Hi,
Constellation 156 doesn't support Vivado yet. Did you enable Vivado flow support in Design Details (Ctrl+D) in StellarIP yourself? By default it should not be enabled. Could you please try to run generate with a clean .dsn taken from the BSP release with ISE support.
The reference design supports acquisition of data on the ADC inputs, and generation of a waveform on the DAC outputs. These two are not linked, is there a specific reason that you want to replay the ADC waveform directly on the DAC outputs? In the reference software, Fmc15xAPP -> main.cpp, you will see that the software generates a waveform that is loaded to the DACs (function: GenerateWaveform16()). By modifying this function you can change the output waveforms of the DACs.
We don't have a reference design that includes microblaze support, if you want to have such a reference design I would recommend you to get in contact with the sales department.
Best regards,
Ingmar