CX25870 Datasheet, PDF (202/291 Pages) Conexant Systems, Inc – Video Encoder with Adaptive Flicker Filtering and HDTV Output

Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-9. Overscan Values, 640 x 480 PAL-BDGHI, Character Clock-Based Controller, 9-Pixel Resolution, 2.5 µs HBlank
Controller Pixels
Total
Encoder Pixels
Active
Total
Overscan (Percent)
H_CLKI
V_LINESI
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Resolution
945
625
240
954
625
240
936
625
240
963
625
240
927
625
240
972
625
240
918
625
240
981
625
240
909
625
240
990
625
240
900
650
231
900
625
240
999
625
240
891
625
240
1008
625
240
882
625
240
873
625
240
945
954
936
963
927
972
918
981
909
990
936
900
999
891
1008
882
873
16.65
17.43
15.84
18.20
15.03
18.96
14.19
19.71
13.35
20.44
15.84
12.48
21.15
11.59
21.86
10.69
9.77
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
19.79
16.67
16.67
16.67
16.67
16.67
16.67
–0.02
0.77
–0.82
1.54
–1.64
2.30
–2.47
3.04
–3.32
3.77
–3.95
–4.19
4.49
–5.07
5.19
–5.97
–6.89
A-20
Conexant
100381B