I'm an applications engineer for a company that makes Ethernet controllers and PHYs. Some of our customers use crystals (more often oscillators) that they selected based on price rather than performance. when i'm debugging a customer issue replacing the clock source with a synthesizer is a good troubleshooting aid. I's also useful when trying to prove that a low quality clock source (or clock distribution network) in a link partner is producing a poor (usually jittery) output that makes it hard for our parts to achieve link.
On Fri, Nov 30, 2012 at 5:06 PM, Jim Welch <[email protected]> wrote: > OK, I'll bite. Why? > > Jim > > >>>I've never done it using to the RTC crystal, but I do it quite > frequently in my Day Job to >>>Ethernet controllers on those same pc mother > boards. > >>> > >>>-Eric > > On Fri, Nov 30, 2012 at 4:10 PM, Sarah White <[email protected]> wrote: > > > On 11/30/2012 6:30 PM, Eric Garner wrote: > > > the actual RTC on modern (Intel based) PC's is driven from a > > > standard > > > 32,768 Hz crystal attached to the PCH. some of them are in > > > incredibly > > small > > > packages now instead of the old tuning fork-in-a-can ones. peeling > > > off > > the > > > load caps and crystal from the board would allow you plenty of > > > spaces to tack down a lead from an external synthesizer. > > > > Yeah, the one on the (Soekis) example was pretty small. So far none of > > of the replies have indicated that anyone on here has experience > > beyond an embedded system. > > > > Mostly I started this thread because there have been a few with people > > discussing implementing NTP on embedded microcontrollers, arduino, etc. > > and I was thinking of doing it from the other side (turning a nice-ish > > server into a rock-solid timekeeper) > > > > Thanks so far everyone. Really impressed that I already managed to get > > 4x replies so quickly :) > > > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > -- > --Eric > _________________________________________ > Eric Garner > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- --Eric _________________________________________ Eric Garner _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
