[time-nuts] FE-5680 Linux command line tool

[Tom Wimmenhove]

Thanks Joe!

I don't have the clip-ons but of course I could get them. I know the chip
has a JTAG interface, but I've only used JTAG with chips that came with a
programmer and software :) (except with OpenOCD over parport once, but that
was in the stone age).

Another question about the EEPROM dump Elio Corbolante. The chip has a
256Kbit (32KB) EEPROM and the dump is 160K:
-rw-rw-r-- 1 tom tom 160K nov  8  2012 FE5680A_EEPROM.bin

Which part in this dump is the actual data from the EEPROM?

Thanks in advance.

Regards,
 Tom



On Fri, Oct 10, 2014 at 12:21 PM, Joseph Gray <jgray at zianet.com> wrote:

> I don't know how crowded the board is, but I would use an SMD DIP clip
> instead of unsoldering the chip.
>
> Joe Gray
> W5JG
>  On Oct 10, 2014 8:30 AM, "Tom Wimmenhove" <tom.wimmenhove at gmail.com>
> wrote:
>
> > I recently came across a thread on this list about undocumented FE5680
> > commands. I have been using a little linux command line tool I wrote
> years
> > ago for tuning the unit and decided to add these commands to it.
> > Since this mailing list was the place I found the unit (someone linked to
> > an ebay seller) I figured I' d join the list and throw it on here :)
> > http://www.tomwimmenhove.com/otherstuff/fe5680-0.2.tgz
> >
> > Now, the bad news. I had my unit running overnight while logging the
> serial
> > command output that reads the ADC, and in the morning it was no longer
> > locked. The 10MHz signal disappears about 5 seconds after power-on, and
> > programmed offset was somehow reset to zero (it had been set to -645). So
> > it appears as if the internal EEPROM has been corrupted.
> > I read a post from Elio Corbolante where he posted EEPROM and firmware
> > dumps. Anyone have any idea on how to re-write this firmware back into
> the
> > EEPROM by hand (would this be possible through JTAG, or do I actually
> have
> > to solder the chip out of there? :) ) Or maybe there's someone willing to
> > sell their broken unit I could take the chip out of?
> >
> > Regards,
> > Tom
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