Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-22. Overscan Values 1024 x 768 NTSC, Pixel-Based Controller, 1-Pixel Resolution, >1.50 µs. Hblank (3 of 4)
Graphics Controller
Total
Encoder Pixels
Overscan (Percent)
Active
Total
H_CLKI
V_LINESI
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Delta
1210
1215
1215
1218
1215
1125
1125
1125
1225
1125
1125
1125
1225
1125
1220
1225
1225
1225
1225
1225
1225
1225
1225
1225
1225
1230
1239
1235
1240
1245
1250
945
1015
980
975
945
987
973
959
1008
994
980
966
999
952
945
990
1017
981
972
963
954
918
945
927
936
945
975
945
945
945
945
214
199
206
207
214
205
208
211
200
203
206
209
202
212
214
204
199
206
208
210
212
220
214
218
216
214
207
214
214
214
214
1452
1566
1512
1508
1458
1410
1390
1370
1568
1420
1400
1380
1554
1360
1464
1540
1582
1526
1512
1498
1484
1428
1470
1442
1456
1476
1534
1482
1488
1494
1500
14.88
21.07
18.26
18.04
15.23
12.34
11.08
9.78
11.93
18.11
15.23
14.81
11.93
15.64
14.4
2.94
2.97
3.03
3.22
3.29
-3.3
-3.32
-3.39
3.48
-3.5
-3.51
-3.56
3.59
-3.64
3.64
3.69
3.77
3.78
3.85
3.91
3.96
3.98
3.99
4
13.17
17.7
21.18
12.96
11.72
10.44
20.47
9.12
16.46
15.23
13.99
16.87
12.76
11.93
16.05
18.11
15.23
14.4
15.58
19.74
21.87
19.01
18.26
17.49
16.71
13.45
15.92
14.29
15.11
16.26
19.43
16.6
13.58
12.76
9.47
11.93
10.29
11.11
11.93
14.81
11.93
11.93
11.93
11.93
4
4.33
4.61
4.67
5
16.94
17.27
17.6
5.34
5.67
A-44
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
