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Thermal vias, http://www.ti.com/lit/ds/symlink/drv8870.pdf 20-Pin Thermally Enhanced Thin Shrink Small-Outline Package, Body 4.4x6.5x1.1mm, Pad 3.0x4.2mm, Texas Instruments DSBGA BGA YZR0009 Texas Instruments, DSBGA, 1.5195x1.5195x0.600mm, 8 ball 3x3 area grid, YZR pad definition Appendix A BGA 225 0.8 CSGA225 Spartan-7 BGA, 14x14 grid, 8x8mm package, 0.5mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=266, NSMD.

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