Video Processor Module

32579B

Mixing/Blending Operation

Table 7-3 on page 327 shows the truth table used to create the flow diagram, Figure 7-12 on page 328, that the Mixer/ Blender logic uses to determine each pixels disposition.

Table 7-3. Truth Table for Alpha Blending

 

 

 

Graphics

Graphics

Video Data

 

COLOR_

 

 

Data Match

Data Match

Match

 

 

 

Cursor

Normal

Normal

 

CHROMA_SEL1

 

Configuration2

 

Windows

Color Key

Color Key

Color Key

Mixer Output

x

x

x

Yes

x

x

Cursor Color

 

 

 

 

 

 

 

x

Not in Video

x

No

x

x

Graphics Data

 

Window

 

 

 

 

 

 

 

 

 

 

 

 

Graphics Color

Not in an Alpha

GFX_INS_VIDEO = 0

No

Yes

x

Video Data

Key

Window

 

 

 

 

 

 

No

No

x

Graphics Data

 

 

 

(COLOR_

 

 

 

 

 

 

 

GFX_INS_VIDEO = 1

No

x

x

Video Data

CHROMA_SEL

 

 

 

 

 

 

Inside Alpha

ALPHAx_COLOR_REG_EN = 1

No

Yes

x

Color from

= 0)

Window x

 

 

 

 

Color Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALPHAx_COLOR_REG_EN = 0

No

Yes

x

Video Data

 

 

 

 

 

 

 

 

 

x

No

No

x

Alpha-blended

 

 

 

 

 

 

Data

 

 

 

 

 

 

 

Video Chroma

Not in an Alpha

GFX_INS_VIDEO = 0

No

x

Yes

Graphics Data

Key

Window

 

 

 

 

 

 

No

x

No

Video Data

 

 

 

(COLOR_

 

 

 

 

 

 

 

GFX_INS_VIDEO = 1

No

x

x

Graphics Data

CHROMA_SEL

 

 

 

 

 

 

Inside Alpha

ALPHAx_COLOR_REG_EN = 1

No

x

Yes

Color from

= 1)

Window x

 

 

 

 

Color Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALPHAx_COLOR_REG_EN = 0

No

x

Yes

Graphics Data

 

 

 

 

 

 

 

 

 

x

No

x

No

Alpha-blended

 

 

 

 

 

 

Data

 

 

 

 

 

 

 

1.COLOR_CHROMA_SEL: F4BAR0+Memory Offset 04h[20].

2.GFX_INS_VIDEO: F4BAR0+Memory Offset 4Ch[8].

ALPHAx_COLOR_REG_EN: F4BAR0+Memory Offsets 68h[24], 78h[24], and 88h[24].

AMD Geode™ SC1200/SC1201 Processor Data Book

327

Page 327
Image 327
AMD SC1201, SC1200 manual Truth Table for Alpha Blending, Mixing/Blending Operation, Color, CHROMASEL1