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X1-WLB0909, 0.89x0.89mm, 4 Ball, 2x2 Layout, 0.5mm Pitch, https://www.diodes.com/assets/Datasheets/AP22913.pdf WLCSP-4, 0.64x0.64mm, 4 Ball, 2x2 Layout, 0.5mm Pitch, http://www.ti.com/lit/ds/symlink/txb0104.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf BGA 12 0.5 R-XBGA-N12 Texas Instruments, DSBGA, area grid, NSMD pad definition Appendix A BGA 1156 1 FF1156 FFG1156 FFV1156 Virtex-7 BGA, 44x44 grid, 45x45mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=301, NSMD pad definition Appendix A.

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