CPLD program editing

Hi Group,

I need to edit a program loaded in a CPLD.I can read a JDEC file from
the CPLD.How can I convert that file into a readable program which I
can edit?

Thanks

abhi wrote:

> Hi Group,
> 
> I need to edit a program loaded in a CPLD.I can read a JDEC file from
> the CPLD.How can I convert that file into a readable program which I
> can edit?

Some may have a read protection. In the other
cases you can read the JTAG. How to convert
this into a readable diagram or code I wouldn't
know. Theoretically it would be possible.

Rene
-- 
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

"abhi" <akashya@gmail.com> schrieb im Newsbeitrag
news:1128002921.558736.158800@o13g2000cwo.googlegroups.com...
> Hi Group,
>
> I need to edit a program loaded in a CPLD.I can read a JDEC file from
> the CPLD.How can I convert that file into a readable program which I
> can edit?
>
> Thanks
>

assuming you have an succesful readback of non protected chip the conversion
*IS* possible. if it reasonable that depends.

for small GAL jed2eqn from Opal Jr (free download can be found with google)
does the job

For Xilinx XPLA3 we have a ready solution

http://shop.openchip.org/shop/product_info.php?cPath=2_27&products_id=37

For any other devices I think there are no existing solution at the moment

Antti