The wholechip floorplan is very important before you start the layout. ' g( d. w0 o* v0 f! Y' ~Then the position of output pin are fixed for each sub block,and the line drawing will be smooth. , U# r t# I$ { I9 n( ^2 fFinally,the drc & lvs could be so easy to do . % n. R; R0 u/ `; r8 a3 T. zBut the floorplan must be verified by designer.The thing of re-layout almost have not be happened.