SC3200 datasheet(338/447 Pages) AMD

338 / 447 page

338

AMD Geode™ SC3200 Processor Data Book

Video Processor Module

Revision 5.1

7.2.3

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 7-10 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 7.2.3.1 on

page 339) must be used on the video data if it is in YUV

format. There is not a post mix/blend YUV to RGB CSC to

support the TFT output. If Gamma Correction (see Section

7.2.3.2) 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 7-1 on page 339

along with any additional programming requirements.

Figure 7-10. Mixer/Blender Block Diagram

Video, 4:4:4

Graphics,

CSC_FOR_

Optional

Gamma

Correction

RAM

CSC

YUV to

RGB

Color/Chroma

Key and

Mixer/Blender

CRT DACs and

TFT Interface

1/2 Y

Flicker

Filter

FLICKER_FILT_CNTRL = 01

/GV_GAMMA_SEL * /GAMMA_EN

GV_GAMMA_SEL * /GAMMA_EN

GV_GAMMA_SEL

CSC_FOR_VIDEO

CSC

RGB to

YUV

YUV or RGB

Cursor Color Key

COLOR_CHROMA_SEL

Color/Chroma Key

GRAPHICS

Compare

RGB

YUV Data

TVOUT Block

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