ERROR:Xst:2033 - Port I of Input buffer XLXI_2/u_mem_controller/u_ddr2_infrastructure/DIFF_ENDED_CLKS_INST.SYS_CLK_INST is connected to GND ERROR:Xst:2033 - Port IB of Input buffer XLXI_2/u_mem_controller/u_ddr2_infrastructure/DIFF_ENDED_C…