4-bit ALU

project/addition.v

@@ -0,0 +1,13 @@
+module addition (
+    input [3:0] A, B,
+    output [4:0] Y
+);
+
+wire [3:0] Carry4;
+
+halfadder h1(.A(A[0]), .B(B[0]), .Sum(Y[0]), .Carry(Carry4[0]));
+fulladder f1(.A(A[1]), .B(B[1]), .Carry(Carry4[0]), .Sum(Y[1]), .CarryO(Carry4[1]));
+fulladder f2(.A(A[2]), .B(B[2]), .Carry(Carry4[1]), .Sum(Y[2]), .CarryO(Carry4[2]));
+fulladder f3(.A(A[3]), .B(B[3]), .Carry(Carry4[2]), .Sum(Y[3]), .CarryO(Y[4]));
+
+endmodule