synth_tools

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0.8mm Altera BGA-68 M68 MBGA Altera UBGA U169 BGA-169 BGA-200, 14.5x10.0mm, 200 Ball, 12x22 Layout, 0.8x0.65mm Pitch, http://www.issi.com/WW/pdf/43-46LQ32256A-AL.pdf Altera BGA-256 M256 MBGA BGA-256, dimensions: https://www.xilinx.com/support/documentation/package_specs/ft256.pdf, design.

1.46714 6.0001 facet normal 0.466834.
// knob_radius_top = 16; // Bottom radius.
-0.50788 0.489712 0.708689 vertex -4.69512 5.64771.
Normal 4.821120e-16 -4.316724e-15 1.000000e+00.
-4.64918 21.7467 vertex -3.27291 3.27291 21.7443.

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