tb_asynfifo.v

异步FIFO模块： module asynfifo(rst,iclk,oclk,din,wren,rden,dout,full,empty) 异步FIFO的tenchbench： module

`timescale 1ns/1ns
`include  "asynfifo.v"
module   tb_asynfifo;
 reg         rst;
 reg         iclk;
 reg         oclk;
 reg  [7:0]  din;
 wire [7:0]  dout;
 wire        full;
 wire        empty; 
 wire        wren;
 wire        rden;
 integer     fh;
 integer     wh;
 //initiation
 asynfifo T_asynfifo(
           .rst(rst),
           .iclk(iclk),
           .oclk(oclk),
           .din (din) ,
           .wren(wren),
           .rden(rden),
           .dout(dout),
           .full(full),
           .empty(empty)
                    );
 //enable
 assign      wren = 1;
 assign      rden = 1;

 //rst
 initial
 begin
   rst = 1;
   #50 rst = 0;
 end
 
 //iclk
 initial    iclk = 0;
 always     #5  iclk = ~iclk;
 
 //oclk
 initial    oclk = 0;
 always     #10  oclk = ~oclk;
 
 //file initiation
 initial    fh=$fopen("asynfifo.v","r");
 initial    wh=$fopen("des.bak","w");
 //din
 always @(negedge iclk)
 begin
      wait (rst==0);
      if (wren&&!full)
         din = $fgetc(fh);
 end
 //dout
 always @(negedge oclk)
 begin 
       wait(rst==0);
       if (dout==8'hFF)
       begin
         $fclose(fh);
         $fclose(wh);
         $finish;
       end
       if (rden&&!empty)
         $fwrite(wh,"%c",dout);
 end
endmodule