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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  Low Pass Filter FIR IP Core                                 ////

////                                                              ////

////  This file is part of the LPFFIR project                     ////

////  https://opencores.org/projects/lpffir                       ////

////                                                              ////

////  Description                                                 ////

////  Implementation of LPFFIR IP core according to               ////

////  LPFFIR IP core specification document.                      ////

////                                                              ////

////  To Do:                                                      ////

////  -                                                           ////

////                                                              ////

////  Author:                                                     ////

////  - Vladimir Armstrong, vladimirarmstrong@opencores.org       ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2019 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

// Verilog test bench

module bench (

              input clk,

              input rst

              );

   // Test case #1: check impulse response of low-pass filter.

   logic [15:0]     in = (count == 1) ? 1:0;

   logic [15:0]     out;

   reg [31:0]       count;

   always_ff @(posedge clk or posedge rst)

     if (rst)

       count <= 0;

     else

       count <= count + 1;

   // unit under test(UUT)

   lpffir_core lpffir_core(.x_i(in),.clk_i(clk),.y_o(out));

   // Test case log

   initial begin

      $display("Test Case #1:");

      $display("Check impulse response of low-pass filter.");

      $display("RTL simulation results:");

      $display("Input Output");

      $display("----- ------");

   end

   always_ff @(posedge clk or posedge rst)

     if(!rst)

       $display("  %0d     %0d", in, out);

endmodule