STG3000X-RIVA128 STMicroelectronics, STG3000X-RIVA128 Datasheet - Page 76

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

RIVA 128
Byte offsets 0x4F - 0x4C
AGP Command Register (0x4F - 0x4C = CAP_PTR + 8)
Byte offset 0xFF - 0x50
76/77
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
31:24
23:10
Bits
7:3
2:0
9
8
0x
Function
This field is set to the minimum request depth of the target as reported in its
RQ field.
Reserved
SBA_ENABLE enables sideband addressing when set. The RIVA 128 does
not implement sideband addressing.
AGP_ENABLE allows the RIVA 128 to act as an AGP master and initiate AGP
operations. The target must be enabled before enabling the RIVA 128
0 = disabled
1 = AGP operations enabled
Reserved
The DATA_RATE field must be set to 0x01 to indicate 66MHz/1x transfer
mode. This value must also be set on the target before being enabled.
0x
Reserved = 0x00000000
128-BIT 3D MULTIMEDIA ACCELERATOR
0x
9
9
8
8
7
7
6
6
5
5
4
4
0x
R W 0x01
3
3
R W 0
R W I
R W -
R - 0
R - 0
R - 0
2
2
1
1
0
0