Allwinner A20 - Page 338

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 338 / 812
Offset:
Out channel 0:0x100
Out channel 1:0x104
Out channel 2:0x108
Register Name: MP_OUTLINEWIDTH_REG
Bit
Read/W
rite
Default/He
x
Description
Line width in bits
3.1.4.32. OUTPUT ALPHA CONTROL REGISTER
Offset: 0x120
Register Name: MP_OUTALPHACTL_REG
Bit
Read/W
rite
Default/He
x
Description
31:24
R/W
0
IMG_ALPHA
Output image area alpha value, the image area include A0,A1
and overlapping area A2.
23:16
R/W
0
NONIMG_ALPHA
Output non-image area alpha value, the non-image area
means the pure fill color area.
15:8
/
/
/
7:6
R/W
0
A2ALPHACTL
A2 area alpha value control
0: using A0 self pixel alpha (A0pA)
1: using A1 self pixel alpha (A1pA)
2: the alpha value = A0pA + A1pA * ( 1 - A0pA )
3: using the Output image area alpha value (bit31:24)
5:4
R/W
0
A3ALPHACTL
A3 area alpha value control
0: 0xff
1: using the Output non-image area alpha value (bit23:16)
Other: reserved
3:2
R/W
0
A1ALPHACTL
A1 area alpha value control
0: using A1 self pixel alpha
1: using the Output image area alpha value (bit31:24)
Other: reserved
1:0
R/W
0
A0ALPHACTL