WM8775EDSSLASHR datasheet(15/36 Pages) WOLFSON

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WM8775

PP Rev 1.8, 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 ADCDAT is always an output. The default is Slave mode.

In Slave mode (MS=0) ADCLRC and BCLK are inputs to the WM8775 (Figure 10). ADCLRC is

sampled by the WM8775 on the rising edge of BCLK. ADC data is output on DOUT and changes on

the falling edge of BCLK. By setting control bit BCLKINV the polarity of BCLK may be reversed so

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

BCLK.

BCLK

DOUT

ADCLRC

WM8775

ADC

DVD

Controller

Figure 10 Slave Mode

In Master mode (MS=1) ADCLRC and BCLK are outputs from the WM8775 (Figure 11). ADCLRC

and BITCLK are generated by the WM8775. ADCDAT is output on DOUT and changes on the falling

edge of BCLK. By setting control bit BCLKINV, the polarity of BCLK may be reversed so that DOUT

changes on the rising edge of BCLK.

BCLK

DOUT

ADCLRC

WM8775

ADC

DVD

Controller

Figure 11 Master Mode

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