Production Data
WM8522
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 WM8522.
In Slave mode, LRCLK and BCLK are inputs to the WM8522 DIN1/2/3 and LRCLK are sampled by
the WM8522 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.
BCLK
WM8522
DAC
DSP/
DECODER
LRCLK
DIN1/2/3
3
Figure 11 Slave Mode
In Master mode, LRCLK and BCLK are outputs from the WM8522 (Figure 12). LRCLK and BCLK are
generated by the WM8522. DIN1/2/3 are sampled by the WM8522 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.
BCLK
DSP/
DECODER
WM8522
DAC
LRCLK
DIN1/2/3
3
Figure 12 Master Mode
PD Rev 4.0 July 2006
15
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
