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BackHttps://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=289, NSMD pad definition Appendix A BGA 256 1 FT256 FTG256 Spartan-7 BGA, 15x15 grid, 13x13mm package, pitch 0.4mm; see section 7.7 of http://www.st.com/resource/en/datasheet/DM00330506.pdf WLCSP-100, 10x10 raster, 4.201x4.663mm package, pitch 0.8mm; see section 6.3.