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

module

  axis_synchronizer

  #(

    N,              // data bus width in bytes

    I = 1,          // TID width

    D = 1,          // TDEST width

    U = 1,          // TUSER width

    USE_TSTRB = 0,  //  set to 1 to enable, 0 to disable

    USE_TKEEP = 0,  //  set to 1 to enable, 0 to disable

    FD

  )

  (

    axis_if axis_in,

    axis_if axis_out,

    input   aclk_in,

    input   aresetn_in,

    input   aclk_out,

    input   aresetn_out

  );

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

  //

  localparam W = (N * 8) + (N * USE_TSTRB) + (N * USE_TKEEP) + I + D + U + 1;

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

  //

  wire          wr_full;

  wire [W-1:0]  wr_data;

  wire          wr_en;

  wire          rd_empty;

  wire [W-1:0]  rd_data;

  wire          rd_en;

  defparam async_fifo_i.W=W; // why are these needed for recursive modules?

  defparam async_fifo_i.D=FD;

  async_fifo

  // async_fifo #(.W(W), .D(FD))

    async_fifo_i

    (

      .wr_clk(aclk_in),

      .wr_reset(~aresetn_in),

      .rd_clk(aclk_out),

      .rd_reset(~aresetn_out),

      .*

    );

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

  //

  defparam axis_map_fifo_i.N=N; // why are these needed for recursive modules?

  defparam axis_map_fifo_i.I=I;

  defparam axis_map_fifo_i.D=D;

  defparam axis_map_fifo_i.U=U;

  defparam axis_map_fifo_i.USE_TSTRB=USE_TSTRB;

  defparam axis_map_fifo_i.USE_TKEEP=USE_TKEEP;

  defparam axis_map_fifo_i.W=W;

  axis_map_fifo

    // #(

      // .N(N),

      // .I(I),

      // .D(D),

      // .U(U),

      // .USE_TSTRB(USE_TSTRB),

      // .USE_TKEEP(USE_TKEEP),

      // .W(W)

    // )

    axis_map_fifo_i(.*);

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

  //

  assign axis_in.tready   = ~wr_full;

  assign wr_en            = axis_in.tvalid & ~wr_full;

  assign axis_out.tvalid  = ~rd_empty;

  assign rd_en            = axis_out.tready & ~rd_empty;

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

//

endmodule