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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; see section 7.6 of http://www.st.com/resource/en/datasheet/DM00257211.pdf WLCSP-64, 8x8 raster.

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