//FILE NAME: test_afifo_2//AUTHOR:    jialiang`timescale 1ns/1nsmodule test_afifo;         parameter    DATA_WIDTH    = 8;  parameter    ADDRESS_WIDTH = 6;  parameter    FIFO_DEPTH    = 64;      reg   clk_read, clk_write, rst;  reg   read, write;  reg   [DATA_WIDTH-1:0] data_in;  wire  full,empty;  wire  [DATA_WIDTH-1:0] data_out;  initial #10000 $stop;  initial begin       rst =0;        #50 rst = 1;   end   initial begin         clk_read = 0;         forever #20 clk_read = ~clk_read;   end //25MHz  initial begin         clk_write = 0;         forever #8  clk_write = ~clk_write;   end//60MHz  initial begin            read =0 ;       write =0;       data_in = 0;   end  always begin        #7    write   <= $random;        #17   read    <= $random;  end        always @ (posedge clk_write or negedge rst)begin    if (!rst) begin        data_in <= 0;    end    else  begin       if (!full&write) begin           data_in <= data_in + 1;       end    end  end //always @ (posedge clk_write or negedge rst)  /*initial begin      repeat (50)    #40 read = ~read;      #40 repeat (100) #30 read = ~read;      #50 read = 1;  end  initial begin      #50 write = 1;      #2000 write = 0;      repeat (100)    #40 write = ~write;  end*/     aFifo_2 fifo(               data_out, empty,full,               data_in,clk_read,read,               clk_write,write,rst               );endmodule