WM8961GEFLSLASHV datasheet(62/116 Pages) WOLFSON

62 / 116 page

WM8961

Pre-Production

PP, August 2009, Rev 3.1

Figure 37 DSP Mode Audio Interface (mode B, LRP=0, Slave)

DIGITAL AUDIO INTERFACE CONTROL

The register bits controlling audio format, word length and master / slave mode are summarised in

Table 44. MS selects audio interface operation in master or slave mode. In Master mode BCLK and

LRC are outputs. The frequency of LRC is set by LRCLK_RATE and BCLK is set by the bits BCLKDIV

(See “Clocking and Sample Rates”). In Slave mode BCLK and LRC are inputs.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R7 (07h)

Digital Audio

Interface

Format

ALRSWAP

Left/Right ADC channel swap

1 = Swap left and right ADC data in

audio interface

0 = Output left and right data as normal

BCLKINV

BCLK invert bit (for master and slave

modes)

0 = BCLK not inverted

1 = BCLK inverted

Master / Slave Mode Control

0 = Enable slave mode

1 = Enable master mode

DLRSWAP

Left/Right DAC Channel Swap

0 = Output left and right data as normal

1 = Swap left and right DAC data in

audio interface

LRP

Right, left and I

2S modes – LRC polarity

0 = normal LRC polarity

1 = invert LRC polarity

DSP Mode – mode A/B select

0 = MSB is available on 2

nd BCLK rising

edge after LRC rising edge (mode A)

1 = MSB is available on 1

st BCLK rising

edge after LRC rising edge (mode B)

3:2

WL[1:0]

Audio Data Word Length

00 = 16 bits

01 = 20 bits

10 = 24 bits

11 = 32 bits

1:0

FORMAT[1:0]

Audio Data Format Select

00 = Right justified

01 = Left justified

10 = I

2S Format

11 = DSP Mode

Table 44 Audio Data Format Control

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