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7.3mm x 6.25mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for ECP5 FPGAs, based on the GitHub page (they'll have "@ something" after them) and download them as separate sheet initial kicad project.

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