Error: (vsim-3033) Why do I get the following error when simulating DDR, DDR2 or DDR3 High Performance (HP) Controller in a Stratix IV device? - Error: (vsim-3033) Why do I get the following error when simulating DDR, DDR2 or DDR3 High Performance (HP) Controller in a Stratix IV device? Description Why do I get the following error when simulating DDR, DDR2 or DDR3 High Performance (HP) Controller in a Stratix IV device? Error: (vsim-3033) ../../../../<design_path>/<instance_name>_phy_alt_mem_phy.v(4988): Instatiation of stratixiii_ddio_in failed. The design unit was not found DDR, DDR2 and DDR3 SDRAM High Performance (HP) Controller simulation uses stratixiii_ddio_in when simulating the controller for Stratix® IV device because the architecture for Stratix III and Stratix IV is the same. When simulating the design for Stratix IV, include following libraries in your simulation: For VHDL: 1. <Quartus Installation path>/eda/sim_lib/stratixiii_atoms.vhd 2. <Quartus Installation path>/eda/sim_lib/stratixiii_ components.vhd For Verilog: 1. <Quartus Installation path>/eda/sim_lib/stratixiii_atoms.v Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Stratix® IV E FPGA', 'Stratix® IV GT FPGA', 'Stratix® IV GX FPGA'] ['novalue'] ['novalue'] ['novalue']