//-----------------------------------------------------------------------------//  //  Copyright (c) 2009 Xilinx Inc.////  Project  : Programmable Wave Generator//  Module   : tb_resp_checker.v//  Parent   : tb_uart_rx, tb_wave_gen//  Children : none////  Description: //    This testbench module checks the data received from the DUT against//    the data stored in a FIFO////  Parameters: ////  Tasks://    start_chk        : Enables the checker////  Functions:////  Internal variables://    reg    enabled;//    ////  Notes       : //    ////  Multicycle and False Paths//    None - this is a testbench file only, and is not intended for synthesis//// All times in this testbench are expressed in units of nanoseconds, with a // precision of 1ps increments`timescale 1ns/1psmodule tb_resp_checker (  input [7:0] data_in,    input       frm_err,  input       strobe);//***************************************************************************// Parameter definitions//***************************************************************************//***************************************************************************// Register declarations//***************************************************************************    reg               enabled = 1'b0;  reg  [7:0]        my_data;  reg  [7:0]        char_received;//***************************************************************************// Tasks//***************************************************************************  // Enables the checker   task enable;    input new_enable;  begin    enabled = new_enable;  end  endtask  task is_done (  );  begin    if (!tb.tb_char_fifo_i0.is_empty(1'b0))      $display("%t ERROR Data FIFO is not empty when expected",$realtime);  end  endtask//***************************************************************************// Code//***************************************************************************  always @(posedge strobe)  begin    if (enabled)    begin      my_data = tb.tb_char_fifo_i0.pop();      char_received = data_in;      #1; // Wait to ensure that the output data is valid after the rising          // edge of the strobe      if (data_in !== my_data)      begin         $display(           "%t ERROR Character mismatch. Expected %x (%c), received %x (%c)",           $realtime, my_data, my_data, data_in, data_in);      end      else      begin         $display("%t       Character received %x (%c)", $realtime, my_data,my_data);      end    end // if enabled  end // always   always @(posedge frm_err)  begin    if (enabled)    begin       $display("%t ERROR Frame Error Detected", $realtime);    end // if enabled  end // always endmodule