WM8734 datasheet(26/46 Pages) WOLFSON

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WM8734

Production Data

PD Rev 4.1 November 2006

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

1:0

FORMAT[1:0]

Audio Data Format Select

11 = DSP Mode, frame sync + 2 data

packed words

10 = I

2S Format, MSB-First left-1

justified

01 = MSB-First, left justified

00 = MSB-First, right justified

3:2

IWL[1:0]

Input Audio Data Bit Length Select

11 = 32 bits

10 = 24 bits

01 = 20 bits

00 = 16 bits

LRP

DACLRC phase control (in left, right

or I

2S modes)

1 = Right Channel DAC data when

DACLRC high

0 = Right Channel DAC data when

DACLRC low

(opposite phasing in I

2S mode)

DSP mode A/B select (in DSP mode

only)

1 = MSB is available on 2nd BCLK

rising edge after ADCLRC/DACLRC

rising edge

0 = MSB is available on 1st BCLK

rising edge after ADCLRC/DACLRC

rising edge

LRSWAP

DAC Left Right Clock Swap

1 = Right Channel DAC Data Left

0 = Right Channel DAC Data Right

Master Slave Mode Control

1 = Enable Master Mode

0 = Enable Slave Mode

0000111

Digital Audio

Interface

Format

BCLKINV

Bit Clock Invert

1 = Invert BCLK

0 = Don’t invert BCLK

Table 7 Digital Audio Interface Control

Note: If right justified 32 bit mode is selected then the WM8734 defaults to 24 bits.

MASTER AND SLAVE MODE OPERATION

The WM8734 can be configured as either a master or slave mode device. As a master mode device

the WM8734 controls sequencing of the data and clocks on the digital audio interface. As a slave

device the WM8734 responds with data to the clocks it receives over the digital audio interface. The

mode is set with the MS bit of the control register as shown in Table 8.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0000111

Digital Audio Interface

Format

Master Slave Mode Control

1 = Enable Master Mode

0 = Enable Slave Mode

Table 8 Programming Master/Slave Modes

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