In reply to cgales:
Thank you for the answer!
If I get it right, in the task I need to wait cb.S_AXIS_TREADY to avoid additional handshakes. But this is not what I wanted: master must rise cb.S_AXIS_TVALID as soon as he is ready,
he should not wait slave’s cb.S_AXIS_TREADY to do it. And I don’t understand how I can achieve such behavior.