ibuf_ibufg.v

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`timescale 1ns/1ps
/*Quote from Xilinx  "7 Series FPGA SelectIO Primitives":
The IBUF and IBUFG primitives are the same. IBUFGs are used when an input buffer is
used as a clock input. In the Xilinx software tools, an IBUFG is automatically placed at
clock input sites.

Actually, it still complains:

WARNING: [DRC 23-20] Rule violation (CKLD-2) Clock Net has direct IO Driver - Clock net clocks393_i/ibuf_ibufg_i/memclk_0 is directly
         driven by an IO rather than a Clock Buffer. Driverx393.s: clocks393_i/ibuf_ibufg_i/IBUF_i/O[VivadoPlace:0000]

*/
module  ibuf_ibufg  #(
        parameter CAPACITANCE =      "DONT_CARE",
        parameter IBUF_DELAY_VALUE = "0",
        parameter IBUF_LOW_PWR =     "TRUE",
        parameter IFD_DELAY_VALUE =  "AUTO",
        parameter IOSTANDARD =       "DEFAULT" 
    )(
        output O,
        input  I
);
    IBUF #(
        .CAPACITANCE       (CAPACITANCE),
        .IBUF_DELAY_VALUE  (IBUF_DELAY_VALUE),
        .IBUF_LOW_PWR      (IBUF_LOW_PWR),
        .IFD_DELAY_VALUE   (IFD_DELAY_VALUE),
        .IOSTANDARD        (IOSTANDARD)
    ) IBUF_i (
        .O    (O), // output 
        .I    (I) // input 
    );
endmodule