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1-10 ADSP-21369 EZ-KIT Lite Evaluation System Manual
routing unit (SRU). It is also necessary to disable the on-board audio
oscillator from driving the audio codec and the processor’s input pin. For
instructions on how to configure the clock, refer to “Codec Setup Switch
(SW3)” on page 2-10.
The AD1835A codec can be configured as a master or as a slave, depend-
ing on the DIP switch settings. In master mode, the AD1835A drives the
serial port clock and frame sync signals to the processor. In slave mode,
the processor must generate and drive all of the serial port clock and frame
sync signals. For information on how to set the mode, refer to “Codec
Setup Switch (SW3)” on page 2-10.
The AD1835A audio codec’s internal configuration registers are config-
ured using the SPI port of the processor. The DPI pin 4 (
DPI4 register) is
used as the select for the device. For information on how to configure the
multichannel codec, refer to the codec’s datasheet, which can be found at
http://www.analog.com/en/prod/0,2877,AD1835A,00.html.
The RCA connector (
P10) is used to input analog audio. When using an
electret microphone on this connector, configure the SW4 switch according
the instructions in “Electret Microphone Select Switch (SW4)” on
page 2-11. The four output channels connect to the RCA connector
J5.
Channel 4 of the codec connects to the headphone jack P7. For more
information about the connectors see “Connectors” on page 2-20.
Example programs are included in the EZ-KIT Lite installation directory
to demonstrate how to configure and use the board’s analog audio
interface.
LEDs and Push Buttons
The EZ-KIT Lite has eight general-purpose user LEDs and four gen-
eral-purpose push buttons.