Quartus Prime Pro Edition software erroneously applies location assignments and constraints to I/O pads instead of logical pin names - Quartus Prime Pro Edition software erroneously applies location assignments and constraints to I/O pads instead of logical pin names Description In the Quartus ® Prime Pro Edition software, the I/O pad atom does not replace the logical pin name. Instead, the I/O pad atom is inserted in between the logical pin name and the rest of the logic, and it has the suffix ~pad . All assignments made to the logical pin name, including location constraints, are automatically applied to the pad. For example, the logical pin named clk has a corresponding pad called clk~pad . If you have a location assignment to clk , the assignment is applied to clk~pad instead of clk . Resolution There is no workaround. This issue will be fixed in a future release of the Quartus Prime Pro Edition software. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 15.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']