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why does ddr2 controller have local bus doubled ?

Altera_Forum
Honored Contributor II
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why does the Cyclone II device ddr2 controller have local bus doubled? what is the aim of that? 

thanks.
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Altera_Forum
Honored Contributor II
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My first thought is that it makes it much easier to meet timing on the local side, both in the controller and user's logic.

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Altera_Forum
Honored Contributor II
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so does it have something to do with the resynchronization operation that follows it?

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