Forum Discussion
Occasional ContributorQuartus assigns Pins labeled Input and Output as Bidir
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.
Super ContributorCan you show more of the design? Something is obviously conflicting making the tool think you have both inputs and outputs assigned to the same pins.
Occasional ContributorHi Sstrell,
Thanks as always for the help.
I had the same thought about a conflict but have been over and over the design and can’t see a problem. I wonder if there’s a file assignment by System Builder that’s causing the problem, but I can’t find that either. Also, I did the 2-bit test described previously also using System Builder, and no problem with it.
In my original posting, I neglected to include what’s possibly the most interesting evidence. GPIO[15] is a non-bus, single-pin input, and it, like the buses, is assigned Bidir by Quartus. See my 03 attachment.
I broke the full design into 3 clips of 5-bits each, so the resolution should be adequate.
My best,
Bill
