第四周 (二位元选择器) 行为结构

程序代码:module top;

  integer ia,ib,is,ic,id;
  reg  a0,b0,a1,b1,s;
  wire out0,out1;
mux_behavioral mux2(out0,out1,a0,b0,a1,b1,s);

  initial

    begin
      for (ia=0; ia<=1; ia = ia+1)
        begin

          a0= ia;

          for (ib=0; ib<=1; ib = ib + 1)

            begin

              b0 = ib;

              for (is=0; is<=1; is = is + 1)

                begin

                  s = is;

                  for (ic=0; ic<=1; ic = ic+1)

                    begin
                    a1 = ic;
                      for (id=0; id<=1; id = id+1)

                        begin

                        b1 = id;

                 #1 $display("a0=%d a1=%d s=%d b0=%d b1=%d  out0=%d out1=%d",a0,a1,s,b0,b1,out0,out1);

                        end

                    end

                end
            end
         end
      end
endmodule

module mux_behavioral(OUT0,OUT1, A, B,C,D, SEL);

 output OUT0,OUT1;

 input A,B,SEL,C,D;
 wire  A,B,SEL,C,D;
 reg    OUT0,OUT1;

  always @(A or B or SEL or C or D )

  begin
     OUT0= (A & ~SEL)|(B & SEL );
     OUT1= (C & ~SEL)|(D & SEL );
  end
endmodule