This page has documentation for the front panel board on the APOLLO blade service module. This is a small PCB which provides a reset/control button, USB console interface and uSD card.

• Photos: ​http://ohm.bu.edu/~hazen/APOLLO/gallery/FP/
• SVN: ​http://gauss.bu.edu/svn/common-atca-blade.hardware/Blade_FP
• ​http://ohm.bu.edu/~hazen/APOLLO/WebStuff/MPI_usb_sdcard.pdf

Notes for Rev D

(starting design March 2020):

• Rev C schematic: ​Blade_FP.pdf
• Would like to support SD 3.0. See for example the ​MPI_usb_sdcard.pdf schematic

Level translators:

• NVT4857UK - Looks promising, "auto-direction"
• IP4856CX25/CZ (MPI uses). Needs a bunch of extra signals.
• T6G3244ME

All are only available in a 0.4mm pitch BGA package and they claim you must use laser-drilled micro vias. We'd like to experiment with a layout using only mechanical (drilled) vias.