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FXion's avatar
FXion
Icon for New Contributor rankNew Contributor
7 years ago

Critical Warning (16248): pin is placed too close with ADC pins.

Device: MAX 10 10M08DAF256C8G Quartus version: 16.0.1 build 218 I kept receiving this critical warning message even I removed lots of redundant pin assignments to keep my design at a minimal level....
bitwise's avatar
bitwise
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

Since you already have the board, you can trick the fitter using the following qsf assignment:

set_instance_assignment -name IO_MAXIMUM_TOGGLE_RATE "0 MHz" -to SystemStop

This tells the fitter that it's a static line which won't introduce transients into your analog signal. If that's not the real case you'll still have the noise issue of course but the fitter will be "happy".