VT8601 Via, VT8601 Datasheet - Page 68

• Manufacturer Part Number: VT8601
• Description: Slot-1 / Socket-370 PCI North Bridge
• Manufacturer: Via

Port 2348 – Graphics AGP Channel 1 FB Start/Pitch ... RW
Port 234C – Graphics AGP Channel 1 FB Size .............. RW
Port 2350 – Graphics AGP Channel 1 System Start ...... RW
Port 2354 – Graphics AGP Chan 1/2 System Pitch ........ RW
Port 2358 – Graphics AGP Channel 2 System Start ...... RW
Port 235C – Graphics AGP Channel 2 FB Start/Pitch . RW
Port 2360 – Graphics AGP Channel 2 FB Size ............... RW
Revision 1.3 September 8, 1999
31-22 Frame Buffer Line Offset (in quadwords)
21-19 Reserved
31-13 X Direction (in quadwords minus one)
12-10 Reserved
31-27 Reserved
26-16 Ch 2 System Memory Line Offset (in quadwords)
15-11 Reserved
31-22 Frame Buffer Line Offset (in quadwords)
21-19 Reserved
31-27 Reserved
26-16 Ch 2 System Memory Line Offset (in quadwords)
15-11 Reserved
18-0 Frame Buffer Starting Address
31-3 Channel 1 System Memory Start Address
10-0 Ch 1 System Memory Line Offset (in quadwords)
31-3 Channel 2 System Memory Start Address
18-0 Frame Buffer Starting Address
10-0 Ch 1 System Memory Line Offset (in quadwords)
9-0
2-1
2-0
0
7HFKQRORJLHV ,QF
Y Direction (in pixels minus one)
(quadword aligned)
Reserved
Command List Operation Trigger
This bit is the same as bit-19 of register 2368h
(Channel 1 Read Enable).
command list operation and force bit-17 of register
2368h (Channel 1 Destination Select) to 1 (to select
the GE Command FIFO).
(quadword aligned)
Reserved
:H &
:H &R R QQHFW
QQHFW
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
It is used to trigger
-62
Port 2364 –Channel Arbitration Counter Threshold .... RW
Port 2368 – Graphics AGP Channel I/O Control .......... RW
31-28 Reserved
26-24 Channel 2 System Arbitration Threshold
23-20 Channel 2 System Arbitration Threshold
19-16 Channel 2 System Arbitration Threshold
15-12 Reserved
31-27 Reserved
23-22 Reserved
21-20 Reserved (Do not Program).....................must be 01
11-8 ??
15-1 Reserved
7-0
26
25
24
19
18
17
16
0
??
Reserved (Do not Program).......................must be 0
Reserved
Reserved (Do not Program).......................must be 0
Channel 1 Read Enable
Channel 1 Interrupt Enable
Channel 1 Destination Select
Channel 1 Enable
Channel 0 Enable
0
1
0
1
0
1
0
1
0
1
Graphics Accelerator PCI Bus Master Registers
Disable................................................... default
Enable
Disable................................................... default
Enable
Frame Buffer.......................................... default
GE Command FIFO
Disable................................................... default
Enable
Disable................................................... default
Enable
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................always reads 0
........................................ always reads 0
VT8601 Apollo ProMedia