VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-99
VGA Extended Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
CR81-80 – Window 1 Horizontal Scaling Factor ...........RW
15
Horizontal Minify / Zoom Enable
0
Horizontal Zoom Enable ........................default
1
Horizontal Minify Enable
Minify Enabled:
14-13 Tap 1
12-10 Horizontal Minify Integer (Inverter), Hsrc/Hdst – 1
9-0
Horizontal Minify Factor, (Hdst/Hsrc) * 1024
Zoom Enabled:
13-0 Horizontal Zoom Factor, (Hdst/(Hsrc-2)-1) * 1024
CR83-82 – Window 1 Vertical Scaling Factor................RW
15
Vertical Minify / Zoom Enable
0
Vertical Zoom Enable ............................default
1
Vertical Minify Enable
14
Vertical Filtering
0
Disable ...................................................default
1Enable
13-10 Reserved
........................................ always reads 0
9-0
Vertical Minify / Zoom Factor (Vdst/Vsrc) * 1024
CR89-86 – Window 1 Video Window Start.................... RW
31-28 Reserved
........................................ always reads 0
27-16 Video Window Vertical Start
In pixel delays from the edge of VSYNC
15-12 Reserved
........................................ always reads 0
11-0 Video Window Horontal Start
In pixel delays from the rising edge of HSYNC
CR8D-8A – Video Window End ...................................... RW
31-28 Reserved
........................................ always reads 0
27-16 Video Window Vertical End
In pixel delays from the edge of VSYNC
15-12 Reserved
........................................ always reads 0
11-0 Video Window Horontal End
In pixel delays from the rising edge of HSYNC
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