Error ID 15629: Atom "lcell_inst" is dependent on unconnected input ports - Error ID 15629: Atom "lcell_inst" is dependent on unconnected input ports Description You might see this error when instantiating a PLL_RECONFIG Intel® FPGA IP in the Quartus® II software versions 13.0 SP1 and earlier. Resolution Add the following parameter in the Quartus II Settings File (.qsf) for your project: set_instance_assignment -name adv_netlist_opt_allowed "never allow" -to <name> Here is an example: set_instance_assignment -name ADV_NETLIST_OPT_ALLOWED "NEVER ALLOW" -to "qsys_pcie:u0|altera_pll_reconfig_top:pll_reconfig_0" Additional Information This problem is fixed in the Quartus II software v19.1. Related Articles Error (15629): Atom comb~6 is dependent on unconnected input ports Error (15629): Atom comb~0 is dependent on unconnected input ports Custom Fields values: ['novalue'] Troubleshooting 2205686543 False ['PLL Reconfig IP'] ['FPGA Dev Tools Quartus® Prime Software'] 19.1 13.0 ['Arria® 10 Bare Die', 'Cyclone® Bare Die', 'Stratix® FPGAs'] ['novalue'] ['novalue'] ['novalue']