How Could I use DDR in CyClone III Starter kit successfully?

I admit, that setup of DDR II pins and required I/O standard is a somewhat complex action. When designing a DDR interface on a new board from the scratch, the Megawizard guides you through an interactive process, where suitable pins are choosen and Tcl files with I/O settings are generated. If you decided to define the DDR mapping without the Megawizard to choose the pins, you should have a good understanding of the DDR pin group requirements.

However, with CIII starter board, the situation is very easy to my opinion, cause a complete DDR II example design including all necessary pin settings already exists. It's in the cycloneiii_3c25_start_niosii_standard folder. The DDR related assignments can be used also for a non NIOS II related design. altmemddr_pin_assignments.tcl together with the pin mapping defined in cycloneiii_3c25_start_niosii_standard.qsf and the Wizard generated HP DDR controller design top altmemddr.v can be starting point for an own DDR II design, that fits the Dev Kit supplied hardware.