Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-13. Overscan Values 800 x 600 NTSC, Pixel-Based Controller, 1-Pixel Resolution, 3:2 Clocking Mode (2 of 4)
Controller Pixels
Total
Encoder Pixels
Overscan (Percent)
Active
Total
H_CLKI
V_LINESI
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Delta
1134
1134
1134
1134
1215
1125
1125
1218
1125
1125
1125
1215
1125
1125
1125
1125
1125
1125
1125
1225
1120
1225
1225
1225
1225
1225
1225
1225
1120
1225
775
825
800
750
770
819
791
750
798
826
805
735
756
763
812
749
770
777
784
792
810
765
747
774
783
756
720
738
765
729
204
191
197
210
205
193
200
210
198
191
196
215
209
207
194
211
205
203
201
199
195
206
211
204
202
209
219
214
206
217
1116
1188
1152
1080
1188
1170
1130
1160
1140
1180
1150
1134
1080
1090
1160
1070
1100
1110
1120
1232
1152
1190
1162
1204
1218
1176
1120
1148
1088
1134
13.48
18.72
16.18
10.59
18.72
17.47
14.55
16.76
15.30
18.17
16.03
14.85
10.59
11.41
16.76
9.76
16.05
21.40
18.93
13.58
15.64
20.58
17.70
13.58
18.52
21.40
19.34
11.52
13.99
14.81
20.16
13.17
15.64
16.46
17.28
18.11
19.75
15.23
13.17
16.05
16.87
13.99
9.88
–2.57
–2.68
–2.75
–2.99
3.08
–3.11
–3.15
3.18
–3.22
–3.23
–3.31
3.33
–3.40
–3.40
–3.41
–3.41
–3.42
–3.45
–3.50
3.52
12.22
13.01
13.79
21.62
16.18
18.86
16.90
19.80
20.72
17.89
13.79
15.89
11.25
14.85
–3.57
3.63
3.73
3.75
3.85
3.90
3.91
11.93
15.23
10.70
3.95
–3.98
4.15
A-28
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
