cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 78

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

1.0 Functional Description
1.3 Device Description
1.3.37 Color Bar and Blue Field Generation
1-62
Figure 1-30. SECAM High Frequency Pre-emphasis Filter
The CX25870/871 has two internal color bar generators. Preflicker filter color
bars are enabled by setting the FFCBAR bit to a logical 1. Postflicker filter color
bars are enabled by setting the ECBAR bit to a logical 1.
NOTE:
of the color bars, and the H_ACTIVE register value to determine the width. Eight
bars are displayed, with the colors and amplitudes being generated internally. The
pixel inputs (P23–P0) are ignored in color bar mode. The CX25870/871 must be
programmed with the appropriate MY, MCR, and MCB register values for the
desired input format, RGB or YCrCb.
to 1. Pixel inputs are ignored while any of the color generation wave forms are
being produced.
The device uses the H_BLANKO register value to determine the starting point
The CX25870/871 also produces a blue field by setting register bit EBLUE
16
14
12
10
8
6
4
2
0
3.5
FFCBAR color bars are optimized for RGB input mode and ECBAR color
bars are optimized for YCrCb input mode.
4
Conexant
Frequency in MHz
Flicker-Free Video Encoder with Ultrascale Technology
4.5
5
100381_051
CX25870/871
100381B