VT1621M VIA, VT1621M Datasheet - Page 12

• Manufacturer Part Number: VT1621M
• Description: TV Encoder
• Manufacturer: VIA

Register Descriptions
Offset 00 – Input Frame Format ..................................... RW
Revision 1.0 June 17, 2002
7-5
3-0
4
Frame Resolution
* 101 720x576 (for PAL)
* 101 720x480 (for NTSC)
* 110 800x500 (for PAL)
* 110 640x400 (for NTSC)
* interlaced input mode
RGB Pass through Mode
Input Data Format
00xx -reserved-................................. default = 0000b
0100 12-bit multiplexed RGB (24-bit color) input
0101 12-bit multiplexed RGB (24-bit color) input
0110 8-bit multiplexed RGB (24-bit color) input
0111 8-bit multiplexed RGB (16-bit color) input
1000 8-bit multiplexed RGB (15-bit color) input
1001 8-bit multiplexed YCrCb (Normal) input (Y,
101x 8-bit multiplexed YCrCb (Cr and Cb shift 128)
110x 8-bit multiplexed YCrCb (Y shift 16) input (Y,
111x 8-bit multiplexed YCrCb (Y shift 16 and Cr
We Connect
We Connect
We Connect
We Connect
000 512x384................................................. default
001 720x400
010 640x400
011 640x480
100 800x600
111 -reserved-
0
1
Disable................................................... default
Enable
(“C” multiplex scheme)
(“I” multiplex scheme)
Cr and Cb multiplexed)
input (Y, Cr and Cb multiplexed)
Cr and Cb multiplexed)
and Cb shift 128) input (Y, Cr and Cb
multiplexed)
- 7-
Offset 01 – Input Sync Format......................................... RW
7
6
5
4
3
2
1
0
Reserved
Field Signal Polarity
DS_BCO Pin Control
Detect Embedded Sync
Vertical Sync Direction
Horizontal Sync Direction
Vertical Sync Polarity
Horizontal Sync Polarity
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Active Low ............................................default
Active High
BCO Output ...........................................default
DS Input
Don’t detect............................................default
Sync will be detected from the embedded
codes on the pixel input stream
Input ....................................................default
Output
Input ....................................................default
Output
Active Low ............................................default
Active High
Active Low ............................................default
Active High
VT1621 / VT1621M TV Encoder
........................................always reads 0
Register Descriptions