Quartus will not allow a non-differential signals within I believe 4 pins of a differential signal. The solution is to move the single-ended signal away from the differential pair. The reason for this has to do with maintaining the integrity of the differential signal. A single ended signal running next to either the positive or negative end of a diff pair could induce single ended noise; and diff signals are only good at rejecting common-mode noise.
Something else to beware of, depending on the device and whether the differential signals are inputs or outputs, is that the bank voltage where the differential signals reside may have to be powered by 2.5V. This may negatively impact your single ended signal causing it not to meet the VINhi levels of the device it is tied to.
"Górski Adam" wrote in message news:fc3jmt$4s8$ snipped-for-privacy@atlantis.news.tpi.pl...
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