The wholechip floorplan is very important before you start the layout.: x9 c1 Z* d9 v5 K) y. z
Then the position of output pin are fixed for each sub block,and the line drawing will be smooth. 3 I0 [0 z# S, W% o; \+ D: iFinally,the drc & lvs could be so easy to do .: X% H Q4 f W- R) @: m! C) ?; v
But the floorplan must be verified by designer.The thing of re-layout almost have not be happened.