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

[Tom Wimmenhove]

It's a chip (PSD813F) which has 1MBit flash, 16Kbit SRAM and 256Kbit
EEPROM. It's old school with parallel data/address bus and all that :) It
does have JTAG.

Regards,
 Tom

On Sat, Oct 11, 2014 at 7:45 AM, Didier Juges <shalimr9 at gmail.com> wrote:

> 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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