Why is the "Enable input tri-state on active configuration pins in user mode" option disabled in the Quartus® II software version 10.0? - Why is the "Enable input tri-state on active configuration pins in user mode" option disabled in the Quartus® II software version 10.0? Description Due to a problem in the Quartus® II software version 10.0, the Enable input tri-state on active configuration pins in user mode option on the Configuration panel of the Device and Pin Options dialog box is disabled for Cyclone® III, Cyclone® III LS, Cyclone® IV E, Stratix® III, and Stratix® IV devices. Resolution To work around this problem, you can enable this option by adding the following assignment to your Quartus II Settings File (.qsf): set_global_assignment -name TRI_STATE_SPI_PINS ON This problem is scheduled to be fixed in a future release of the Quartus II software. Related Articles How do I assign dual-purpose pins to be a user I/O after configuration in Quartus II software version 10.0? Custom Fields values: ['novalue'] Troubleshooting - False ['novalue'] ['novalue'] novalue novalue ['Cyclone® III FPGAs', 'Cyclone® III LS FPGA', 'Cyclone® IV E FPGA', 'Stratix® III FPGAs', 'Stratix® IV E FPGA', 'Stratix® IV GT FPGA', 'Stratix® IV GX FPGA'] ['novalue'] ['novalue'] ['novalue']