#### dada999

##### Newbie level 3

Thanks in advance for your help!

I have synthesized my design in synopsys design vision, at first I create the clock to 10 ns, and the timing report showed that slack is 0, and the critical path is one bigger multiplier. Then I changed the clock to 4ns, this time it took me more time to synthesize my design(2 hours), then I still got 0 slack, but the critical path has changed to a another smaller multiplier. I really dont know what happened. It seems the first result about critical path is correct, but how to explain the second result?

Another problem is if I want to find out how fast my design can run, what should I do? Should I just set a very small clock cycle, and see the slack?