这里面的:
•Command (1) adds pessimism to the setup analysis by making the latching clock path 20 percent faster.
•Command (2) adds pessimism to the hold analysis by making the latching clock path 10 percent slower.
(1) set_timing_derate -max -early 0.8 -late 1.0
(2) set_timing_derate -min -early 1.0 -late 1.1