What is the max ddr2 clock frequency support by cycloneiv?

[Altera_Forum]

For EP4CE30F23C6N device, what is its max clock to drive external ddr2? I just find one statement on handbook "support to DDR2 SDRAM interface up to 200Mhz" 

 Where I can find the detail specification about my concerns?  I need to have this clock value to estimate the data buffer bandwidth.  Thanks a lot.

[Altera_Forum]

Altera's DDR2 SDRAM interface IP doesn't support operation above 200MHz in -6 speed grade (fastest) Cyclone IV parts. This will be the limit if you wish to use Altera's IP. 

 Cheers, Alex

[Altera_Forum]

Thanks for your reply. Does this mean the best case the cyclone iv device with -6 speed grade is able to run under 200Mhz DDR2 clock?

[Altera_Forum]

The practical answer - yes. If you wish to use Altera's DDR2 IP. 

 Cyclone IV will support much higher external clock output frequencies. Refer to the PLL Specifications in the cyclone iv device datasheet (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/cyclone-iv/cyiv-53001.pdf), and table 1-25. A -6 part will support up to 472.5MHz, depending on I/O standard. However, putting that to use as part of a DDR2 interface is another matter and not something to be undertaken lightly.  Cheers, Alex

[Altera_Forum]

tks a lot!!!!!!!