Why do I get a Fitter error when compiling LPDDR2 soft memory controller? - Why do I get a Fitter error when compiling LPDDR2 soft memory controller? Description You may see the following fitter error when compiling the LPDDR2 soft memory controller in the Quartus® II software version 12.0SP2: "Error (175020): Illegal constraint of pin to the region (3, 115) to (112, 115): no valid locations in region" This is due to a problem with a pre-fitter enhancement that has been fixed in the Quartus II software version 12.1. Resolution Compile your design with the Quartus II software version 12.1. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.1 12.0.2 ['Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA'] ['novalue'] ['novalue'] ['novalue']