Intel G645 CM8062301262601 User Manual

90

Datasheet, Volume 2

This register contains the revision number of the processor root port. These bits are 
read only and writes to this register have no effect.

This register identifies the basic function of the device, a more specific sub-class, and a 
register- specific programming interface.

7:4

RO-FW

0h

Uncore

Revision Identification Number MSB (RID_MSB)
This is an 8-bit value that indicates the revision identification 

number for the root port. Refer to the 2nd Generation Intel

Specification Update for the value of the RID register. 

3:0

RO-FW

0h

Uncore

Revision Identification Number (RID)
This is an 8-bit value that indicates the revision identification 

number for the root port. Refer to the 2nd Generation Intel

Specification Update for the value of the RID register. 

23:16

RO

06h

Uncore

Base Class Code (BCC)
This field indicates the base class code for this device. This code 

has the value 06h, indicating a Bridge device. 

15:8

RO

04h

Uncore

Sub-Class Code (SUBCC)
This field indicates the sub-class code for this device. The code is 

04h indicating a PCI to PCI Bridge. 

7:0

RO

00h

Uncore

Programming Interface (PI)
This field indicates the programming interface of this device. This 

value does not specify a particular register set layout and provides 

no practical use for this device.