Re: A very hard problem for me. FLASH ROM write fail!

We didn't encounter this problem when we are in design phase, on mass
production phase, we got this problem, and it is very hard to debug,
because some FLASH rom fail and some not, the H/W,S/W are both the
same... I still don't know that is a S/W or H/W problem now...

Another problem is I can't guarantee every FLASH rom will fail after N
times upgrade. Sometims I guess that is a FLASH manufacture problem,
but I know that is almost impossible.

Our programmer is control by embedded system CPU/firmware.

I have no chance to changed ROM manufacturer...

If the ROM is programmed inside your product, has your product changed
?
Yes, of course, but sometims it will fail on some
bits/blocks(1024bytes), the result is my system will fail to start up.

Roger Lascelles wrote:
> <bokiteam@xxxxxxxxxxxxxx> wrote in message
> news:d9rv0t$gav$1@xxxxxxxxxxxxxxxxxxxx
> > Hi All,
> > If your FLASH rom sometimes will write wrong data, how will you
> > debug it?
> >
> > The firmware was used for a long time........with no problem..
> >
> >
> > We got some flash rom data have regular difference ( for example, if the
> > update data is 0, but the flash save data is 3, if the update data is 2,
> but
> > the flash save data is 5), but some part/secotr they are all correct, but
> > some part they are all wrong, what I can sure is the data on the begging
> has
> > regular difference.
> >
> > Could you please adivce? I don't know how to debug it....
>
> We need to know what part and manufacturer you are using and what you use to
> program it. How often does a ROM show an error ? If a part is not
> programming correctly, you are looking at a poor quality batch, or trouble
> with timing, programming algorithm or voltages.
>
>
> To isolate the cause, you often have to change things out until the problem
> goes away -
>
> - A basic step is to find if the fault isin the ROM part itself, or the
> programming hardware?
>
> - If you use a programmer, buy, rent or borrow another programmer and see if
> that solves the problem.
>
> - If you have changed ROM manufacturer, can you try some of the parts you
> used earlier, or another manufacturer ?
>
> - If the ROM is programmed inside your product, has your product changed ?
>
>
>
> Roger Lascelles

.

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