Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Figure A-3. Allowable Overscan Compensation Ratios for Dual Display, 800x600 Input, NTSC Output
Overscan Compensation Percentage Pairs for 800x600 NTSC
24
3 µs
22
20
2 µs
18
16
1 µs
14
.75 µs
12
0 µs Horizontal Blanking
10
8
8
10
12
14
16
18
20
22
Vertical Overscan Compensation Percentage
Legend:
= Pixel Clock Solution
= 8-Cycle Character Clock Solution
= 9-Cycle Character Clock Solution
NOTE(S):
Use this chart for PAL-M and PAL-60 allowable overscan ratios.
100381_028
A-6
Conexant
100381B