Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-15. Overscan Values 800 x 600 NTSC, Character Clocked-Based Controller, 9-Pixel Resolution, 3:2 Clocking
Mode (1 of 2)
Controller Pixels
Total
Encoder Pixels
Overscan (Percent)
Active
Total
H_CLKI
V_LINESI
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Delta
1170
1170
1170
1197
1197
1197
1197
1134
1134
1134
1134
1215
1125
1125
1125
1125
1125
1215
1125
1125
1125
1125
1125
1125
1125
1260
1260
1260
1260
1260
770
735
805
800
750
775
725
775
825
800
750
770
819
791
798
826
805
735
756
763
812
749
770
777
784
765
750
770
755
740
205
215
196
197
210
204
218
204
191
197
210
205
193
200
198
191
196
215
209
207
194
211
205
203
201
206
210
205
209
213
1144
1092
1196
1216
1140
1178
1102
1116
1188
1152
1080
1188
1170
1130
1140
1180
1150
1134
1080
1090
1160
1070
1100
1110
1120
1224
1200
1232
1208
1184
15.59
11.57
19.26
20.59
15.30
18.03
12.38
13.48
18.72
16.18
10.59
18.72
17.47
14.55
15.30
18.17
16.03
14.85
10.59
11.41
16.76
9.76
15.64
11.52
19.34
18.93
13.58
16.05
10.29
16.05
21.40
18.93
13.58
15.64
20.58
17.70
18.52
21.40
19.34
11.52
13.99
14.81
20.16
13.17
15.64
16.46
17.28
15.23
13.58
15.64
13.99
12.35
–0.04
0.05
–0.08
1.66
1.72
1.98
2.09
–2.57
–2.68
–2.75
–2.99
3.08
–3.11
–3.15
–3.22
–3.23
–3.31
3.33
–3.40
–3.40
–3.41
–3.41
–3.42
–3.45
–3.50
5.88
12.22
13.01
13.79
21.11
19.53
21.62
20.07
18.45
5.95
5.99
6.07
6.10
A-32
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
