Values of rx_signaldetect are always high in post-fit simulation models that target Arria V devices with custom PHY IP cores - Values of rx_signaldetect are always high in post-fit simulation models that target Arria V devices with custom PHY IP cores Description If you use Mentor Graphics ® ModelSim-Altera® to perform a post-fit simulation for a custom PHY IP core that targets an Arria V device and the sd_on value in the av_xcvr_native.sv file is set to a value of 16 (the default value is 16), the rx_signaldetect value is always high regardless of whether the rx_serial_data signal is 0, 1, x or z. Resolution Update your Quartus II Settings File ( .qsf ) with the following settings: Set the pdb_sd parameter to false . Add the QSF assignment set_instance_assignment -name XCVR_RX_SD_ENABLE ON -to * to turn on the Secure Digital (SD) unit. To set the sd_on value to 1 , add the QSF assignment set_instance_assignment -name XCVR_RX_SD_ON 1 -to * . Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.1 ['Arria® V FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']