RG82855GMESL72L Datasheet, PDF (91/213 Pages) Intel Corporation – Intel® 855GM/855GME Chipset Graphics and Memory Controller Hub (GMCH)

Register Description
R
4.9.8
HDR – Header Type Register
Address Offset:
Default Value:
Access:
Size:
0Eh
80h
Read Only
8 bits
This register identifies the header layout of the configuration space. No physical register exists at
this location.
Bit
7:0
Description
PCI Header (HDR): This field always returns 80 to indicate that Device #0 is a multifunction device.
Reads and Writes to this location have no effect.
4.9.9
SVID – Subsystem Vendor Identification Register
Address Offset:
Default Value:
Access:
Size:
2C-2Dh
0000h
Read/Write Once
16 bits
This value is used to identify the vendor of the subsystem.
Bit
15:0
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.
4.9.10
SID – Subsystem Identification Register
Address Offset:
Default Value:
Access:
Size:
2E-2Fh
0000h
Read/Write Once
16 bits
This value is used to identify a particular subsystem.
Bit
15:0
Description
Subsystem ID (SUBID): This field should be programmed during BIOS initialization. After it has been
Written once, it becomes Read Only.
Datasheet
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