Allwinner A20 - Page 540

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 540 / 812
DE-LAYER ATTRIBUTE CONTROL REGISTER0
Offset:
Layer0: 0x890
Layer1: 0x894
Layer2: 0x898
Layer3: 0x89C
Register Name: DEBE_ATTCTL_REG0
Bit
Read/W
rite
Default/
Hex
Description
31:24
R/W
UDF
LAY_GLBALPHA
Alpha value
Alpha value is used for this layer
23:22
R/W
UDF
LAY_WORKMOD
Layer working mode selection
00: normal mode (Non-Index mode)
01: palette mode (Index mode)
10: internal frame buffer mode
11: gamma correction
Except the normal mode, if the other working mode is selected,
the on chip SRAM will be enabled.
21:20
/
/
/
19:18
R/W
UDF
CKEN
Color key Mode
00: disabled color key
01: The layer color key match another channel pixel data in
Alpha Blender1.
1x: Reserved
Only 2 channels pixel data can get to Alpha Blender1 at the
same screen coordinate.
17:16
/
/
/
15
R/W
UDF
LAY_PIPESEL
Pipe Select
0: select Pipe 0
1: select Pipe 1
14:12
/
/
/
11:10
R/W
UDF
LAY_PRISEL
Priority