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Register Description
D15343-003 107
4.11.13 SVID – Subsystem Vendor Identification Register (Device #2)
4.11.14 SID – Subsystem Identification Register (Device #2)
4.11.15 ROMADR – Video BIOS ROM Base Address Registers (Device #2)
The IGD does not use a separate BIOS ROM, therefore this register is hardwired to 0's.
Address Offset:
Default Value:
Access:
Size:
2C-2Dh
0000h
Read/Write Once
16 bits
Bit Description
15:0 Subsystem Vendor ID: This value is used to identify the vendor of the subsystem. This register
should be programmed by BIOS during boot-up. Once written, this register becomes Read Only.
This register can only be cleared by a reset.
Address Offset:
Default Value:
Access:
Size:
2E-2Fh
0000h
Read/Write Once
16 bits
Bit Description
15:0 Subsystem Identification: This value is used to identify a particular subsystem. This field should
be programmed by BIOS during boot-up. Once written, this register becomes Read Only. This
register can only be cleared by a reset.
Address Offset:
Default Value:
Access:
Size:
30-33h
00000000h
Read Only
32 bits
Bit Description
31:18 ROM Base Address–RO
17:11 Address Mask–RO: Indicates 256-kB address range.
10:1 Reserved
0 ROM BIOS Enable–RO: Indicates ROM not accessible.