Allwinner A20 - Page 332

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Offset: 0xC0
Register Name: MP_ALPHACKCTL_REG
Bit
Read/W
rite
Default/
Hex
Description
Red control condition
0: if (R value of ck min color) <= (R value of layer0) <= (R value
of ck max color),
The red control condition is true, else the condition is false.
1: if (R value of ck min color) > (R value of layer0) or
(R value of layer0) > (R value of ck max color),
The red control condition is true, else the condition is false.
9
R/W
0
CK_GREENCON
Green control condition
0: if (G value of ck min color) <= (G value of layer0) <= (G value
of ck max color),
The green control condition is true, else the condition is false.
1: if (G value of ck min color) > (G value of layer0) or
(G value of layer0) > (G value of ck max color),
The green control condition is true, else the condition is false.
8
R/W
0
CK_BLUECON
Blue control condition
0: if (B value of ck min color) <= (B value of layer0) <= (B value of
ck max color),
The blue control condition is true, else the condition is false.
1: if (B value of ck min color) > (B value of layer0) or
(B value of layer0) > (B value of ck max color),
The blue control condition is true, else the condition is false.
7:5
/
/
/
4
R/W
0
PRI
Priority selection
0: ROP output channel is higher than channel 3
1: Channel 3 is higher than ROP output channel
3
/
/
/
2:1
R/W
0
ALPHACK_MOD
Alpha / Color key mode selection
0: alpha mode
1: color key mode, using the high priority layer as matching