WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 100

• Manufacturer Part Number: WM8959
• Description: Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8959
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DIGITAL AUDIO INTERFACE CONTROL
The register bits controlling audio data format, word length, left/right channel data source and TDM
are summarised in Table 51.
Table 51 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 52.
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 52 Tri-stating the Audio Interface and GPIO Pins
REGISTER
REGISTER
ADDRESS
R9 (09h)
ADDRESS
R4 (04h)
R5 (05h)
BIT
8
7
6:5
4:3
15
14
12
13
13
BIT
AIF_TRIS
LABEL
AIF_BCLK_INV
AIF_LRCLK_
INV
AIF_WL
[1:0]
AIF_FMT
[1:0]
DACL_SRC
DACR_SRC
AIFDAC_TDM
AIFDAC_TDM_
CHAN
LABEL
DEFAULT
0
DEFAULT
0b
0b
10b
10b
0b
1b
0b
0b
Audio Interface and GPIO Tristate
0 = Audio interface and GPIO pins operate normally
1 = Tristate all audio interface and GPIO pins
BCLK Invert
0 = BCLK not inverted
1 = BCLK inverted
Right, left and I
0 = normal DACLRC polarity
1 = invert DACLRC polarity
DSP Mode – mode A/B select
0 = MSB is available on 2nd BCLK rising
edge after DACLRC rising edge (mode A)
1 = MSB is available on 1st BCLK rising
edge after DACLRC 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
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
DAC TDM Enable
0 = Normal DACDAT operation
1 = TDM enabled on DACDAT
DACDAT TDM Channel Select
0 = DACDAT data input on slot 0
1 = DACDAT data input on slot 1
2
S Format
DESCRIPTION
DESCRIPTION
2
S modes – DACLRC polarity
PP, May 2008, Rev 3.1
Pre-Production
100