Datasheet

Register Description
R
Datasheet 119
4.11.13 SVID – Subsystem Vendor Identification Register (Device
#2)
Address Offset: 2C−2Dh
Default Value: 0000h
Access: Read/Write Once
Size: 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.
4.11.14 SID – Subsystem Identification Register (Device #2)
Address Offset: 2E−2Fh
Default Value: 0000h
Access: Read/Write Once
Size: 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.
4.11.15 ROMADR – Video BIOS ROM Base Address Registers
(Device #2)
Address Offset: 30−33h
Default Value: 00000000h
Access: Read Only
Size: 32 bits
The IGD does not use a separate BIOS ROM, therefore this register is hardwired to 0’s.
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.