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

[Didier Juges]

Most EEPROMs have I2C or SPI interfaces. Some Flash chips have JTAG.

Didier KO4BB

On October 10, 2014 4:47:19 PM CDT, Tom Wimmenhove <tom.wimmenhove at gmail.com> wrote:
>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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>> >
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