Thanks for the info, John. I thought it might have something to do with
that. If I get a chance I'll have to pick up that book - thanks for the
suggestion!
I see in the earlier BBB designs the GND_OSC wasn't connected to the main
DGND. Only later were they connected (via those zero ohm resistors), and
that apparently helped the BBB function better. To me it seems that would
introduce more switching noise (as John put it) than leaving them not
connected to DGND. I guess I'm a little confused about John's use of the
word "isolated" ("If you don’t isolate the OSC gnd...") - were you
suggesting the zero ohm resistors acted as isolation from digital ground in
this case?
Gerald - do you mean that I could connect the GND_OSC net to the DGND net
directly, or were you saying that I didn't need to connect those two at all
(as in the earlier versions of the BBB)? What's the reason for having the
resistors on the BBB if they're not needed? I was speculating that maybe
you weren't initially sure if connecting the ground nets together would
solve the "ground bounce" problem or maybe introduce worse problems, so you
used those resistors to allow yourself the ability to leave them
unpopulated in the event that it caused more issues than it solved (rather
than re-spin new boards without the connection at all).
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