Rid - Revision Identification Register; Ccr - Class Code Register - Intel I7-900 DESKTOP PROCESSOR - DATASHEET VOLUME 2 Datasheet

Register Description
2.5.3

RID - Revision Identification Register

This register contains the revision number of the processor. The Revision ID (RID) is a
traditional 8-bit Read Only (RO) register located at offset 08h in the standard PCI
header of every PCI/PCI Express compatible device and function.
Device:
Function:
Offset:
Device:
Function:
Offset:
Device:
Function:
Offset:
Device:
Function:
Offset:
Bit
7:0
2.5.4

CCR - Class Code Register

This register contains the Class Code for the device. Writes to this register have no
effect.
Device:
Function:
Offset:
Device:
Function:
Offset:
Device:
Function:
Offset:
Device:
Function:
Offset:
Bit
23:16
15:8
7:0
Datasheet
0
0-1
08h
2
0-1, 4-5
08h
3
0-2, 4
08h
4-6
0-3
08h
Reset
Type
Value
Revision Identification Number
Refer to the
RO 0h
®
and Intel
the value of the Revision ID Register.
0
0-1
09h
2
0-1, 4-5
09h
3
0-2, 4
09h
4-6
0-3
09h
Reset
Type
Value
Base Class
RO 06h
This field indicates the general device category. For the processor, this field is
hardwired to 06h, indicating it is a "Bridge Device".
Sub-Class
This field qualifies the Base Class, providing a more detailed specification of
RO 0
the device function.
For all devices the default is 00h, indicating "Host Bridge".
Register-Level Programming Interface
This field identifies a specific programming interface (if any), that device
RO 0
independent software can use to interact with the device. There are no such
interfaces defined for "Host Bridge" types, and this field is hardwired to 00h.
Description
®
Intel Core™ i7-900 Desktop Processor Extreme Edition Series
Core™ i7-900 Desktop Processor Series Specification Update
Description
for
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