Allwinner A20 - Page 448

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 448 / 812
Offset: 0x048
Register name: Aud_Fmt
Bits
Read
/Write
Default
/Hex
Description
31
R/W
0
Audio Source Selection
0: Audio data from DMA inputs
1: Audio data from embedded Audio Signal Generator
Note: DMA input should be 32bit wide
30:26
/
/
reserved
26:24
R/W
0
AUD_FMT_SEL:
Audio format selection
000: liner PCM
001: IEC61937 compress formats
010: HBR audio
011: one bit audio
1xx: reserved
23:5
/
/
reserved
4
R/W
0
DSD_FMT
0: LSB first
1:MSB first
3
R/W
0
AUD_LAYOUT:
PCM/1-bit Audio layout selection
0: layout 0 (2 channels)
1: layout 1 (up to 8 channels)
2:0
R/W
PCM_SRC_CH_CFG(LPCM & One Bit Audio)
Source pcm/1-bit audio configuration
000: 1channel
001: 2 channel
010: 3 channel
011: 4 channel
100: 5 channel
101: 6 channel
110: 7 channel
111: 8 channel
Note: this only indicates how many channels of input PCM
stream; it does not mean the sink can accept it. So the source
should check the CA field of the audio info-frame to decide which
channel will be output.