The wholechip floorplan is very important before you start the layout. ' f- U. U6 F: u' ?) N& g4 s$ vThen the position of output pin are fixed for each sub block,and the line drawing will be smooth. ( f0 |$ l* u$ F6 u0 L9 CFinally,the drc & lvs could be so easy to do . * a8 Y6 R2 ^ G& I B1 i. l7 |But the floorplan must be verified by designer.The thing of re-layout almost have not be happened.