Configuration of pins is not enabled properly for Cyclone and Stratix Devices - Configuration of pins is not enabled properly for Cyclone and Stratix Devices Description On the Configuration page of the Device and Pin Options dialog box, the Enable input tri-state on active configuration pins in user mode option is not enabled properly. This applies to Cyclone IV GX, Cyclone III, and Cyclone III LS. Resolution To enable input tri-state on active configuration pins, use the following assignment in the Quartus Settings File ( .qsf ): set_global_assignment -name TRI_STATE_SPI_PINS ON . Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 10.0 ['Cyclone® III FPGAs', 'Cyclone® IV FPGAs', 'Stratix® III FPGAs', 'Stratix® IV FPGAs'] ['novalue'] ['novalue'] ['novalue']