DCM module with internal line as CLKIN
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If you get these errors:
ERROR:NgdBuild:770 - IBUFG 'Inst_DCM71/CLKIN_IBUFG_INST' and BUFG 'Inst_DCM100/CLKFX_BUFG_INST' on net 'clk100' are lined up in series. Buffers of the same direction cannot be placed in series. ERROR:NgdBuild:924 - input pad net 'clk100' is driving non-buffer primitives: