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Revision 3.0

Video Processor Module (Continued)

6.2.3

Mixer/Blender Block

The Mixer/Blender block of the Video Processor module

performs all the necessary functions to properly mix/blend

the video data and the graphics data. These functions

include Color Space Conversion (CSC), optional Gamma

correction, color/chroma key, and the mixing/blending logic.

See Figure 6-10 for block diagram of the Mixer/Blender

Block.

Video/Graphics mixing/blending must be performed in the

RGB format. The YUV to RGB CSC (Section 6.2.3.1 on

page 327) must be used on the video data if it is in YUV for-

mat. If Gamma Correction (see Section 6.2.3.2) on the

video data is desired, it must be done in the color space of

the input video data, which can be either YUV or RGB. If

Gamma Correction on the graphics data is desired, it must

be done in the color space of the input graphics data, which

is RGB.

The video data can be in progressive or interlaced format,

while the graphics data is always in the progressive format.

The Mixer/Blender can mix/blend either format of video

data with graphics data. F4BAR0+Memory Offset 4Ch[9]

programs the mix/blend format. Considering the color

space and the data format, the Mixer/Blender supports five

types of mixing/blending. Some of the mixing/blending

types have additional programming considerations to

enable them to work optimally. The valid mixing/blending

configurations are listed in see Table 6-1 on page 327

along with any additional programming requirements.

Figure 6-10. Mixer/Blender Block Diagram

Video, 4:4:4

Graphics,

Optional

Gamma

Correction

RAM

CSC

YUV to

RGB

Color/Chroma

Key and

Mixer/Blender

CRT DACs and

TFT Interface

/G_V_GAMMA * GAMMA_EN

G_V_GAMMA * GAMMA_EN

G_V_GAMMA

CSC_FOR_VIDEO

YUV or RGB

Cursor Color Key

COLOR_CHROMA_SEL

Color/Chroma Key

Compare

RGB

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