Intel D15343-003 - Manual (Page 56)

Intel
®
82854 Graphics Memory Controller Hub (GMCH)
56 D15343-003
4.8.10 SID – Subsystem Identification Register
This value is used to identify a particular subsystem.
4.8.11 CAPPTR – Capabilities Pointer Register
The CAPPTR provides the offset that is the pointer to the location of the first device capability in
the capability list.
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.
Address Offset:
Default Value:
Access:
Size: 34h
40h
Read Only
8 bits
Bit Descriptions
7:0 Pointer to the offset of the first capability ID register block : In this case the first capability is
the Product-Specific Capability, which is located at offset 40h.