Datasheet

Intel
®
QuickPath Architecture System Address Decode Register Description
344 Datasheet, Volume 2
3.4.4 CCR—Class Code Register
This register contains the Class Code for the device. Writes to this register have no
effect.
Device: 0
Function: 0–1
Offset: 09h
Device: 2
Function: 0–1
Offset: 09h
Bit Type
Reset
Value
Description
23:16 RO 06h
Base Class
This field indicates the general device category. For the processor, this
field is hard wired to 06h, indicating it is a “Bridge Device”.
15:8 RO 0
Sub-Class
This field qualifies the Base Class, providing a more detailed specification
of the device function.
For all devices the default is 00h, indicating “Host Bridge”.
7:0 RO 0
Register-Level Programming Interface
This field identifies a specific programming interface (if any), that device
independent software can use to interact with the device. There are no
such interfaces defined for “Host Bridge” types, and this field is hard
wired to 00h.