rearrangement

iverilog/tobb/labs/lab4/lab4.v

@@ -0,0 +1,22 @@
+module lab4(
+    input [8:0] signal,
+    output reg [3:0] S
+);
+
+always@(*) begin
+    S = 4'b0000;
+    if (signal[8] == 1) begin //First most significant bit -> sum
+        S = signal[5:3] + signal[2:0]; 
+    end
+    else if (signal[7] == 1) begin
+        S = signal[5:3] - signal [2:0];
+end
+    else if (signal[6] == 1) begin
+        S = signal[5:3] & signal [2:0];
+    end
+    else if (signal[6] == 0) begin
+        S = signal[5:3] | signal [2:0];
+    end
+
+end
+endmodule