`default_nettype none

module tb_DiffWidthSyncFIFO;
  localparam reg [7:0] DATA_WIDTH = 8;
  localparam reg [7:0] DATA_DEPTH = 12;
  localparam reg [7:0] READ_DEPTH = 3;
  localparam reg [7:0] WRITE_DEPTH = 4;
  reg clk;
  reg reset;
  reg write_en;
  reg [DATA_WIDTH  - 1 : 0] write_data[WRITE_DEPTH];

  wire read_en, write_ready, read_ready;
  wire [DATA_WIDTH  - 1 : 0] read_data[READ_DEPTH];


  DiffWidthSyncFIFO #(
      .DATA_WIDTH (DATA_WIDTH),
      .DATA_DEPTH (DATA_DEPTH),
      .READ_DEPTH (READ_DEPTH),
      .WRITE_DEPTH(WRITE_DEPTH)
  ) inst_fifo (
      .clk  (clk),
      .reset(reset),

      .read_ready(read_ready),
      .read_en(read_en),
      .read_data(read_data),

      .write_ready(write_ready),
      .write_en(write_en),
      .write_data(write_data)
  );

  localparam CLK_PERIOD = 10;
  always #(CLK_PERIOD / 2) clk = ~clk;

  initial begin
    $dumpfile("tb_DiffWidthSyncFIFO.vcd");
    $dumpvars(0, tb_DiffWidthSyncFIFO);
  end

  assign read_ready = read_en ? 0 : 1;

  integer j;
  initial begin
    clk = 0;
    reset = 1;
    write_en = 0;
    for (j = 0; j < WRITE_DEPTH; j = j + 1) begin
      write_data[j] = 0;
    end
  end

  integer i;
  initial begin
    #(10 * CLK_PERIOD) reset = 0;
    for (i = 0; i < 20; i = i + 1) begin
      #CLK_PERIOD
      for (j = 0; j < WRITE_DEPTH; j = j + 1) begin
        write_data[j] = {$mti_random} % (32'b1 << DATA_DEPTH);
      end
      write_en = 1;
      #CLK_PERIOD write_en = 0;
    end

    $finish(100 * CLK_PERIOD);
  end


endmodule
`default_nettype wire