1.0 Functional Description
CX25870/871
1.3 Device Description
Flicker-Free Video Encoder with Ultrascale Technology
Figure 1-30. SECAM High Frequency Pre-emphasis Filter
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14
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8
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2
0
3.5
4
4.5
5
Frequency in MHz
100381_051
1.3.37 Color Bar and Blue Field Generation
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: FFCBAR color bars are optimized for RGB input mode and ECBAR color
bars are optimized for YCrCb input mode.
The device uses the H_BLANKO register value to determine the starting point
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.
The CX25870/871 also produces a blue field by setting register bit EBLUE
to 1. Pixel inputs are ignored while any of the color generation wave forms are
being produced.
1-62
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
