Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-7. Overscan Values, 640 x 480 PAL-BDGHI, Pixel-Based Controller, 1-Pixel Resolution, 2.5 µs HBlank (1 of 3)
Controller Pixels
Total
Encoder Pixels
Active
Overscan (Percent)
Total
H_CLKI
V_LINESI
V_ACTIVEO
H_CLKO
Horizontal
Vertical
Resolution
945
946
944
947
943
948
942
949
941
950
950
940
950
950
951
939
952
938
953
937
954
936
955
935
956
934
957
933
958
932
959
625
625
625
625
625
625
625
625
625
625
600
625
650
575
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
240
240
240
240
240
240
240
240
240
240
250
240
231
261
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
240
945
946
944
947
943
948
942
949
941
950
912
940
988
874
951
939
952
938
953
937
954
936
955
935
956
934
957
933
958
932
959
16.65
16.73
16.56
16.82
16.47
16.91
16.38
17.00
16.29
17.09
13.63
16.20
20.27
9.88
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
13.19
16.67
19.79
9.38
–0.02
0.07
–0.11
0.16
–0.20
0.24
–0.29
0.33
–0.37
0.42
0.44
–0.46
0.48
0.50
17.17
16.11
17.26
16.02
17.35
15.93
17.43
15.84
17.52
15.75
17.61
15.66
17.69
15.57
17.78
15.48
17.86
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
16.67
0.51
–0.55
0.59
–0.64
0.68
–0.73
0.77
–0.82
0.85
–0.91
0.94
–1.00
1.02
–1.09
1.11
–1.18
1.20
A-16
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
