VHDL Problem set 3

ps3/ps03q/tlc_tb.v

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+///////////////////////////////////////////////////////////////// 
+// Author - Imants Pulkstenis
+// Date - 23.02.2020
+// Project name - PS03
+// Module name - Testbench for Smart traffic light controler
+//
+// Detailed module description:
+//
+// Generating the stimulation 
+// Clk - Generate the 1GHz clock input 
+// Rst - generate both high and low reset to ensure correct start up, per Required functionality 
+// MR_cars - generate multiple values to simulate real world traffic situation (e.g. at night some 
+// cars arrive once per 60nanoseconds, in day – more cars) and verify that smart traffic light controller is working correctly. 
+//
+// The test can be executed using Icarus Verilog!
+// The result can be evaluated in GTKwave application.  
+// Code:
+//     iverilog -o output.vvp tlc_tb.v && vvp output.vvp
+//     gtkwave -f wave.vcd
+//
+// Revision:
+// A - initial design
+// B - 
+// C - 
+//
+///////////////////////////////////////////////////////////////////
+
+//UUT module
+`include "traffic_light_controler.v"
+
+// 1GHz clock -> 1ns period
+// 50% duty cycle 0.5ns HIGH and 0.5ns LOW
+// `timescale [time unit] / [time precision]
+`timescale 1ns / 100ps
+
+//define module 
+module tlc_tb ();
+
+//define inside use signals
+reg         clk     = 1'b0;
+reg         rst     = 1'b1;
+reg [7:0]   MR_cars = 'b0;
+
+integer ii=0;
+
+//---------Test script----------------
+// 50% duty cycle clock
+always #0.5 clk <= ~clk;
+
+//-----Unit Under test---------------
+smart_tl_ctl #(
+        .PARAMETER(45)
+) unit_under_test (
+        .clk(clk),
+        .rst(rst),
+        .MR_cars(MR_cars),
+        .MR_ctl(),
+	    .SR_ctl());
+
+//---------Reset Test--------------------
+initial begin
+    rst = 0;
+    #10;
+    rst = 1;
+    #200
+    rst = 0;
+    #100;
+    rst = 1;
+    
+end
+
+
+initial
+    begin
+    //---------Daytime traffic Test--------------------
+      for (ii=0; ii<50; ii=ii+1)
+        begin
+          MR_cars = ii;
+          #10;
+        end
+      MR_cars = 0;
+      #100;
+      //---------Nighttime traffic Test--------------------
+      for (ii=0; ii<50; ii=ii+1)
+        begin
+          MR_cars = ii;
+          #60;
+        end
+      #100;
+      $finish();
+    end
+
+// just print text 
+initial begin 
+    $display(" ");
+    $display("----------------------------------------------");
+    $display("          Starting Testbench...");
+    $dumpfile("wave.vcd");
+    $dumpvars(0);
+    $display("----------------------------------------------");
+    $display(" ");
+end
+
+endmodule