cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 201

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table A-8. Overscan Values, 640 x 480 PAL-BDGHI, Character Clock-Based Controller, 8-Pixel Resolution, 2.5 µs HBlank
100381B
H_CLKI
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1008
944
952
936
960
928
968
920
976
912
984
904
992
896
888
880
872
Controller Pixels
Total
V_LINESI
625
625
625
625
625
625
625
625
625
625
625
625
625
625
620
615
610
605
600
630
575
580
585
590
595
625
625
625
625
V_ACTIVEO
Active
240
240
240
240
240
240
240
240
240
240
240
240
240
240
242
244
246
248
250
239
261
259
257
255
253
240
240
240
240
Encoder Pixels
Conexant
H_CLKO
1000
1008
1008
Total
944
952
936
960
928
968
920
976
912
984
904
992
896
992
984
976
968
960
920
928
936
944
952
888
880
872
Appendix A Scaling and I/0 Timing Register Calculations
Horizontal
16.56
17.26
15.84
17.95
15.12
18.63
14.38
19.29
13.63
19.95
12.87
20.60
21.23
12.09
20.60
19.95
19.29
18.63
17.95
21.86
14.38
15.12
15.84
16.56
17.26
21.86
11.30
10.49
9.67
Overscan (Percent)
Vertical
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
15.97
15.28
14.58
13.89
13.19
17.01
10.07
10.76
11.46
12.15
16.67
16.67
16.67
16.67
9.38
Resolution
–0.11
–0.82
–1.55
–2.29
–3.04
–3.80
–4.58
–5.37
–6.18
–7.00
0.59
1.28
1.96
2.63
3.28
3.93
4.56
4.62
4.67
4.71
4.74
4.75
4.84
5.01
5.05
5.08
5.10
5.11
5.19
A-19