Forum Discussion
New ContributorFitter Pin Placement Constraint
Thank you !
Your work-around solution worked !!!!
All of the FPGA pins are assigned for the development board that we use in-house.
We use a .tcl script for the students to run before they begin their FPGA designs. The .tcl script has all pin assignment made.
When doing a Full Compile (v18.1 LITE) with the assignments the compile fails because of the earlier mentioned Fitter analysis.
If I then, comment out the pin assignment (see for leds[1] below) and save and run the .tcl file, the FPGA will now have that output pin unassigned.
Then, like you mentioned, the Fitter will auto-place that output pin to the only available pin left to the FPGA.
BUT this time, the compile will now complete without any error.
Thank you so much.
Charles
Super ContributorOh, maybe you are saying that PIN_28 *is* the only pin available. Now it makes sense. I thought you meant that there was some other pin available that the Fitter was auto-assigning to.
As for your question about reserved pins, yes, that would work as a workaround for this as well (though of course this bug shouldn't be an issue in the first place). The fact that a direct assignment doesn't work and doing what you've done does work is silly.
