All the more reason to just observe the log and manually select the value to burn in, IMHO. If you happen to see that the discipline is alternating between adjacent values, then you can "de-dither" by adding back the two lost resolution bits and selecting the correct low-bits by interpolation.
Sent from my iPhone > On May 21, 2016, at 3:00 PM, Chris Albertson <albertson.ch...@gmail.com> > wrote: > > You SHOULD never have to write very frequently to the EEPROM. As long at the > 5680 is connected to the GPS you don't have to write to the EEPROM at all. > Only time you'd need to write is just before it is disconnected. Will you do > that even three times a week. > > The unit that discipline the 5680 would have a "shutdown" button on it, when > pressed it would turn itself off but just before would write the best EFC > value to the EEPROM. That would likely be the average EFC over the last > several days. If a 5680 is used in a disconnected hold over mode you's like > it to be programmed with an EFC value that will work best over a long hold > over. This might not be the same EFC value that was sent to the 5680. > >> On Sat, May 21, 2016 at 8:37 AM, Nick Sayer via time-nuts >> <time-nuts@febo.com> wrote: >> You're right. The EEPROM of concern is the one in the 5680. Since they're >> used, you have no idea how many writes they've already endured (likely a low >> number), and they're quite old. >> >> Sent from my iPhone >> >> > On May 20, 2016, at 3:20 PM, paul swed <paulsw...@gmail.com> wrote: >> > >> > Mark >> > By todays standards yes. But they were not that great 10 years ago. >> > So I may be crossing wires. I am speaking off the eeprom in the 5680 and I >> > think you are speaking to the one in the AVR. That would be of the modern >> > type. >> > Regards >> > Paul >> > WB8TSL >> > >> >> On Fri, May 20, 2016 at 5:31 PM, Mark Sims <hol...@hotmail.com> wrote: >> >> >> >> I think the EEPROM in AVR chips is rated at 100,000 writes. Several >> >> people have tested them and most found they would survive at least 5 >> >> million writes... YMMV, of course. >> >> ------------------------ >> >> One write every 24 hours is still under >> >> 10K writes in a reasonable lifespan for a GPSDO. It’s a rare eeprom that >> >> is rated that low. >> >> _______________________________________________ >> >> time-nuts mailing list -- time-nuts@febo.com >> >> To unsubscribe, go to >> >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >> and follow the instructions there. >> > _______________________________________________ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > > -- > > Chris Albertson > Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
