Gate Delays
Rise Delay - transition from 0, x, or z to a 1
Fall Delay - transition from 1, x, or z to a 0
Turn-off Delay - tranzition from 0, 1 or x to a z
and #(2) u1 (co, a, b); // Delay of 2 for all transitions
and #(1, 3) u2 (co, a, b); // Rise = 1, Fall = 3
bufif0 #(1, 2, 3) u3 (out, in, enable) ;
// Rise = 1, Fall = 2, Turn-off = 3
<component_name> #(Rise, Fall, Turnoff) <instance_name> (port_list);