Two ADAU1701s sharing the same MCLK?
At the moment I have an application which will require two ADAU1701 DSPs. I am not yet set on building a dedicated dual DSP board and might simply use two identical boards with a single DSP setup on each. Regardless of which route I take, I'd like to have both DSPs running off of the same MCLK. Jerad posted a response in a thread last year describing how to output a generated clock from the serial output (MP11). I have followed those instructions and using the attached project I get the correct clock on MP11. After storing the project in memory, I am able to self boot the DSP and the clock appears on each reset. However, that only works when the USB connection to the USBi board is connected. As soon as I disconnect the USB cable from the USBi and reset again, the clock disappears. Does anyone see anything wrong with my setup?
Thanks!
Audio Signal Processors
SigmaDSP Audio Processors
adau1701
This sounds like a hardware issue. The USBi provides power to the evaluation boards and also has I2C bus pull-ups that work in parallel with pull-ups on the target board. Are you sure that your target board has I2C pull-ups? How about the power supply?
At the moment I am using the large ADAU1701 eval board (EVAL-ADAU170XEBZ) as the "master" to generate the clock. It is powered by it's own power supply. I have not connected the "slave" DSP board yet as I wanted to make the sure the clock was being generated correctly first. The slave board will intially be an EVAL-ADAU1701MINIZ.
Thanks!
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