Hi all,
I'm working (slowly) on a Rspi4b to 7i90 to 5i33 system. After a few
speed bumps ( I ordered the wrong connector) I think I have things
worked out. The geometry isn't pretty but should work .... unless my
cognition has drifted off into never-neverland.
So 40 pin idc plugs into spi bus and solders to the jepler interface
board (osh-park). 26 pin on the jepler board (solder connection) plugs
into the 7i90. This looks weird since the Rpi4 is at rt angles to the
7i90 but a bit of creative milling of aluminum will at least mount it
securely. Plans are for a 60 mm cooling fan.
Now the question. What is the probably impedance across these connectors
and do I need the smd resistors? Do I need to match the impedance or
just load the lines? Gene is using 88 ohm grain of wheat resistors. The
pads are for smd ... like 1206 (imperial). Connectors in general unless
they are very good have an impedance bump anyway.
This would be cleaner with a rt angle 26 pin but they were weeks out. ;-)
Maybe Peter will chime in here. :-)
Dave
ps. if one gets a 929852-01-10 then you can split it into the 40 pin and
the 26 pin. Don't ask me how I know. ;-)
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