Actually HPC with LPC IO assignment and 8 x GTP links is popular configuration So you have 34 LVDS pairs and 8 GTP links.
If this works for you then I don’t have major objections. The other issue to consider is power rails, since for the analog circuitry we will probably want +/- 5V, +/- 15V as well as +3.3V, +1.8V, +12V. Can we put these through on the FMC without breaking back compatibility? For example, one rail on each of the 4 VADJ pins? I am sure this would not be VITA 57 compliant….and we don’t want switching converters on the FMC daughtercard for space and noise reasons both.
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