Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-23. Overscan Values 1024 x 768 NTSC, Character Clock-Based Controller, 8-Pixel Resolution, >1.50 µs HBlank
Controller Pixels
Total
Encoder Pixels
Overscan (Percent)
Active
Total
H_CLKI
V_LINESI
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Delta
1176
1176
1160
1152
1200
1200
1200
1200
1200
1200
1240
1280
1320
1176
1176
1160
1152
1200
1200
1200
1200
1200
1200
1128
1240
1280
1050
975
192
207
214
192
196
200
209
205
214
219
214
214
214
192
207
214
192
196
200
209
205
214
219
192
214
214
1568
1456
1392
1536
1568
1536
1472
1504
1440
1408
1488
1536
1584
1568
1456
1392
1536
1568
1536
1472
1504
1440
1408
1504
1488
1536
21.18
15.11
11.21
19.53
21.18
19.53
16.03
17.82
14.17
12.22
16.94
19.53
21.97
21.18
15.11
11.21
19.53
21.18
19.53
16.03
17.82
14.17
12.22
17.82
16.94
19.53
20.99
14.81
11.93
20.99
19.34
17.70
13.99
15.64
11.93
9.88
0.19
0.30
–0.73
–1.45
1.83
1.84
2.04
2.18
2.23
2.34
5.00
7.60
10.04
0.19
0.30
–0.73
–1.45
1.83
1.84
2.04
2.18
2.23
2.34
–3.17
5.00
7.60
945
1050
1029
1008
966
987
945
924
945
11.93
11.93
11.93
20.99
14.81
11.93
20.99
19.34
17.70
13.99
15.64
11.93
9.88
945
945
1050
975
945
1050
1029
1008
966
987
945
924
1050
945
20.99
11.93
11.93
945
A-46
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
