Can Altera FPGA support DDR2 or DDR3 interchangable memory of PC?

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Ok, that is clearer.

The DDR2 and DDR3 controllers have timing parameters that can be configured. The main task for you as the designer is to perform a timing analysis to confirm that the timing requirements can be met.

If you look at the DDR speeds on Altera's web site

http://www.altera.com/technology/memory/mem-index.jsp

and then compare the bus speeds to those on the DDR2/DDR3 data sheets, you will find that the controllers are quite slow, i.e., its not too hard to meet timing.

Cheers,

Dave

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I am a newbie in ddr world. In my opinion, if i specified a controller with one timing parameter set, such as DDR2-800MHz.

Should it support DDR2-667MHz at the same time?

Would it support samsung's and kingston's memory plugged through the same slot.