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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, 3.639x3.971mm package, pitch 0.4mm; see section 6.1 of.

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