General Description: When I specify two clocks in a command script using the "clock and step size" method, only one clock is used for both signals in simulation.
In the example above, the step size may only have one value -- it will keep the value of the last definition (3.35ns in this case). Multiple clocks can be defined with the same step size.
This creates a clock with three High pulses of different lengths (5 ns, 10 ns, 15 ns) that are separated by 10 ns Low pulses. This sequence will repeat for the length of the simulation.