Innovus - Cts

before ccopt

after ccopt

DAG 有向无序图

減小insertion dealy 的好處： OCV影響減小，remove unnecessary buffer， 做短net

reduce clock power -- sizedown clk buffer balance clock tree reduce clock skew fix clock tree overload

balance clock tree

extract rc,update timing

polish -- improving clock skew resize clock gate

refine-placement

routing 之前都是 estimate routing， 真正routing 用NANOROUTE

update IO latency 做完clock tree routing以後 用實際delay propageted clock

fix clock cell

selectNet -clock

redo ccopt_design for testing ultra cmds medium or high effort focus on fixing timing, the skew will be greater than low effort, but the timing should be better than low effort. the potential risk should be hold timing due to an unbalanced tree.