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AWrithingMassOfFlesh's avatar
AWrithingMassOfFlesh
Icon for Occasional Contributor rankOccasional Contributor
4 years ago
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Cyclone IV E: EP4CE22F17C8 I/O pins misbehaving

Hi All, I am developing with the Cyclone IV E: EP4CE22F17C8. I am observing anomalous behavior from two of the I/O pins on the chip. I have pin A11 configured as a general purpose output, howe...
  • AWrithingMassOfFlesh's avatar
    AWrithingMassOfFlesh
    4 years ago

    I found the issue. I was assigning the wrong pins. I was supposed to be driving A12 instead of A11 and L13 instead of L14.

AWrithingMassOfFlesh's avatar
AWrithingMassOfFlesh
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

These are the pin assignments below. I circled the problematic pins, and also show the pins that are working correctly with the same configurations. The fact that I am applying the same assignments to these pins and getting different behavior it what I don't understand. I also use the same logic and assignments in a separate project for a different Cyclone IV device where it works as expected.