wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 88

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8918
DIGITAL AUDIO INTERFACE CONTROL
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The register bits controlling audio data format, word length, left/right channel data source and TDM
are summarised in Table 50.
Table 50 Digital Audio Interface Data Control
R24 (18h)
Audio
Interface 0
R25 (19h)
Audio
Interface 1
REGISTER
ADDRESS
BIT
3:2
1:0
13
12
11
10
7
6
5
4
7
4
AIFRXR_SRC
AIF_FMT [1:0]
AIFTXR_SRC
AIFRX_TDM_
AIF_BCLK_IN
AIF_LRCLK_I
AIFTXL_SRC
AIFRXL_SRC
AIFTX_TDM_
AIF_WL [1:0]
AIFRX_TDM
AIFTX_TDM
LABEL
CHAN
CHAN
NV
V
DEFAULT
10
10
0
1
0
1
0
0
0
0
0
0
Left Digital Audio interface source
0 = Left DMIC data is output on left channel
1 = Right DMIC data is output on left
channel
Right Digital Audio interface source
0 = Left DMIC data is output on right
channel
1 = Right DMIC data is output on right
channel
Left DAC Data Source Select
0 = Left DAC outputs left channel data
1 = Left DAC outputs right channel data
Right DAC Data Source Select
0 = Right DAC outputs left channel data
1 = Right DAC outputs right channel data
AIFRX TDM Enable
0 = Normal AIFRXDAT operation
1 = TDM enabled on AIFRXDAT
AIFRX TDM Channel Select
0 = AIFRXDAT data input on slot 0
1 = AIFRXDAT data input on slot 1
AIFTX TDM Enable
0 = Normal AIFTXDAT operation
1 = TDM enabled on AIFTXDAT
AIFTX TDM Channel Select
0 = AIFTXDAT outputs data on slot 0
1 = AIFTXDAT output data on slot 1
BCLK Invert
0 = BCLK not inverted
1 = BCLK inverted
LRC Polarity / DSP Mode A-B select.
Right, left and I2S modes – LRC polarity
0 = Not Inverted
1 = Inverted
DSP Mode – Mode A-B select
0 = MSB is available on 2nd BCLK rising
edge after LRC rising edge (mode A)
1 = MSB is available on 1st BCLK rising
edge after LRC rising edge (mode B)
Digital Audio Interface Word Length
00 = 16 bits
01 = 20 bits
10 = 24 bits
11 = 32 bits
Digital Audio Interface Format
00 = Right Justified
01 = Left Justified
10 = I2S
11 = DSP
PD, Rev 4.0, September 2010
DESCRIPTION
Production Data
88