Cyclone® III automotive grade devices are not fully supported in the Quartus® II software version 9.1 SP2 and later. Altera recommends you use Cyclone IV E automotive grade devices for new designs. Cyclone IV E automotive grade devices have a longer lifecycle to provide better support for automotive OEM manufacturing requirements and have lower pricing than existing Cyclone III automotive grade devices.
Although creating new designs targeting Cyclone III automotive grade devices is not supported, you can still compile your existing Cyclone III automotive grade design with the Quartus II software version 9.1 SP2 and later.