Allwinner A20 - Page 549

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 549 / 812
Offset: 0x8E0
Register Name: DEBE_HWCFBCTL_REG
Bit
Read/W
rite
Default/
Hex
Description
Y size control
00: 32pixels per line
01: 64pixels per line
Other: reserved
3:2
R/W
UDF
HWC_XSIZE
X size control
00: 32pixels per row
01: 64pixels per row
Other: reserved
1:0
R/W
UDF
HWC_FBFMT
Pixels format control
00: 1bpp
01: 2bpp
10: 4bpp
11: 8bpp
5.4.4.17. DE BACKEND WRITE BACK CONTROL REGISTER
Offset: 0x8F0
Register Name: DEBE_WBCTL_REG
Bit
Read/W
rite
Default/
Hex
Description
31:13
/
/
/
12
R/W
UDF
WB_FMT
Write back data format setting
0:
ARGB (little endian system)
1:
BGRA (little endian system)
11:10
/
/
/
9
R/W
UDF
WB_EFLAG
Error flag
0:
1: write back error