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I am trying to run a design with 2 stacked Terasic DE3 boards. One of the designs works when they are not stacked but NIOS hangs with some memory verify errors when they are stacked together. Does anyone know if I have unused pins on both the top and bottom of the same corresponding connectors (HSTC-A), for signals that I am not using, may I just delete them from the assignment and top level files and only use those I am using on both boards or should I still keep the assignments?
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You are the only one who knows if there's any unused pins or not :)
If I were you, I'd still keep the same pin assignment generated by the DE3 System Builder because it shouldn't be the root cause of your problem, unless there's something wrong with it. Speak of which, if the pin assignment of your design is not generated by the DE3 System Builder, you might want to do so by following Chapter 4.6 of DE3 user manual when connecting multiple DE3 boards.
Hope it helps,
David from Terasic
