WM8776 datasheet(17/55 Pages) WOLFSON

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WM8776

PP Rev 1.91 June 2004

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 10). 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 10 Slave Mode

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

WM8776 (Figure 11). 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 11 Master Mode

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