If data is not being transmitted or received, check the following conditions:
•If transmit s_axi_tx_tready is stuck Low following the s_axi_rx_tvalid input being asserted, the core cannot send data.
•If the receive m_axi_rx_tvalid is stuck Low, the core is not receiving data.
•Check that the user_clk input is connected and toggling.
•Check that the AXI4-Stream waveforms are being followed. See This Figure for data transfer and This Figure for data reception.
•Check core configuration.