Datasheet
ADSP-21262 EZ-KIT Lite Evaluation System Manual 1-9
Using ADSP-21262 EZ-KIT Lite
The processor is interfaced with the AD1835A via the digital audio inter-
face (DAI) port. The DAI interface pins can be configured to transfer
serial data from the AD1835A codec in either time-division multiplexed
(TDM) or two-wire interface (TWI) mode. For more information on how
the AD1835A connects to the DAI, see “DAI Interface” on page 2-5.
The master input clock (
MCLK) for the AD1835A can be generated by the
on-board 12.288 MHz oscillator or can be supplied by one of the DAI
pins of the processor. Using one if the pins to generate the MCLK, as
opposed to the on-board oscillator, allows synchronization of multiple
devices in the system. This is done on the EZ-KIT Lite when data is com-
ing from the S/PDIF receiver and being output through the audio codec.
The S/PDIF MCLK is routed to the AD1835A MCLK in the processor’s signal
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
(SW7)” on page 2-10.
The AD1835A codec can be configured as a master or as a slave, depend-
ing on the DIP switch settings (SW7). 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 (SW7)” on page 2-10.
The AD1835A audio codec’s internal configuration registers are config-
ured using the processor’s SPI port. The
FLAG3 register is used as the select
for the device. For information on how to configure the multichannel
codec, refer to the codec datasheet at
http://www.analog.com/en/prod/0,2877,AD1835A,00.html.
The RCA connector (
J4) is used to input analog audio. When using an
electret microphone on this connector, configure the SW6 switch according
the instructions in “Electret Microphone Select Switch (SW6)” on