Synchronizing ADCs and DACs

Question

Hello, 
 I have implemented this project ( wiki.analog.com/.../quickstart) on a mercury xu7 board. The project is working well, however, I would like to modify this project to synchronize the DAC and ADCs. I want to use a cyclic buffer on the DAC and have this buffer be read by the ADC at the same time at every iteration. How could I do this? 
 I am sending some samples (made from matlab or python) to the AD9082 DAC and retrieving the data through the ADC. Is there a way to trigger the rx buffer write as soon as the tx starts transmitting the samples keeping in mind that the tx buffer is cyclic? 
 
 Thank you for your help.

IonutP · Accepted Answer

Hi, 
 In order to implement the TX/RX synchronization, the TDD engine should be enabled and integrated into the project by setting the following synthesis parameters: TDD_SUPPORT=1 SHARED_DEVCLK=1 
 The TDD frame length should be equal to the buffer size in order to achieve a cyclic read at the same time at every iteration. The TDD pulses will dictate when the TX/RX buffers are triggered, so if you want them to happen at precisely the same time, then the CH0/1 ON/OFF should be equal. 
 For more information please visit: 
 AXI TDD &mdash; HDL documentation (analogdevicesinc.github.io) 
 Below you can find a radar application on MXFE using the TDD synchronization mechanism: 
 gr-ofdmradar - OFDM Radar on MxFE Platforms using IIO [Analog Devices Wiki] 
 Please let us know if you have additional questions. 
 Regards, 
 Ionut)

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Synchronizing ADCs and DACs