I thought this was due to the synchronisation of the clock, but I found it impossible to synchronize the clock using FMC cable on two different boards.
What are you doing for the axis_clock?
--Are you also trying to transmit the axis_clock from tx to rx?
--Or you are generating an axis_clock at the rx ?
How did you try to sync the clock at the rx?
In my opinion a source synchronous clocking is a good method.
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