assign CLKIN_IBUFG_OUT = CLKIN_IBUFG;
    BUFG CLKFX_BUFG_INST (.I(CLKFX_BUF), 
                          .O(CLKFX_OUT));
-   IBUFG CLKIN_IBUFG_INST (.I(CLKIN_IN), 
-                           .O(CLKIN_IBUFG));
    DCM_SP DCM_SP_INST (.CLKFB(GND_BIT), 
-                       .CLKIN(CLKIN_IBUFG), 
+                       .CLKIN(CLKIN_IN), 
                        .DSSEN(GND_BIT), 
                        .PSCLK(GND_BIT), 
                        .PSEN(GND_BIT),