1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
/*
* A simple test of some of the structural elements.
*/
module testbench;
wire o;
reg i0, i1, sel;
mux2 uut(o, i0, i1, sel);
initial begin
i0 <= 1;
i1 <= 0;
sel <= 0;
#1;
sel <= 1;
#1;
i1 <= 1;
#1;
end
always @(o)
$display(o);
endmodule // testbench
module mux2(c, a, b, s);
input a, b, s;
output c;
wire s_bar, a_and_s_bar, b_and_s;
not(s_bar, s);
and(a_and_s_bar, a, s_bar);
and(b_and_s, b, s);
or(c, a_and_s_bar, b_and_s);
endmodule // mux2
|
