Allwinner A20 - Page 446

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 446 / 812
5.2.4.11. AUDIO CONTROL REGISTER:
Offset: 0x040
Register name: Aud_Ctrl
Bits
Read
/Write
Default
/Hex
Description
31
R/W
0
AUD_EN:
0:disable
1:enable
Audio module enable
30
R/W
0
AUD_RST:
0: normal
1: reset
Audio module soft reset
Write 1 to reset Audio module, and automatically clear to 0 after
reset.
Write 0 to this bit has no effect.
Note: before change the audio parameters, first disable the
AUD_EN, then write 1 to AUD_RST to reset the audio module,
when this reset bit return to 0, then configure the parameters and
enable the AUD_EN.
29:0
/
/
reserved
5.2.4.12. AUDIO DMA&FIFO CONTROL REGISTER:
Offset: 0x044
Register name: ADMA_Ctrl
Bits
Read
/Write
Default
/Hex
Description
31
R/W
0
Audio Source DMA Mode
0: dedicated DMA
1: normal DMA
30:26
/
/
reserved
25:24
R/W
0
DMA REQ CRTL
00: 1/2 FIFO empty