[time-nuts] FE-5680A Mechanical Question

[Bob Camp]

Hi

You could do a "push button before unplugging" sort of thing. Only write it
on command. That way the eprom would last forever ...

Once an hour for a year would be 8760 writes. If it's a true eprom, that
should be no problem. If it's rewriting flash, that could get exciting. I
wonder if there's an eprom chip on the board / embedded eprom in a cpu or
not... 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Albertson
Sent: Thursday, January 12, 2012 12:18 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question

On Thu, Jan 12, 2012 at 9:10 AM, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> One consideration is weather / when the FE writes the DDS setting to
> internal EPROM. You can easily wear out an EPROM if it's writing every
time
> the DDS is updated. On the flip side, having the EPROM save the last
correct
> value might make the "unplug and walk around" part a bit easier.

The user FE5680 manual suggests to write to EPROM once an hour.  I
might do that or I might have  the controller detect the "unplug"
event and then write to EPROM.     Likely we don't change the offset
more more then one every few hours if even that.

Either way I think the rule is write no more then once every hour or so.

Chris Albertson
Redondo Beach, California

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