Forum Discussion
Altera_Forum
Honored Contributor
18 years agoAs Frank indicated, setting "Reserve all unused pins" to "As output driving ground" (or to anything else) affects only the I/O pins that do not have a signal in your design--either a source file top-level port or an individual pin reserved with the "Reserve Pin" setting--placed at them. I have never seen the behavior you described. If you haven't yet, check the .pin file or the Fitter compilation report pin tables to confirm that the signals in your source file were actually placed at the pin locations you intended. If the signals were at the correct pin, then I suggest that you file a service request to find out whether you've run into a bug or have something else going on that you haven't uncovered yet.