//2023-10-18 姜青羊
//assign语句实现二选一逻辑

`timescale 1ns/10ps
module fn_sw (
                a,
                b,
                sel,
                y
             );

input           a,b;
input           sel;
output          y;    

assign          y = sel?(a^b):(a&b);
  
endmodule


//-------testbench----------

module tb_fn_sw ();

reg            aa,bb,ss;
wire           yy;

initial begin
              ss = 1;aa = 0; bb = 0;
        #10   ss = 1;aa = 0; bb = 1;
        #10   ss = 1;aa = 1; bb = 0;
        #10   ss = 1;aa = 1; bb = 1;
        #10   ss = 0;aa = 0; bb = 0;
        #10   ss = 0;aa = 0; bb = 1;
        #10   ss = 0;aa = 1; bb = 0;
        #10   ss = 0;aa = 1; bb = 1;
              $stop;
end

fn_sw u_fn_sw (
                .a(aa),
                .b(bb),
                .sel(ss),
                .y(yy)
             );
    
endmodule