Sides for DDR2 DQ and DQS

[Altera_Forum]

Hi, All 

 Our design is going to use 2 Sides of EP3C40, Because there are not enough DQ pins in 1 Side. For better performance, which two should chose?  TOP and Bottom or Bottom and Right, or Others, and Why?   Thanks

[Altera_Forum]

top bottom are typacally used for memomry applications, left right for serdes applications.

[Altera_Forum]

Forgot the why: io's and pll's have more dedicated hardware for ddr on top and bottom

[Altera_Forum]

sorry i was too quick... i was talking about stratix3 not cyclone...

[Altera_Forum]

--- Quote Start ---  sorry i was too quick... i was talking about stratix3 not cyclone...  --- Quote End ---       Is it the same in Cyclone III, I am not fimilar with stratix3   And I choosed TOP and Bottom, Will these two sides too far away, which will cause bad STA result?

[Altera_Forum]

Can anyone help me, I still waiting a better answer