The m_axis_video_tready signal can be asserted before, during, or after the cycle in which the Sensor Demosaic core asserts 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 preassert 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.
RECOMMENDED: To minimize latency, your custom core slave interface should drive READY independently, or preassert READY.