Datasheet

Register Description
R
Datasheet 109
3.8.8 HDR – Header Type Register (Device #0, Function #1)
Address Offset: 0Eh
Default Value: 80h
Access: Read Only
Size: 8 bits
This register identifies the header layout of the configuration space. No physical register exists at
this location.
Bit Description
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.
3.8.9 SVID – Subsystem Vendor Identification Register (Device
#0, Function #1)
Address Offset: 2C-2Dh
Default Value: 0000h
Access: Read/Write Once
Size: 16 bits
This value is used to identify the vendor of the subsystem.
Bit Description
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.
3.8.10 SID – Subsystem Identification Register (Device #0,
Function #1)
Address Offset: 2E-2Fh
Default Value: 0000h
Access: Read/Write Once
Size: 16 bits
This value is used to identify a particular subsystem.
Bit Description
15:0 Subsystem ID (SUBID): This field should be programmed during BIOS initialization.
After it has been Written once, it becomes Read Only.