPUID 
instruction. These details provide instruction and feature support by product family. A 
decode of these bits is found in the Cedar Mill Processor Family BIOS Writers Guide or 
the AP-485 Intel

 Processor Identification and CPUID Instruction application note. 

Writes to this register have no effect.

This location contains additional feature information from the processor. Writes to this 
register have no effect.

Bit 5 and Bit 6 are mutually exclusive (only one bit will be set).

15:0

7:0

One Byte Checksum of the Header Section

00h- FFh: See 

 for calculation of the value

31:0

0000h-FFFFF: Feature Flags

7

Multi-Core (set if the processor is a dual core processor)

6

Serial signature (set if there is a serial signature at offset 4D - 54h)

5

Electronic signature present (set if there is a electronic signature at 4D - 54h)

4

Thermal Sense Device present (set if an SMBus thermal sensor on package)