Forum Discussion

BillM256's avatar
BillM256
Icon for Occasional Contributor rankOccasional Contributor
4 years ago
Solved

Quartus assigns Pins labeled Input and Output as Bidir

Hello, I’m stumped. Context: DE10-Nano. Project setup with Terasic System Builder. GPIO_1 defined by System Builder, GPIO_0 undefined. See attachment 00. Goal: A simple test register of D F/Fs ...
  • sstrell's avatar
    sstrell
    4 years ago

    I know nothing about this System Builder tool you mention, but check the Assignment Editor and/or the .qsf file for strange assignments. Something is going on.

sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
4 years ago

This is a very strange use of DFFs, but anyway, why do you have the bus stubs (with the X's) at the top and bottom between the input and output sides? I doubt you've named them so perhaps the "GPIO" name is getting carried between the inputs and outputs. Try removing those extra bus stubs.