async_fifo_tb_env.sv

system verilog fifo env

typedef enum {WR,RD} FAST_WRD;
parameter DSIZE = 8;
parameter ASIZE = 4;
parameter wclk_period = 0;
parameter rclk_period = 0;
parameter wrd_ratio = ((wclk_period/rclk_period)== 0) ? (rclk_period/wclk_period) : (wclk_period/rclk_period);
parameter wrd_selct_fast = ((wclk_period/rclk_period)== 0) ? 1'b0 : 1'b1;
int wrd_ratio_rand;
`include "async_fifo_tb_wr.sv"
`include "async_fifo_tb_rd.sv"
`include "async_fifo_checker.sv"
`include "async_fifo_defines.v"
class async_fifo_tb_env;

  rand FAST_WRD fast_wrd;
  virtual async_fifo_if async_fifo_inf;
  async_fifo_tb_rd async_fifo_tb_rd_o;
  async_fifo_tb_wr async_fifo_tb_wr_o;
  async_fifo_checker async_fifo_checker_o;

  function new (virtual async_fifo_if async_fifo_inf);
      if ((wclk_period/rclk_period)== 0)
         this.fast_wrd = WR;
      else
         this.fast_wrd = RD;
      this.async_fifo_inf = async_fifo_inf;
      async_fifo_tb_rd_o = new(async_fifo_inf, fast_wrd);
      async_fifo_tb_wr_o = new(async_fifo_inf, fast_wrd);
      async_fifo_checker_o = new(async_fifo_inf, fast_wrd);
      fork
      begin
         ratio_calc;
      end
      join_none
      async_fifo_inf.threshhold = 4;//3;
  endfunction : new

  task ratio_calc();

       while(1'b1)
       begin
          wrd_ratio_rand = ((async_fifo_inf.wclk_period_rand/async_fifo_inf.rclk_period_rand)== 0) ?
                               (async_fifo_inf.rclk_period_rand/async_fifo_inf.wclk_period_rand) :
                               (async_fifo_inf.wclk_period_rand/async_fifo_inf.rclk_period_rand);
          #1;
       end
  endtask
endclass

initial
begin
  wait(async_fifo_inf.end_of_sim);
  $display("no of emptys = %d", async_fifo_tb_program_U.async_fifo_tb_env_o.async_fifo_checker_o.no_of_fifo_empty);
  $display("no of fulls = %d", async_fifo_tb_program_U.async_fifo_tb_env_o.async_fifo_checker_o.no_of_fifo_full);
  $display("no of fulls and empties= %d", async_fifo_tb_program_U.async_fifo_tb_env_o.async_fifo_checker_o.no_of_fifo_empty_full);
  wait(1'b0);
end