WM8774IFT datasheet(15/42 Pages) WOLFSON

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WM8774

PP Rev 1.0 June 2002

BCLK

DOUT

ADCLRC

DIN

DACLRC

WM8774

CODEC

DVD

Controller

Figure 7 Slave Mode

In Master mode (MS=1) ADCLRC, DACLRC and BCLK are outputs from the WM8774 (Figure 8).

ADCLRC, DACLRC and BITCLK are generated by the WM8774. DIN is sampled by the WM8774 on

the rising edge of BCLK so the controller must output DAC data that changes on the falling edge of

BCLK. 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 DIN is sampled on the falling edge of BCLK

and DOUT changes on the rising edge of BCLK.

BCLK

DOUT

ADCLRC

DIN

DACLRC

WM8774

CODEC

DVD

Controller

Figure 8 Master Mode

AUDIO INTERFACE FORMATS

Audio data is applied to the internal DAC filters, or output from the ADC filters, via the Digital Audio

Interface. 5 popular interface formats are supported:

•

Left Justified mode

•

Right Justified mode

•

2S mode

•

DSP Early mode

•

DSP Late mode

All 5 formats send the MSB first and support word lengths of 16, 20, 24 and 32 bits, with the

exception of 32 bit right justified mode, which is not supported.

In left justified, right justified and I

2S modes, the digital audio interface receives DAC data on the DIN

inputs and outputs ADC data on DOUT. Audio Data for each stereo channel is time multiplexed with

ADCLRC/DACLRC indicating whether the left or right channel is present. ADCLRC/DACLRC is also

used as a timing reference to indicate the beginning or end of the data words.

WM8774IFT Datasheet(PDF) 15 Page - Wolfson Microelectronics plc

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