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.

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