The wholechip floorplan is very important before you start the layout.- J+ A) ?8 b0 A& n5 r/ U3 [( A
Then the position of output pin are fixed for each sub block,and the line drawing will be smooth.5 m K1 B! E' U2 p" I5 W; S
Finally,the drc & lvs could be so easy to do .9 V8 o" N+ I" Z% w6 o
But the floorplan must be verified by designer.The thing of re-layout almost have not be happened.