更新decoder2to4：改良

decoder2to4/GNU_toolchain/Makefile

@@ -1,6 +1,12 @@
+#Makefile of 2 to 4 line decoder
+  #author:Vdragon(pika1021@gmail.com)
+  #this file is licensed under LGPL 3 or later
 build:
-	iverilog -o Simulation/decoder2to4.executable Source_code/test.tbw
-
-test:
-	Simulation/decoder2to4.executable
-	gtkwave Simulation/decoder2to4.vcd
+	mkdir --parents Simulation
+	iverilog -o Simulation/decoder2to4_tb.executable Source_code/decoder2to4_tb.v
+
+simulate:
+	Simulation/decoder2to4_tb.executable
+
+wave:
+	gtkwave Simulation/decoder2to4_tb.vcd

decoder2to4/GNU_toolchain/Source_code/decoder2to4/decoder2to4.v

@@ -1,20 +1,23 @@
 /* 模組名稱： 2 to 4 line decoder
    著作權宣告：copyright 2012 林博仁(pika1021@gmail.com)
    */
-`timescale 1ns / 1ps
-`include "Source_code/decoder1to2/decoder1to2.v"
+`ifndef DECODER2TO4_V_INCLUDED
+	`define DECODER2TO4_V_INCLUDED
+	`timescale 1ns / 100ps
+	`include "Source_code/decoder1to2/decoder1to2.v"
 
-module decoder2to4(o0, o1, o2, o3, i1, i0);
-  input i1, i0;
-  output o0, o1, o2, o3;
-  wire a0, a1, b0, b1;
-  decoder1to2 
-    dec12a(a1, a0, i0),
-    dec12b(b1, b0, i1);
-  and
-    and00(o0, b0, a0),
-    and01(o1, b0, a1),
-    and10(o2, b1, a0),
-    and11(o3, b1, a1);
-
-endmodule
+	module decoder2to4(o, i);
+		output [3:0]o;
+		input [1:0]i;  
+		wire a0, a1, b0, b1;
+		decoder1to2 
+			dec12a(a1, a0, i[0]),
+			dec12b(b1, b0, i[1]);
+		and
+			and00(o[0], b0, a0),
+			and01(o[1], b0, a1),
+			and10(o[2], b1, a0),
+			and11(o[3], b1, a1);
+
+	endmodule
+`endif

decoder2to4/GNU_toolchain/Source_code/decoder2to4_tb.v

@@ -0,0 +1,26 @@
+//2對4解碼器的testbench
+`timescale 1ns / 1ps
+`include "Source_code/decoder2to4/decoder2to4.v"
+module decoder2to4Test;
+  reg [1:0] i;
+  wire [3:0] o;
+
+  //D.U.T.實體化
+  decoder2to4 dec24(o, i);  
+
+  initial 
+  begin
+    $dumpfile("Simulation/decoder2to4_tb.vcd");
+    $dumpvars;
+		$monitor($time, " i=%2b -> o=%4b", i, o);
+    i = 2'b00;
+
+    #10 i = 2'b01;
+    #10 i = 2'b10;
+    #10 i = 2'b11;
+
+    #10;
+    end
+
+
+endmodule