`timescale 1us/1us

module fifo_tb (
);

reg clk_i;
reg rst_i;

reg read_i, write_i;
reg [7:0] data_i;

fifo #(
  .DATA_WIDTH(8),
  .DATA_DEPTH(8)
) uut(
  .clk_i(clk_i),
  .rst_i(rst_i),
  .write_i(write_i),
  .read_i(read_i),
  .data_i
);

string filename;
initial begin
`ifdef DUMP_FILE_NAME
  filename=`DUMP_FILE_NAME;
`else
  filename="fifo.lxt2";
`endif
  $dumpfile(filename); $dumpvars();
  clk_i <= 0;
  rst_i <= 1'b1;
  read_i = 0;
  write_i = 0;
  data_i = 0;
end

always #10 clk_i = ~clk_i;

initial begin
  #15

  for (integer run = 1; run < 3; run++) begin
  
    write_i = 1;
    for (integer addr = 0; addr < 10; addr++) begin

      data_i = (run << 4) | addr;
      #20
      ;
    end

    write_i = 0;
    read_i = 1;

    for (integer addr = 0; addr < 10; addr++) begin
      #20
      ;
    end

    read_i = 0;
    #20
    ;
  end
  #100
  $finish();
end

endmodule