finding code from pal

[Revanth Machineni]

hello, is it possible to find what coding does a PAl ic consists of. If possible can anyone tell me the way to find out the code inside PAL. i have to work on pal 16v8 and pal 22v10.

 

[FvM]

PALs can be read out by a programmer if the security bit isn't set. Otherwise all fields in the jed file except for the signature will be read as unprogrammed. Just try.

A jed file has a fairly understandable mapping to product term and configuration bits.

 

[Revanth Machineni]

PALs can be read out by a programmer if the security bit isn't set. Otherwise all fields in the jed file except for the signature will be read as unprogrammed. Just try.

A jed file has a fairly understandable mapping to product term and configuration bits.

yeh i understood but in programmer we will get only binary digits na, how can we get equations or logic of code from the programmmer

 

[FvM]

The bitposition of each configuration bit is shown in many PAL and GAL datasheets. I presume you understand how logic is implemented by enabling product term bits.

 

[K-J]

yeh i understood but in programmer we will get only binary digits na, how can we get equations or logic of code from the programmmer

If you happen to be working with an Altera part, the following software might help...but it is from 1994 and talks about DOS and extended memory, things I've long since cared about so the software (if you can find it), might not even work on today's computers.
**broken link removed**

More Googling seems to show of a program called 'JED2EQN' that looks like it claims to do what you want. Looks like it can be downloaded from here.
https://docs.google.com/viewer?a=v&...vbWFpbnxlZW1ldHJpY3xneDo0ZmQ4YTE4NGZiMWU1ZjFh

Not matter what, you should expect to find very old software...but hopefully it will still run for you.

Kevin Jennings