STG3000X-RIVA128 STMicroelectronics, STG3000X-RIVA128 Datasheet - Page 74

• Manufacturer Part Number: STG3000X-RIVA128
• Description: 128-BIT 3D MULTIMEDIA ACCELERATOR
• Manufacturer: STMicroelectronics

RIVA 128
Byte offsets 0x43 - 0x40
Writeable Subsystem Vendor ID (0x43 - 0x40)
Byte offsets 0x47 - 0x44
Capabilities Identifier Register (Offset = 0x47 - 0x44 = CAP_PTR)
74/77
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31:16
31:24
23:20
19:16
Bits
15:0
Bits
15:8
7:0
0x43
0x47
Function
This SUBSYSTEM_ID field is aliased at 0x2F - 0x2E where it is read-only. It
may be modified by System BIOS for systems which do not have a ROM on
the RIVA 128 data pins. This will ensure valid data before enumeration by the
operating system.
This SUB_VENDOR_ID field is aliased at 0x2D - 0x2C where it is read-only. It
may be modified by System BIOS for systems which do not have a ROM on
the RIVA 128 data pins. This will ensure valid data before enumeration by the
operating system.
Function
Reserved = 0x00
This field indicates the Major revision number of the AGP specific ation that
the RIVA 128 conforms to.
= 0x01
This field indicates the Minor revision number of the AGP specific ation that
the RIVA 128 conforms to.
= 0x00
NEXT_PTR contains the pointer to the next item in the capabilities list. This is
the last entry in the capabilities list, hence it contains a null pointer = 0x00.
The CAP_ID field identifies the type of capability.
AGP = 0x02
0x42
0x46
128-BIT 3D MULTIMEDIA ACCELERATOR
0x41
0x45
9
9
8
8
7
7
6
6
5
5
0x40
0x44
4
4
3
3
R - 0x01
R - 0x00
R - 0x00
R - 0x02
R W 0
R W 0
R W I
R W I
R - 0
2
2
1
1
0
0