系統時脈模組

１module mux(OUT, A, B, SEL);
２output OUT;
３input A, B, SEL;
４
５not I5 (sel_n SEL);
６and I6 (sel_a, A, SEL);
７and I7 (sel_b, sel_n, B);
８
９or I4 (out, sel_a, sel_b);
10 endmodule