Appendix A Scaling and I/0 Timing Register Calculations
CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Figure A-5. Allowable Overscan Compensation Ratios for Dual Display, 800x600 Input, NTSC Output in 3:2 Clocking
Mode
22
20
18
16
14
12
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):
1. All overscan solutions on this chart can be enabled by a data master that requires no more than 4 µs of MBlank time per line.
2. Use this chart for PAL-M and PAL-60 allowable overscan ratios.
A-8
Conexant
100381B