Abstract: Placement legalization removes the overlap among cells after the global placement, and moves the cells to their final position. Macros make legalization harder to resolve in the mixed mode. According to the structure characteristics of macros,and considering the site constraint an algorithm for macros legalization was designed and implemented.The algorithm was tested on mPL6 global placement Experimental results show its reasonable quality compared with FastPlace.

Key words: Detail placement, Macro, Placement legalization, VLSI