ERROR:NgdBuild:770 - IBUFG
'memory_burst/DDR3_CORE/memc3_infrastructure_instfile:///C:\Users\wangzhb\AppData\Local\Temp\V7(XMWRN]{G8~CI}BCCR3QC.gif_input_clk.u_ibufg_sys_cl k' and BUFG 'UserClock/clkout2_buf' on net 'CLK_OUT3_312_5M' are lined up in series.
Buffers of the same direction cannot be placed in series.
ERROR:NgdBuild:924 - input pad net 'CLK_OUT3_312_5M' is driving non-buffer
primitives: