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Register Description
D15343-003 55
4.8.7 BCC – Base Class Code Register
This register contains the Base Class code of the GMCH Device #0. This code is 06h indicating a
Bridge device.
4.8.8 HDR – Header Type Register
This register identifies the header layout of the configuration space. No physical register exists at
this location.
4.8.9 SVID – Subsystem Vendor Identification Register
This value is used to identify the vendor of the subsystem.
Address Offset:
Default Value:
Access:
Size:
0Bh
06h
Read only
8 bits
Bit Descriptions
7:0 Base Class Code (BASEC): This is an 8-bit value that indicates the Base Class Code for the
GMCH. This code has the value 06h, indicating a Bridge device.
Address Offset:
Default Value:
Access:
Size:
0Eh
80h
Read only
8 bits
Bit Descriptions
7:0 PCI Header (HDR): This field always returns 80 to indicate that Device #0 is a multifunction
device. If Functions other than 0 are disabled, this field returns a 00 to indicate that the GMCH is a
single function device with standard header layout. Writes to this location have no effect.
Address Offset:
Default Value:
Access:
Size:
2C-2Dh
0000h
Read/Write Once
16 bits
Bit Descriptions
15:0 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.