Allwinner A20 - Page 320

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 320 / 812
Offset:
iDMA0:0x50
iDMA1:0x54
iDMA2:0x58
iDMA3:0x5C
Register Name: MP_IDMASET_REG
Bit
Read/W
rite
Default/He
x
Description
0:Ignore
Output alpha value = pixels alpha, if no pixel alpha, the alpha
value equal 0xff
1:Globe alpha enable
Ignore pixel alpha value
Output alpha value = globe alpha value
2: Globe alpha mix pixel alpha
Output alpha value = globe alpha value * pixels alpha value
3:Reserved
Note: the output alpha value here means the input alpha value
of the ALU following the DMA controller.
1
R/W
0
IDMA_WORKMOD
Work mode selection
0: normal mode ( non-palette mode )
1: palette mode
0
R/W
0
IDMA_EN
Input DMA enable control
0:disable input DMA channel, the respective fill-color value will
stead of the input data.
1:enable
3.1.4.10. INPUT DMA FILL-COLOR REGISTER
Offset:
iDMA0:0x60
iDMA1:0x64
iDMA2:0x68
iDMA3:0x6C
Register Name: MP_IDMAFILLCOLOR_REG