Datasheet

ADSP-21369 EZ-KIT Lite Evaluation System Manual 2-11
ADSP-21369 EZ-KIT Lite Hardware Reference
Codec Setup Switch (SW3)
The codec setup switch (SW3) can be used to change the routing of some
signals going to the AD1835A codec and to set up the communication
protocol of the codec.
SW3 positions 1 and 2 determine the clock routing for the audio oscillator
to the codec and to the processor. Figure 2-5 illustrates how the switch
positions 1 and 2 connect on the board. In the default position, route the
DAI_P17 pin to DAI_P6 (in software) to clock the AD1835A codec.
SW3 position 3 determines if the AD1835A device is a master or a slave. If
the AD1835A is a master, the device’s serial interface generates the frame
sync and clock signals necessary to transfer data. When the device is a
slave, the processor must generate the frame sync and clock signals. By
default, position 3 is
ON, and the AD1835A codec generates the control
signals.
SW3 position 4 disconnects the AD1835A codec’s ADC_DATA pin from the
DAI. This is useful when the DAI is connected to another device.
Figure 2-5. Audio Clock Routing
ADSP-21369 Processor AD1835A Codec
DAI_P6
DAI_P17
MCLK
12.288 MHz
OSC
SW3.1
SW3.2