VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-63
Graphics Accelerator PCI Bus Master Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
Port 236C – Graphics AGP Global & Chan 2 Control ..RW
31-26 Reserved
........................................ always reads 0
25-24 Sideband Address (SBA) Standby Latency Timer
23
High Priority Command Enable
0
Disable ...................................................default
1Enable
22
Long Read Command Enable
0
Disable ...................................................default
1Enable
21
System Side Channel 2 Priority
20
System Side Channel 1 Priority
19
System Side Channel 0 Priority
18
Reserved
........................................ always reads 0
17
Frame Buffer Channel 2 Priority
16
Frame Buffer Channel 1 Priority
15-5 Reserved
........................................ always reads 0
4-3
Channel 2 Read Operation Select
00 Disabled .................................................default
01 Read from Frame Buffer to AGP
10 Write from AGP to Capture / MPEG / FB
11 -reserved-
2
Channel 2 Interrupt Enable
0
Disable ...................................................default
1Enable
1-0
Channel 2 Write Target Select
00 Write to Frame Buffer ............................default
01 Write to Capture / MPEG / FB
1x -reserved-
Port 2370 –AGP Status..................................................... RW
31-18 Reserved
........................................ always reads 0
17
Channel 2 Interrupt Status
0
No interrupt pending.............................. default
1
Interrupt Pending
16
Channel 2 Busy Status
0
Idle
.................................................... default
1Busy
15-10 Reserved
........................................ always reads 0
9
Channel 1 Interrupt Status
0
No interrupt pending.............................. default
1
Interrupt Pending
8
Channel 1 Busy Status
0
Idle
.................................................... default
1Busy
7-2
Reserved
........................................ always reads 0
1
Channel 0 Interrupt Status
0
No interrupt pending.............................. default
1
Interrupt Pending
0
Channel 0 Busy Status
0
Idle
.................................................... default
1Busy
Graphics AGP Configuration Registers
Port 2380 – Graphics AGP Capability Identifier........... RW
31-0 xx
Port 2384 – Graphics AGP Status ................................... RW
31-0 xx
Port 2388 – Graphics AGP Command ............................ RW
31-0 xx
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