Генератор Verilog для КИХ-фильтров (простой метод)

module fir_filter_8_bit_4_points (clock, reset, enable, data, out);
	input clock;
	input reset;
	input enable;
	input [7:0] data;
	output [17:0] out;	
	
	wire [17:0] sum;
	
	reg [7:0] points [0:3];
	reg counter;

	wire [7:0] stored [0:3];
	assign stored[0] = 243;
	assign stored[1] = 100;
	assign stored[2] = 216;
	assign stored[3] = 104;

	
	assign out = sum;
	
	always @ (posedge clock)
	begin
		if (reset == 1'b1) begin
			points[0] = 0;
			points[1] = 0;
			points[2] = 0;
			points[3] = 0;
		end
		else if (enable == 1'b1) begin
			points[3] = points[2];
			points[2] = points[1];
			points[1] = points[0];
			points[0] = data;
		end
	end
assign sum = points[0]*stored[0] + points[1]*stored[1] + points[2]*stored[2] + points[3]*stored[3] ;
endmodule







module a_test_bench();
	reg clock, reset, enable;
	reg [7:0] data;
	wire [17:0] out;	
	
	integer expected = 0;

	fir_filter_8_bit_4_points ffilt (clock, reset, enable, data, out);
	
	// Initialize all variables
	initial begin        
	  $display ("time\t clk reset enable data out expected");
	  $monitor ("%g\t %b  %b  %b     %d     %d      %d", 
		  $time, clock, reset, enable, data, out, expected);	
	  clock = 1;       // initial value of clock
	  reset = 0;       // initial value of reset
	  enable = 0;      // initial value of enable
	  data = 0;        // initial value of data
	  #5 reset = 1;    // Assert the reset
	  #10 reset = 0;   // De-assert the reset
	  #10 enable = 1;  // Assert enable
	  #10 data = 160;
	  #10 data = 218;
	  #10 data = 55;
	  #10 data = 20;
	  #10 data = 0;
	  #10 data = 0;
	  #10 data = 0;
	  #10 data = 0;
	  #100 enable = 0; // De-assert enable
	  #5 $finish;      // Terminate simulation
	end

	// Clock generator
	always begin
	  #5 clock = ~clock; // Toggle clock every 5 ticks
	end

endmodule
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