I'm Adzim. Thanks for using Intel Community.
For the Cyclone IV device specification, you can visit the page in the link below:
From there you can see that the Cyclone IV device can support the SDR, DDR and DDR2 memory interface.
For the pin location, you can use the F256/U256/M256 as highlighted in the pinout file.
I think you can refer to that packages as they might have the same DQS pins as well.