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AD9364 1r1t tx not correct


I have a problem similar to the "AD9361 1R1T mode issue" question, but with no-os firmware, microblaze processor and an application on a board of ours with an ARTIX-7 and the AD9364.

In this case I think there are not compatibility issues. 

Anyway I have the dac_valid lines that go high once every 4 clock cycles, unlike the adc_valid lines that go high once every 2 clock cycles.

I'm non using DDS (parameter DAC DDS DISABLE = 1 in block diagram).

I'm using Vivado suite 2020.1.

Any suggestion?

Thank you