After the subsystem is added to the block design canvas, design assistance is enabled and Run Block Automation and Run Connection Automation commands are enabled. See For Kintex UltraScale KCU105 Board.The Run Block Automation command connects the subsystem AXI4-Stream interface to a DMA or a FIFO as selected in the Vivado IDE. The gtx_clk, ref_clk, and lvds clocks are connected to respective clock sources when the clock source is already present, else it would instantiate a clock wizard. It also connects the mii/gmii/rgmii/sgmii/sfp along with the mdio and phy_rst_n ports based on the interface available for the selected board or part.Note: You cannot configure the subsystem using the block automation Vivado IDE; therefore, it is recommended first to configure the subsystem and then run block automation.