SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 329

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

Revision 3.0
Video Processor Module
Mixing/Blending Operation
Table 6-2 on page 329 shows the truth table used to create
the flow diagram, Figure 6-12 on page 330, that the
1.
2.
CHROMA_SEL
CHROMA_SEL
CHROMA_SEL
Graphics Color
Video Chroma
COLOR_CHROMA_SEL: F4BAR0+Memory Offset 04h[20].
GFX_INS_VIDEO: F4BAR0+Memory Offset 4Ch[8].
ALPHAx_COLOR_REG_EN: F4BAR0+Memory Offsets 68h[24], 78h[24], and 88h[24].
(COLOR_
(COLOR_
COLOR_
Key
= 0)
Key
= 1)
x
x
1
Not in an Alpha
Not in an Alpha
Not in Video
Inside Alpha
Inside Alpha
Windows
Window x
Window x
Window
Window
Window
x
(Continued)
ALPHAx_COLOR_REG_EN = 1
ALPHAx_COLOR_REG_EN = 0
ALPHAx_COLOR_REG_EN = 1
ALPHAx_COLOR_REG_EN = 0
Table 6-2. Truth Table for Alpha Blending
GFX_INS_VIDEO = 0
GFX_INS_VIDEO = 1
GFX_INS_VIDEO = 0
GFX_INS_VIDEO = 1
Configuration
x
x
x
x
2
329
Mixer/Blender logic uses to determine each pixels disposi-
tion.
Data Match
Color Key
Graphics
Cursor
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
Data Match
Color Key
Graphics
Normal
Yes
Yes
Yes
No
No
x
x
x
x
x
x
x
x
x
Video Data
Color Key
Normal
Match
Yes
Yes
Yes
No
No
x
x
x
x
x
x
x
x
x
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Graphics Data
Graphics Data
Color Register
Alpha-blended
Graphics Data
Graphics Data
Color Register
Graphics Data
Alpha-blended
Mixer Output
Cursor Color
Video Data
Video Data
Video Data
Video Data
Color from
Color from
Data
Data