Hi there, About the design I described in my last email to you (which hasnt been replied), I applied the "ring" instruction and got the ff output: $ ring chip chip @@@@@@@ @ @@@@ @ @@ @@ @@@ @@ @@ @@ @@ @ @@ @ @@ @@ @@@ @@@ @@ @@ @@ @@@@ @@@ @ @@ @@@@@ @@ @@ @@ @@ @@@@@ @@ @@ @@ @@ @@ @@ @ @@ @@ @@ @@ @@ @@ @@ @ @@ @@ @@ @@ @@ @@ @@ @@ @@ @@ @@ @@ @@ @@ @@ @@@@@ @@@ @@@@@@ @@@@ @@@@ @@@@ PAD ring router Alliance CAD System 4.5.0, ring 2.11 Copyright (c) 1991-2001, ASIM/LIP6/UPMC E-mail support: alliance-support@asim.lip6.fr o reading netlists, layout views of core and pads. o reading file of parameters, including the placements of pads. o making equipotential list. o making the first placement of pads. o filling data internal structures. o reading the connectors positions of the core. Distance between connector <y> and connector <sum> of the core isn't big enough. How do I rectify this error - increasing the distance between y and sum of the core. Here are the lines relating to both names: GENLIB_LOINS("xr2_y", "xr1", "x", "y", "sum", "vdd", "vss", 0); GENLIB_LOINS("a2_y", "an1", "x", "y", "carry", "vdd", "vss", 0); Thanks Giie --------------------------------- Do You Yahoo!? Check out Yahoo! Shopping and Yahoo! Auctionsfor all of your holiday gifts!