VT8601 Via, VT8601 Datasheet - Page 86

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

Graphics Video Display Registers
SR82-80 – Window 1 U-Plane FB Start Address ............ RW
SR85-83 – Window 1 V-Plane FB Start Address ............ RW
SR88-86 – Window 2 Frame Buffer Start Address ........ RW
SR8A-89 – Window 2 Horizontal Scaling Factor ........... RW
Revision 1.3 September 8, 1999
23-20 Reserved
23-20 Reserved
23-20 Reserved
14-13 W2 Tap
12-10 W2 Horizontal Minify Integer (Inverter)
19-0 W1 U-Plane FB Start Address
19-0 W1 V-Plane FB Start Address
19-0 Window 2 Frame Buffer Start Address
13-0 W2 Horizontal Zoom Factor
9-0
15
14
7HFKQRORJLHV ,QF
When operating in planar mode, this field defines the
frame buffer starting address for the U-plane for the
first live video window
When operating in planar mode, this field defines the
frame buffer starting address for the V-plane for the
first live video window
Frame buffer starting address for the second live
video window (packed YUV format only)
W2 Horizontal Minify / Zoom Select
Zoom Selected (Bit-15 = 0)
Reserved
Same format as for the first live video window as
defined in CR80 and CR81
Minify Selected (Bit-15 = 1)
W2 Horizontal Minify Factor
:H &
:H &R R QQHFW
0
1
QQHFW
Zoom .....................................................default
Minify
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
-80
SR8C-8B – Window 2 Vertical Scaling Factor .............. RW
SR90-8D – Window 2 Live Video Start .......................... RW
SR94-91 – Window 2 Live Video End ............................. RW
SR95 – Window 2 Live Video Line Buffer Level ........... RW
13-10 Reserved
31-28 Reserved
27-16 W2 Vertical Starting Point
15-12 Reserved
31-30 W2 Line Buffer Level Bits 8-7 (see SR95)
29-28 Reserved
27-16 W2 Vertical Ending Point
15-12 Reserved
13-0 W2 Vertical Zoom Factor
11-0 W2 Horizontal Starting Point
11-0 W2 Horizontal Ending Point
9-0
6-0
15
14
7
W2 Vertical Minify / Zoom Select
W2 Vertical Filtering
Zoom Selected (Bit-15 = 0)
Same format as for the first live video window as
defined in CR82 and CR83
Minify Selected (Bit-15 = 1)
W2 Vertical Minify Factor
Reserved
W2 Line Buffer Level Bits 6-0 (see SR91[31-30])
0
1
0
1
Zoom .................................................... default
Minify
Off
On
.................................................... default
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
........................................ always reads 0
VT8601 Apollo ProMedia
VGA Extended Registers