3. (10 points) Textbook Problems 4.44 4.44 Using a case statement, write an HDL behavioral description of a eight-bit arithmetic- logic unit (ALU). The circuit has a three-bit select bus (Sel), sixteen-bit input datapaths (A[15:0] and B[15:0]), an eight-bit output datapath (y[15:0), and performs the arithmetic and logic operations listed below Operation y 8'b0 y A& B Sel Description 001 010 011 100 101 110 Bitwise AND Bitwise OR Bitwise exclusive OR Bitwise complement Subtract Add (Assume A and B are unsigned) y ~A y8'hFF