Allwinner A20 - Page 544

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 544 / 812
Offset:
Layer0: 0x8A0
Layer1: 0x8A4
Layer2: 0x8A8
Layer3: 0x8AC
Register Name: DEBE_ATTCTL_REG1
Bit
Read/W
rite
Default/
Hex
Description
0011: 8-bpp
other: Reserved
Internal Frame buffer mode data format
0000: 1-bpp
0001: 2-bpp
0010: 4-bpp
0011: 8-bpp
Other: Reserved
7:3
/
/
/
2
R/W
UDF
LAY_BRSWAPEN
B R channel swap
0: RGB. Follow the bit[11:8]----RGB
1: BGR. Swap the B R channel in the data format.
1:0
R/W
UDF
LAY_FBPS
PS
Pixels Sequence
See the follow table “Pixels Sequence”
5.4.4.14. PIXELS SEQUENCE TABLE
DE-layer attribute control register1 [11:08] = FBF (frame buffer format)
DE-layer attribute control register1 [01:00] = PS (pixels sequence)
Mono or internal frame buffer 1-bpp or palette 1-bpp mode : FBF = 0000
PS=00
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
P31
P30
P29
P28
P27
P26
P25
P24
P23
P22
P21
P20
P19
P18
P17
P16
P15
P14
P13
P12
P11
P10
P09
P08
P07
P06
P05
P04
P03
P02
P01
P00