--- Quote Start ---
The label on the device package says "EPM570T100C4N". This is equal to the device setting in the corresponding Quartus project.
Well, the datasheet (device handbook) does not contain the pinout, does it? Would you recommend to take the ".pin" file of my Quartus project and to compare it with the PCB schematics?
--- Quote End ---
You can use this file
http://www.altera.com/literature/dp/max2/epm570.pdf and check ALL pins between the pdf and your schematics & layout
also use Quartus -> Assignments -> Pin Planer
and check all entries.
Next step, check your project settings for this device how it should handle unused pins.
If there is no mistake between altera documentation and your design, then check for ESD problems in your enviroment. i remember that we had a chair that was not ESD save and depending on the person some pcb were damaged due to ESD. replacing the chair with one that was ESD safe solved this problem.
Also you power suppply and or your design at all can have problems. voltage over and undershots on input pins, gnd bouncing (probably wont destroy the device)
as your problem happens on more than one pcb then it must be a design weakness, quartus settings or schematics or enviroment.
Honored Contributor
