The wholechip floorplan is very important before you start the layout. ! s" n0 S7 l: R$ ZThen the position of output pin are fixed for each sub block,and the line drawing will be smooth. + \5 b6 H# L' k ^Finally,the drc & lvs could be so easy to do . : p0 b- a3 T& _0 J! s7 S |, \But the floorplan must be verified by designer.The thing of re-layout almost have not be happened.