The 13.1 Quartus II software release generates the error "Unresolved defparam reference to "lcell_inst" in lcell_inst.lut_mask" - The 13.1 Quartus II software release generates the error "Unresolved defparam reference to "lcell_inst" in lcell_inst.lut_mask" Description VHDL simulation of the ALTERA_PLL and ALTERA_PLL_RECONFIG IP cores generates the following error message: # ** Error: (vsim-10000) D:/build/13.1/58_acdsTO/acds/quartus/eda/sim_lib/altera_lnsim.sv(3978): Unresolved defparam reference to 'lcell_inst' in lcell_inst.lut_mask. # # Region: /top_tb/upstreampll/pll_c_delaycalc_40_altera_pll_altera_pll_i_272/genblk2/genblk1/lcell_cntsel_int_4/genblk1 # ** Error: (vsim-10000) D:/build/13.1/58_acdsTO/acds/quartus/eda/sim_lib/altera_lnsim.sv(3979): Unresolved defparam reference to 'lcell_inst' in lcell_inst.dont_touch. Resolution In your simulation tool, ensure < family > _atoms.v is in use, not < family > _atoms.vhd .For example, in ModelSim, use the following: vlib verilog_libs/stratixv_ver vmap stratixv_ver ./verilog_libs/stratixv_ver vlog -vlog01compat -work stratixv_ver {/tools/quartuskit/13.1/124/linux64/eda/sim_lib/mentor/stratixv_atoms_ncrypt.v} vlog -vlog01compat -work stratixv_ver {/tools/quartuskit/13.1/124/linux64/eda/sim_lib/stratixv_atoms.v} vlib vhdl_libs/stratixv vmap stratixv ./vhdl_libs/stratixv #vlog -vlog01compat -work stratixv /tools/quartuskit/13.1/138/linux64/eda/sim_lib/mentor/stratixv_atoms_ncrypt.v #vlog -sv -vlog01compat -work stratixv /tools/quartuskit/13.1/138/linux64/eda/sim_lib/stratixv_atoms.v Custom Fields values: ['novalue'] Troubleshooting novalue True ['Simulation'] ['FPGA Dev Tools Quartus II Software'] 13.1.3 13.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']