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See figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic Thin Shrink Small-Outline Package, Body 3.0x3.0x0.8mm, Texas Instruments DSBGA BGA YZP R-XBGA-N8 Texas Instruments, DSBGA, 1.43x1.41mm, 8 bump 2x4 (perimeter) array, NSMD pad definition Appendix A BGA 1924 1 FF1926 FFG1926 FF1927 FFG1927 FFV1927 FF1928 FFG1928 FF1930 FFG1930 Virtex-7 BGA, 42x42 grid, 45x45mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=264, NSMD pad definition Appendix A BGA 400 0.8 CLG400 CL400 Zynq-7000 BGA, 26x26 grid.

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