logic level leveling between the FCDEV3B kits UARTs and 3.3V interfaces.

[Kent del Pino]

Just a little thing, since I did cables this weekend for the FCDEV3B board.
I have only seen the PCB on my table, not the schematics.


If one is using a FTDI FT2232D unit, you have, between an output-pin(the
generator) and the input-pin's protective diodes to Vcc, a difference of
almost 0.5V.


I think it's a good idea to limit the current in the UART signals with
resistor at about 100 ohm in series.


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