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Altera_Forum's avatar
Altera_Forum
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18 years ago

DDR/DDR2 HP compiler - multiple devices

Hi, I am trying to drive two DDR devices from one instance. I have made the settings in the wizard, so I am getting two clock pairs, 2 cke's and so on. But the ras/cas/adress signals needs to ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

The DDR core probably maps to IO primitives, which connect directly to their associated IO. So you can't split it and have it drive two. Since you don't actually want two controllers, just a single one that drives a wider bus, you should be able to configure it that way. (Plus, what you're doing would not work from a timing perspective. Having a singel DDR element take the time to drive two pins would throw off the timing quite a bit.)