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Preliminary
S3C2451X RISC MICROPROCESSOR
2D
19-31
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
ROP & Alpha Setting
RASTER OPERATION REGISTER (ROP_REG)
Register Address
R/W
Description
Reset
Value
ROP_REG 0x4D408410
R/W
Raster Operation Register
0x0
Field
Bit
Description
Initial State
Reserved [31:14]
0x0
OS
[13]
Third Operand Select :
1’b0 : Pattern
1’b1 : Foreground Color
0x0
ABM
[12:10]
Alpha Mode :
3’b000 : No Alpha Blending
3’b001 : Perpixel Alpha Blending with Source Bitmap
3’b010 : Alpha Blending with Alpha Register
3’b100 : Fading
Others : Reserved
Note that Perpixel Alpha Blending can only be applied on bit block
transfer.
0x0
T
[9]
0 : Opaque Mode
1 : Transparent Mode
0x0
B
[8]
0: Blue-screen Mode Disable
1: Blue-screen Mode Enable
Note that T and B must not be set at the same time.
0x0
ROP Value
[7:0]
Raster Operation Value
0x0
ALPHA REGISTER (ALPHA_REG)
Register Address
R/W
Description
Reset
Value
ALPHA_REG 0x4D408420
R/W
Alpha
Register
0x0
Field
Bit
Description
Initial State
Reserved [31:16]
0x0
Fading
[15:8]
Fading Offset Value
0x0
Alpha [7:0]
Alpha
Value
0x0