Error: Channel uncertainties must be greater than or equal to 0 - Error: Channel uncertainties must be greater than or equal to 0 Description When you use the DDR3 SDRAM controller with UniPHY and follow the FPGA wiki page (Intel communities) Measuring_Channel_Signal_Integrity to calculate ISI parameters in the Board Settings tab of the DDR3 IP GUI, you may get a negative number. You will get the above error message if the negative number is entered into the GUI. Resolution To avoid the error message, enter zero if you calculate a negative number for ISI parameters. Custom Fields values: ['novalue'] Troubleshooting 1408038219 False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 14.0 ['Arria® V GT FPGA', 'Arria® V GX FPGA', 'Arria® V GZ FPGA', 'Arria® V ST FPGA', 'Arria® V SX FPGA', 'Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA', 'Stratix® V E FPGA', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']