4-bit ALU

project/overflowDetect.v

@@ -0,0 +1,25 @@
+module overflowDetect (
+    input [1:0] opCode,
+    input [3:0] A, B,
+    input [4:0] Y,
+    output overflowDetect
+);
+
+wire opC,AandSum;
+wire sign1, sign2, sign3, sign4;
+wire detect1, detect2;
+
+or o1 (opC, opCode[0], opCode[1]);
+xor xo1 (AandSum, Y[4], A[3]);
+
+and a1 (sign1, A[3], B[3]);
+or o2 (sign2, opCode[0], sign1);
+
+xor a2 (sign3, A[3], B[3]);
+or o3 (sign4, opCode[1], sign3);
+
+or o4 (detect1, sign2, sign4);
+and a3 (detect2, AandSum, opC);
+and a4 (overflowDetect, detect1, detect2);
+
+endmodule