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Altera_Forum's avatar
Altera_Forum
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11 years ago

Reverse Engineering a classic CPLD

I have been tasked with reverse engineering an ancient PCB that has a EP610 and EP220 on board. I have the .jed files which verify with the devices. My question is, does anyone know how the .jed file refers to the "fuse" matrix within the CPLDs so that I can figure out what the logic is actually doing rather than what I think it is doing and so put it in an available device?

Many thanks

Neil

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    11 years ago

    Hi There!

    I have no idea but it's an interesting question :-) Rather than trying to reverse engineer the fuse pattern, wouldn't it be easier to just emulate the behavior? That is, if the device still works. Depending on the complexity, you should be able to observer its behavior on a logic analyzer, no?

    -Mux