Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-5. Overscan Values, 640 x 480 NTSC, Character Clock-Based Controller, 8-Pixel Resolution, 2.5 µs HBlank
Controller Pixels
Total
Encoder Pixels
Active
Overscan (Percent)
Total
H_CLKI
V_LINESI
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Resolution
784
800
800
800
760
840
840
840
840
840
840
840
840
720
840
840
720
600
630
609
588
630
615
600
610
595
605
590
585
580
665
575
570
630
210
200
207
215
200
205
210
207
212
209
214
216
218
190
220
222
200
896
960
928
896
912
984
960
976
952
968
944
936
928
912
920
912
864
13.79
19.53
16.76
13.79
15.30
21.50
19.53
20.85
18.86
20.20
18.17
17.47
16.76
15.30
16.03
15.30
10.59
13.58
17.70
14.81
11.52
17.70
15.64
13.58
14.81
12.76
13.99
11.93
11.11
10.29
21.81
9.47
0.21
1.84
1.94
2.26
–2.40
5.86
5.95
6.04
6.10
6.21
6.23
6.36
6.47
–6.51
6.57
6.66
–7.10
8.64
17.70
A-14
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
