WM8776 datasheet(19/57 Pages) WOLFSON

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Production Data

WM8776

PD Rev 4.0 April 2005

DIGITAL AUDIO INTERFACE

MASTER AND SLAVE MODES

The audio interface operates in either Slave or Master mode, selectable using the MS control bit. In

both Master and Slave modes DIN is always an input to the WM8776 and DOUT is always an output.

The default is Slave mode.

In Slave mode (MS=0) ADCLRC, DACLRC, ADCBCLK and DACBCLK are inputs to the WM8776

(Figure 11). DIN and DACLRC are sampled by the WM8776 on the rising edge of DACBCLK,

ADCLRC is sampled on the rising edge of ADCBCLK. ADC data is output on DOUT and changes on

the falling edge of ADCBCLK. By setting control bit BCLKINV the polarity of ADCBCLK and

DACBCLK may be reversed so that DIN and DACLRC are sampled on the falling edge of DACBCLK,

ADCLRC is sampled on the falling edge of ADCBCLK and DOUT changes on the rising edge of

ADCBCLK.

ADCBCLK

DOUT

ADCLRC

DIN

DACLRC

WM8776

CODEC

DVD

Controller

DACBCLK

Figure 11 Slave Mode

In Master mode (MS=1) ADCLRC, DACLRC, ADCBCLK and DACBCLK are outputs from the

WM8776 (Figure 12). ADCLRC, DACLRC, ADCBCLK and DACBCLK are generated by the WM8776.

DIN is sampled by the WM8776 on the rising edge of DACBCLK so the controller must output DAC

data that changes on the falling edge of DACBCLK. ADC data is output on DOUT and changes on

the falling edge of ADCBCLK. By setting control bit BCLKINV, the polarity of ADCBCLK and

DACBCLK may be reversed so that DIN is sampled on the falling edge of DACBCLK and DOUT

changes on the rising edge of ADCBCLK.

ADCBCLK

DOUT

ADCLRC

DIN

DACLRC

WM8776

CODEC

DVD

Controller

DACBCLK

Figure 12 Master Mode

WM8776 Datasheet(PDF) 19 Page - Wolfson Microelectronics plc

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