wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 60

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

WM9081
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 32.
Table 32 Digital Audio Interface Data Control
AUDIO INTERFACE OUTPUT TRI-STATE
Register bit AIF_TRIS can be used to tri-state the audio interface pins LRCLK and BCLK as
described in Table 33. This function tri-states the audio interface pins regardless of the state of other
registers which control these pin configurations.
R22 (16h)
Audio
Interface 1
R23 (17h)
Audio
Interface 2
REGISTER
ADDRESS
BIT
5:4
3:2
3:2
1:0
6
8
7
4
AIFDAC_CHAN
AIFDAC_TDM_
SLOT
AIFDAC_TDM_
MODE
DAC_DAT_INV
AIF_BCLK_INV
AIF_LRCLK_IN
V
AIF_WL [1:0]
AIF_FMT [1:0]
LABEL
DEFAULT
00
00
00
10
0
0
0
0
DAC Data Source Select
0 = DAC selects left channel data
1 = DAC selects right channel data
DAC TDM Slot Select
00 = Select slot 0 (Left/Right)
01 = Select slot 1 (Left/Right)
10 = Select slot 2 (Left/Right)
11 = Select slot 3 (Left/Right)
DAC TDM Mode Select
00 = 1 stereo slot (TDM off)
01 = 2 stereo slots
10 = 3 stereo slots
11 = 4 stereo slots
DACDAT Invert
0 = DACDAT not inverted
1 = DACDAT inverted
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
2
S modes – LRCLK polarity:
PP, Rev 3.0, April 2009
Pre-Production
60