Processor Configuration Registers
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:
0/0/0/PCI
Eh
00h
RO
8 bits
Size:
Reset
Value
RST/
PWR
Bit
Access
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.
7:0
RO
00h
Uncore
2.5.8
SVID—Subsystem Vendor Identification Register
This value is used to identify the vendor of the subsystem.
B/D/F/Type:
Address Offset:
Reset Value:
Access:
0/0/0/PCI
2C–2Dh
0000h
RW-O
16 bits
Size:
Reset
Value
RST/
PWR
Bit
Access
Description
Subsystem Vendor ID (SUBVID)
This field should be programmed during boot-up to indicate the
vendor of the system board. After it has been written once, it
becomes read only.
15:0
RW-O
0000h
Uncore
2.5.9
SID—Subsystem Identification Register
This value is used to identify a particular subsystem.
B/D/F/Type:
Address Offset:
Reset Value:
Access:
0/0/0/PCI
2E–2Fh
0000h
RW-O
Size:
16 bits
Reset
Value
RST/
PWR
Bit
Access
Description
Subsystem ID (SUBID)
15:0
RW-O
0000h
Uncore
This field should be programmed during BIOS initialization. After
it has been written once, it becomes read only.
Datasheet, Volume 2
53
INTEL [ INTEL ]
