VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-103
VGA Extended Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
CRA1-A0 – Capture Vertical Total .................................RW
15-11 Reserved
........................................ always reads 0
10-0 Capture Vertical Total
CRA3-A2 – Capture Horizontal Total ............................RW
15-9 Reserved
........................................ always reads 0
8-0
Capture Horizontal Total
CRA5-A4 – Capture Vertical Start .................................RW
15-11 Reserved
........................................ always reads 0
10-0 Capture Vertical Start
CRA7-A6 – Capture Vertical End ...................................RW
15-11 Reserved
........................................ always reads 0
10-0 Capture Vertical End
CRA9-A8 – Capture Horizontal Start.............................RW
15-10 Reserved
........................................ always reads 0
9-0
Capture Horizontal Start
CRAB-AA – Capture Horizontal End.............................RW
15-10 Reserved
........................................ always reads 0
9-0
Capture Horizontal End
CRAC – Capture Vertical Sync Pulse Width .................RW
7-4
Reserved
........................................ always reads 0
3-0
Capture Vertical Sync Pulse Width
CRAD – Capture Horizontal Sync Pulse Width.............RW
7-6
Reserved
........................................ always reads 0
5-0
Capture Horizontal Sync Pulse Width
CRAE – Capture CRTC Control .................................... RW
7Time Base
0
One Time Base ...................................... default
1Two Time Base
6Frame Reset
0
Field reset .............................................. default
1
Frame reset
5
Capture Clock Divide by 2
0
Select original capture clock.................. default
1
Select inverted capture clock before divide by
two
4
Odd / Even Field Invert
0
Normal ................................................... default
1
Invert
3
CRTC Hsync Load
0
Enable .................................................... default
1
Disable
2
CRTC Vsync Load
0
Enable .................................................... default
1
Disable
1
CRTC Horizontal Reset
0
Enable .................................................... default
1
Disable
0
CRTC Vertical Reset
0
Enable .................................................... default
1
Disable
CRAF – Capture CRTC Control .................................... RW
7
Video Exist Select
0
Video exist capture ................................ default
1
Always capture
6
Capture Sync and Direct
0
Input .................................................... default
1Output
5
Reserved
........................................ always reads 0
4
Capture CRTC Input Clock Mode
0
Normal ................................................... default
1
Clock divided by 2 when in 8-bit pixel bus
mode
3
External CRTC Input Clock Mode
0
Clock devided by 1 ................................ default
1
Clock devided by 2
2
External Pixel Clock Mode
0
Clock devided by 1 ................................ default
1
Clock devided by 2
1
CRTC Mode
0
Targa Mode ........................................... default
1
XPCV Mode
0
MPEG2 Vsync Select
0
Original Vsync....................................... default
1
Field ID
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