Cc-Class Code Register; Hdr-Header Type Register - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 2 01-2011 Datasheet

Processor Configuration Registers
2.5.6 CC—Class Code Register
This register identifies the basic function of the device, a more specific sub-class, and a
register-specific programming interface.
B/D/F/Type:
Address Offset:
Reset Value:
Access:
Size:
Bit
23:16
15:8
7:0
2.5.7 HDR—Header Type Register
This register identifies the header layout of the configuration space. No physical
register exists at this location.
B/D/F/Type:
Address Offset:
Reset Value:
Access:
Size:
Bit
7:0
Datasheet, Volume 2
0/0/0/PCI
9–Bh
060000h
RO
24 bits
Reset RST/
Attr
Value PWR
RO 06h Uncore
RO 00h Uncore
RO 00h Uncore
0/0/0/PCI
Eh
00h
RO
8 bits
Reset RST/
Attr
Value PWR
RO 00h Uncore
Description
Base Class Code (BCC)
This is an 8-bit value that indicates the base class code for the Host
Bridge device. This code has the value 06h, indicating a Bridge
device.
Sub-Class Code (SUBCC)
This is an 8-bit value that indicates the category of Bridge into
which the Host Bridge device falls. The code is 00h indicating a
Host Bridge.
Programming Interface (PI)
This is an 8-bit value that 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.
Description
PCI Header (HDR)
This field always returns 0 to indicate that the Host Bridge is a
single function device with standard header layout. Reads and
writes to this location have no effect.
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