WM8766
Preliminary Technical Data
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 DIN1/2/3 are always inputs to the WM8766 and DOUT is always an
output. The default is Slave mode.
In Slave mode, LRCLK and BCLK are inputs to the WM8766 DIN1/2/3 and LRCLK are sampled by
the WM8766 on the rising edge of BCLK.
By setting the control bit BCP the polarity of BCLK may be reversed so that DIN1/2/3 and LRCLK are
sampled on the falling edge of BCLK and DOUT changes on the rising edge of BCLK
BCLK
WM8766
DAC
DSP/
DECODER
LRCLK
DIN1/2/3
3
Figure 9 Slave Mode
In Master mode, LRCLK and BCLK are outputs from the WM8766 (Figure 10). LRCLK and BCLK are
generated by the WM8766. DIN1/2/3 are sampled by the WM8766 on the rising edge of BCLK.
By setting control bit BCP the polarity of BCLK may be reversed so that DIN1/2/3 are sampled on the
falling edge of BCLK, and DOUT changes on the rising edge of BCLK.
BCLK
DSP/
DECODER
WM8766
DAC
LRCLK
DIN1/2/3
3
Figure 10 Master Mode
PTD Rev 2.3 February 2004
14
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
