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Yoichi TOMIOKA †a) , Nonmember and Atsushi TAKAHASHI †b) , Member SUMMARY Ball Grid Array packages in which I/O pins are arranged in a grid array pattern realize a number of connections between chips and a printed circuit board, but it takes much time in manual routing. We propose a fast routing method for 2-layer Ball Grid Array packages that iteratively modifies via assignment. In experiments, in most cases, via assignment and global routing on both of layers in which all nets are realizeddoi:10.1587/transfun.e92.a.1433 fatcat:xrq3idpab5de5opbkx6yifuq7i