AMD Geode SC1201 - Manual (Page 323)

AMD Geode™ SC1200/SC1201 Processor Data Book 323
Video Processor Module 32579B
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 can be performed in either
the YUV or RGB format. The YUV to RGB CSC (see Sec-
tion 7.2.3.1) is used on the video data when RGB mixing/
blending is desired and the RGB to YUV CSC is used on
the graphics data when YUV blending is desired. 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.
Figure 7-10. Mixer/Blender Block Diagram
01
10
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
0 1
/GV_GAMMA_SEL * /GAMMA_EN
GV_GAMMA_SEL * /GAMMA_EN GV_GAMMA_SEL
CSC_FOR_VIDEO
0 1
01
CSC
RGB to
YUV
10
YUV or RGB
Cursor Color Key
01
COLOR_CHROMA_SEL
Color/Chroma Key
GRAPHICS
Compare
Compare
RGB
YUV Data
TVOUT Block