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//////////////////////////////////////////////////////////////////////

module

  recursive_axis_catenate

  #(

    N, // data bus width in bytes

    I = 1, // TID width

    D = 1, // TDEST width

    U = 1, // TUSER width

    U_IS_EOP = -1,

    MN // number of inputs to mux

  )

  (

    axis_if axis_in[MN-1:0],

    axis_if axis_out,

    input   aclk,

    input   aresetn

  );

// --------------------------------------------------------------------

// synthesis translate_off

  initial begin

    assert(MN > 0) else $fatal;

  end

// synthesis translate_on

// --------------------------------------------------------------------

  // --------------------------------------------------------------------

  localparam MA = $clog2(MN);    // mux select width

  localparam MH = 2 ** (MA - 1); // half of ceil(number of inputs)

  localparam MR = MN - MH;       // upper remainder

  // --------------------------------------------------------------------

  generate

    if(MN == 1) begin : one

      axis_alias axis_alias_i(axis_in[0], axis_out);

    end

    else if(MN == 2) begin : two

      axis_catenate #(.N(N), .I(I), .D(D), .U(U), .U_IS_EOP(U_IS_EOP))

        axis_catenate_i(.*);

    end

    else begin: recurse

      axis_if #(.N(N), .I(I), .D(D), .U(U)) axis_catenate_out[1:0](.*);

      recursive_axis_catenate

        #( .N(N)

        ,  .I(I)

        ,  .D(D)

        ,  .U(U)

        ,  .U_IS_EOP(U_IS_EOP)

        ,  .MN(MH)

        )

        catenate_lo

        ( .axis_in(axis_in[MH-1:0]),

          .axis_out(axis_catenate_out[0]),

          .* );

      if(MR == 1) begin : one

        axis_alias axis_alias_i(axis_in[MH], axis_catenate_out[1]);

      end

      else if(MR == 2) begin : two

        axis_catenate #(.N(N), .I(I), .D(D), .U(U), .U_IS_EOP(U_IS_EOP))

          axis_catenate_i

          ( .axis_in(axis_in[MH+1:MH]),

            .axis_out(axis_catenate_out[1]),

            .* );

      end

      else begin : more

        recursive_axis_catenate

          #( .N(N)

          ,  .I(I)

          ,  .D(D)

          ,  .U(U)

          ,  .U_IS_EOP(U_IS_EOP)

          ,  .MN(MR)

          )

          catenate_hi

          ( .axis_in(axis_in[MN-1:MN-MR]),

            .axis_out(axis_catenate_out[1]),

            .* );

      end

      axis_catenate #(.N(N), .I(I), .D(D), .U(U), .U_IS_EOP(U_IS_EOP))

        axis_catenate_i(.axis_in(axis_catenate_out), .*);

    end

  endgenerate

// --------------------------------------------------------------------

endmodule