wm8953 Wolfson Microelectronics plc, wm8953 Datasheet - Page 63

• Manufacturer Part Number: wm8953
• Description: Low Power Stereo Adc With Pll And Tdm Interface Low Power Stereo Adc With Pll And Tdm Interface
• Manufacturer: Wolfson Microelectronics plc

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Production Data
DIGITAL AUDIO INTERFACE CONTROL
The register bits controlling audio data format, word length, left/right channel data source and TDM
are summarised in Table 33.
Table 33 Audio Data Format Control
AUDIO INTERFACE OUTPUT AND GPIO TRISTATE
Register bit AIF_TRIS can be used to tristate the audio interface and GPIO pins as described in
Table 34.
All GPIO pins and digital audio interface pins will be tristated by this function, regardless of the state
of other registers which control these pin configurations.
Table 34 Tri-stating the Audio Interface and GPIO Pins
REGISTER
REGISTER
ADDRESS
R9 (09h)
ADDRESS
R4 (04h)
15
14
13
12
8
7
6:5
4:3
BIT
BIT
13
AIF_TRIS
AIFADCL_SRC
AIFADCR_SRC
AIFADC_TDM
AIFADC_TDM_
CHAN
AIF_BCLK_INV
AIF_LRCLK_IN
V
AIF_WL
[1:0]
AIF_FMT
[1:0]
LABEL
LABEL
DEFAULT
0
DEFAULT
0b
1b
0b
0b
0b
0b
10b
10b
Audio Interface and GPIO Tristate
0 = Audio interface and GPIO pins operate normally
1 = Tristate all audio interface and GPIO pins
Left ADC Data Source Select
0 = Left ADC data is output on left channel
1 = Right ADC data is output on left channel
Right ADC Data Source Select
0 = Left ADC data is output on right channel
1 = Right ADC data is output on right
channel
ADC TDM Enable
0 = Normal ADCDAT operation
1 = TDM enabled on ADCDAT
ADCDAT TDM Channel Select
0 = ADCDAT outputs data on slot 0
1 = ADCDAT output data on slot 1
BCLK Invert
0 = BCLK not inverted
1 = BCLK inverted
Right, left and I
0 = normal LRCLK polarity
1 = invert LRCLK polarity
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
Note - see “Companding” for the selection of
8-bit mode.
Digital Audio Interface Format
00 = Right justified
01 = Left justified
10 = I
11 = DSP Mode
2
S Format
DESCRIPTION
DESCRIPTION
2
S modes – LRCLK polarity
PD, January 2009, Rev 4.0
WM8953
63