SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 326

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

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YUV or RGB
Video Processor Module
6.2.3
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.
Video, 4:4:4
G_V_GAMMA
Graphics,
RGB
Mixer/Blender Block
G_V_GAMMA * GAMMA_EN
0
1
COLOR_CHROMA_SEL
/G_V_GAMMA * GAMMA_EN
Correction
(Continued)
Optional
Gamma
Figure 6-10. Mixer/Blender Block Diagram
RAM
Color/Chroma Key
Cursor Color Key
326
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.
YUV to
RGB
CSC
Compare
Compare
CSC_FOR_VIDEO
Color/Chroma
Mixer/Blender
Key and
CRT DACs and
TFT Interface
Revision 3.0