I’m going through the specs (great work, btw!) in preparation for designing a mezzanine board, and have a couple of questions:
It would be very useful to also get distances from board edge to the vertical axis of each expansion board connector. Currently, distances are given to the horizontal axis and to the axis of the first pin. Many footprints are not anchored to the axis of the first pin, which makes positioning more difficult and prone to errors.
Page 27 reads: “The board to mezzanine module spacing is 7.0mm, or optionally 8.0mm (depending on the mezzanine module connectors used).”
So, which is it? 7mm or 8mm?
Also, it would be very, very helpful if you could provide the exact part numbers for recommended connectors, especially the high-speed one. Ideally I’d love to see an example reference mezzanine board in KiCad, containing just the board outline, holes, and two properly positioned connectors with footprints. This would go a long way towards accelerating development of mezzanine boards.