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