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//

// dac_test.v -- test bench for DAC control circuit

//

`include "dac.v"

`timescale 1ns/1ns

module dac_test;

  reg clk;                        // system clock (50 MHz)

  reg reset_in;                   // reset, input

  reg reset_s1;                   // reset, first synchronizer

  reg reset;                      // reset, second synchronizer

  reg [15:0] sample_l;

  reg [15:0] sample_r;

  wire next;

  wire sck;

  wire sdi;

  wire ld;

  // instantiate the controller

  dac dac_1(clk, reset,

            sample_l, sample_r, next,

            sck, sdi, ld);

  // simulation control

  initial begin

    #0     $dumpfile("dump.vcd");

           $dumpvars(0, dac_test);

           sample_l = 16'h0FF0;

           sample_r = 16'hAA55;

           clk = 1;

           reset_in = 1;

    #145   reset_in = 0;

    #90000 $finish;

  end

  // clock generator

  always begin

    #10 clk = ~clk;               // 20 nsec cycle time

  end

  // reset synchronizer

  always @(posedge clk) begin

    reset_s1 <= reset_in;

    reset <= reset_s1;

  end

endmodule