The wholechip floorplan is very important before you start the layout. u% K5 k! d/ {& q( f1 Z3 ^
Then the position of output pin are fixed for each sub block,and the line drawing will be smooth. % _, q. V ?- |& T% {; uFinally,the drc & lvs could be so easy to do . : F+ ]4 I9 b8 v- R+ u1 W( dBut the floorplan must be verified by designer.The thing of re-layout almost have not be happened.