WM8731SEDSSLASHR datasheet(39/63 Pages) WOLFSON

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WM8731 / WM8731L

Production Data

PD Rev 4.3 August 2006

MASTER AND SLAVE MODE OPERATION

The WM8731/L can be configured as either a master or slave mode device. As a master mode

device the WM8731/L controls sequencing of the data and clocks on the digital audio interface. As a

slave device the WM8731/L 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 16.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0000111

Digital Audio Interface

Format

Master Slave Mode Control

1 = Enable Master Mode

0 = Enable Slave Mode

Table 16 Programming Master/Slave Modes

As a master mode device the WM8731/L controls the sequencing of data transfer (ADCDAT,

DACDAT) and output of clocks (BCLK, ADCLRC, DACLRC) over the digital audio interface. It uses

the timing generated from either its on-board crystal or the MCLK input as the reference for the clock

and data transitions. This is illustrated in Figure 31. ADCDAT is always an output from and DACDAT

is always an input to the WM8731/L independent of master or slave mode.

BCLK

ADCDAT

ADCLRC

DACDAT

DACLRC

WM8731

CODEC

DSP

ENCODER/

DECODER

Note: ADC and DAC can run at different rates

Figure 31 Master Mode

As a slave device the WM8731/L sequences the data transfer (ADCDAT, DACDAT) over the digital

audio interface in response to the external applied clocks (BCLK, ADCLRC, DACLRC). This is

illustrated in Figure 32.

BCLK

ADCDAT

ADCLRC

DACDAT

DACLRC

WM8731

CODEC

DSP

ENCODER/

DECODER

Note: The ADC and DAC can run at different rates

Figure 32 Slave Mode

Note that the WM8731/L relies on controlled phase relationships between audio interface BCLK,

DACLRC and the master MCLK or CLKOUT. To avoid any timing hazards, refer to the timing section

for detailed information.

WM8731SEDS/R Datasheet(PDF) 39 Page - Wolfson Microelectronics plc

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