Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-25. Overscan Values 1024 x 768 PAL-BDGHI, Pixel-Based Controller, 1-Pixel Resolution, >3 µs Hblank (2 of 3)
Graphics Controller
Total
Encoder Pixels
Overscan (Percent)
Active
Total
H_CLKI
1500
V_LINESI
1000
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Delta
240
239
238
245
244
250
243
249
254
242
248
253
247
257
261
252
256
260
240
259
263
240
229
240
247
229
240
247
229
235
253
1600
1608
1616
1568
1576
1536
1584
1544
1512
1592
1552
1520
1560
1496
1472
1528
1504
1480
1424
1488
1464
1616
1484
1408
1586
1456
1392
1612
1428
1394
1596
21.23
21.62
22.01
19.62
20.03
17.95
20.44
18.37
16.65
20.83
18.79
17.09
19.21
15.75
14.38
17.52
16.2
16.67
17.01
17.36
14.93
15.28
13.19
15.62
13.54
11.81
15.97
13.89
12.15
14.24
10.76
9.38
4.56
4.61
4.65
4.69
4.75
4.75
4.81
4.83
4.84
4.86
4.91
4.93
4.97
4.99
5.01
5.02
5.09
5.12
-5.17
5.23
5.23
5.34
-5.41
-6.18
6.3
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1335
1500
1500
1515
1325
1320
1525
1300
1305
1550
1275
1275
1575
1005
1010
980
985
960
990
965
945
995
970
950
975
935
920
955
12.5
940
11.11
9.72
925
14.84
11.5
1000
930
16.67
10.07
8.68
15.3
915
13.91
22.01
15.07
10.49
20.54
13.44
9.46
1000
1050
1000
975
16.67
20.49
16.67
14.24
20.49
16.67
14.24
20.49
18.4
1050
1000
975
-7.05
-7.21
7.58
-8.74
-8.81
8.88
21.82
11.74
9.59
1050
1025
950
21.03
12.15
A-50
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
