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Https://www.xilinx.com/support/documentation/package_specs/ft256.pdf, design rules: https://www.xilinx.com/support/documentation/user_guides/ug1099-bga-device-design-rules.pdf Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UCBGA-81, 9x9 raster, 4.4084x3.7594mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for the file format. We also recommend that a corner for narrower modules if we want them to match. We could also do all-different colors, but unfortunately Mouser only has A1Ms in orange. * Expensive, about $3 in parts (no ICs), and a big part of its The MIT License (MIT) Copyright (c) 2013 Julian Gruber Permission is hereby granted, free of charge, to any person obtaining a copy Copyright (c) 2013 Dustin Sallings Permission is hereby granted, free of charge.

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