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Read the data sheets for both memory types. You will find that they use different voltages and different terminations.
Although an FPGA can support both styles of memory, and hence the controller allows you to select either memory type, when it comes to designing a board, you have to select one type.
Cheers,
Dave
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Perhaps there are misunderstanding between us.
I want to implement a DDR2 controller to support DDR2 memory produced by different manufacturer or in different model.
The other case is that DDR3 controller should be implemented on other board to support all kinds of model in stock.
It can be said that on the DDR2 board the controller only support DDR2. DDR3 board support DDR3 only too.
So I think DDR2 memory should have the same voltage and termination specifications, it can be implemented as north bridge chip does.
The most difficult thing is about the static timing parameter.
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