Re: PAL18L8 Decompiling ??

[jzaghal]

decompile jedec

Hi to all,

Please, can you suggest a way to decompile a protected PAL18L8.
Is,giving all the combinations on the inputs, and monitoring the o/p's
enough to do that, since this is a combanitorial device ??

Thanks for feedback. :lol: :lol:

 

[sc/mp]

Hello

I ever saw 18P8 and 18V8 but never 18L8 !

According to the name it should be purely combinatorial
as you say, so try all input combinations and you have all
outputs.

Bye

 

[Ace-X]

I don't think that it is combinatorial. As far as I know output pins in these devices can be programmed to be registered, so the number of flip-flops in your case can be as many as 8. It means that this device can have up to 2^8=256 internal states. It will make you task much more harder to solve.

Good luck!

Ace-X.

 

[BENOIT]

two things;
if you have the Jedec of the PAL you can use the software
palasm there is a utility program that generate the equations of
the pal in correspondance to the pin names
if you have not the Jedec you have to use a tool as the PLD Analyzer
from RunFei (china) which allow you to retrieve with Approx. 99%
success the jedec of any secured PAL (up to 22V10)
this tool is very hard to find now but was available in the U.S a few
years ago;
you can get more details by looking at news:comp.arch.embedded
Archives ,
Most compilers come with a program to do that. The one I remember was called Jed2Eqn.exe this come for example with Opal Junior 2.1
from Harris Semiconductors,
@+
Regards,
MB.