VT1621M VIA, VT1621M Datasheet - Page 17

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

Offset 20 – TV Sync Step ................................................. RW
Offset 21 – TV Burst Envelope Step ............................... RW
Offset 22 – TV Sub-Carrier Phase Adjustment ............. RW
Offset 23 –TV Blank Level............................................... RW
Offset 24 – TV Signal Overflow ...................................... RW
Offset 4A – Input Aperture Threshold ........................... RW
Offset 4B - Input Aperture Delta ................................... RW
Offset 4C – Aperture Upper Threshold.......................... RW
Offset 4D – Aperture Lower Threshold.......................... RW
Offset 4E – Aperture Mode ............................................. RW
Revision 1.0 June 17, 2002
7-0
7-0
7-0
7-0
7-6
4-2
7-0
7-0
7-0
7-0
6-0
5
1
0
7
TV Sync Step ........................................ default = 00h
Step value to control the shape / slope of the sync.
The msb is defined in TV signal overflow register
Rx24[0].
TV Burst Envelope Step ...................... default = 00h
Step value to control the shape / slope of the burst.
The msb is defined in TV signal overflow register
Rx24[1].
TV Sub-Carrier Phase Adjustment .... default = 00h
Step value to control the shape / slope of the burst.
The msbs are defined in TV signal overflow register
Rx24[4-2].
TV Blank Level ..................................... default = 00h
Step value to control the base level of the blank
signal. The msb is defined in TV signal overflow
register Rx24[5].
Reserved
Bit[8] of TV Blank Level .......................... default = 0
Bit[10:8] of Sub-Carrier Phase Adjustment
Bit[8] of TV Burst Envelope Step ........... default = 0
Bit[8] of TV Sync Step (Rx20) ................. default = 0
Input Data Threshold ........................... default = 00h
Input Data Adjustment Value ............. default = 00h
Text Enhancement Upper Threshold .. default = 00h
Text Enhancement Lower Threshold . default = 00h
Aperture Mode
Adjustment Delta ...................................... default = 0
We Connect
We Connect
We Connect
We Connect
0
1
Normal................................................... default
Inverse
........................................ always reads 0
.............................................. default = 0
- 12-
Offset 4F – Coring Function ............................................ RW
Offset 50 – Y Delay Control ............................................. RW
Offset 51 – UV Delay Control .......................................... RW
Offset 52 – Burst Maximum Amplitude .......................... RW
6-0
7-3
2-0
6-4
2-0
7-0
7
7
3
Coring Function
Coring Function Threshold .....................default = 0
Reserved ..............................................always reads 0
Y Delay Depth ..........................................default = 0
Burst Maximum Amplitude Bit-8 (see Rx52) .def=0
U Delay Depth ...........................................default = 0
Y, Cb, Cr Underflow Check
V Delay Depth ...........................................default = 0
Burst Maximum Value (see Rx51[7]) ......default = 0
0
1
0
1
Disable ...................................................default
Enable
Disable ...................................................default
Enable
VT1621 / VT1621M TV Encoder
Register Descriptions