XC9572 Readback

Hi!

I am facing a problem regarding Xilinx CPLD Readback. One of our
engineers left the country who designed the system back in 2000 and is
out of touch now. I have no idea where are the original design files
and the JEDEC files.

 However I do have two or 3 boards which have the working CPLD with the
code I need. I have no experience with a readback feature. Can anyone
help in this regard? I have a Xilinx PC4 cable and the ISE software.
Can I use it to readback the Jedec file from the CPLD? I have read in
the data sheet of XC9572 that it has data protection features. What
will I get if the device is protected?

Need your expert opinion.

Shabana

shabana_rizvi@yahoo.com schrieb:
> Hi!
> 
> I am facing a problem regarding Xilinx CPLD Readback. One of our
> engineers left the country who designed the system back in 2000 and is
> out of touch now. I have no idea where are the original design files
> and the JEDEC files.
> 
>  However I do have two or 3 boards which have the working CPLD with the
> code I need. I have no experience with a readback feature. Can anyone
> help in this regard? I have a Xilinx PC4 cable and the ISE software.
> Can I use it to readback the Jedec file from the CPLD? I have read in

Yes, if it is not read protected.

> the data sheet of XC9572 that it has data protection features. What
> will I get if the device is protected?

Rubbish or an error messeage. If the protection feature is set, you are 
lost.

And guys, no discussion here on reverse engineering. For such a device, 
its most probably ways faster and cheaper to redesign the CPLD (using 
the other system documents etc.) than to reverse engineer the CPLD by 
probing, etching etc.

Regards
Falk

P.S. Tststs, lost the source files AND the JEDEC. Not quite ISO 9000 
compliant. SCNR.