The m_axis_video_tready signal can be asserted before, during, or after the cycle in which the Video in to AXI4-Stream core asserted m_axis_video_tvalid . The assertion of m_axis_video_tready can be dependent on the value of m_axis_video_tvalid . A slave that can immediately accept data qualified by m_axis_video_tvalid should pre-assert its m_axis_video_tready signal until data is received. Alternatively, m_axis_video_tready can be registered and driven the cycle following VALID assertion. Xilinx recommends that the AXI4-Stream slave drive the READY independently, or pre-assert READY to minimize latency.