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Register Description
D15343-003 77
4.9.8 HDR – Header Type Register
This register identifies the header layout of the configuration space. No physical register exists at
this location.
4.9.9 SVID – Subsystem Vendor Identification Register
This value is used to identify the vendor of the subsystem.
4.9.10 SID – Subsystem Identification Register
This value is used to identify a particular subsystem.
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. Reads and 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.
Address Offset:
Default Value:
Access:
Size:
2E-2Fh
0000h
Read/Write Once
16 bits
Bit Descriptions
15:0 Subsystem ID (SUBID): This field should be programmed during BIOS initialization. After it has
been Written once, it becomes Read Only.