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Altera_Forum
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14 years ago

Can't get DDR2 ALTMEMPHY to work on Cyclone IV E

Greetings. I am having some difficulty getting the Altera DDR2 ALTMEMPHY SDRAM controller to work on my Cyclone4E EP4CE30F23. I have configured the DDR2 controller to run in half-rate mod...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

It looks like the problem was related to the fact that I was using two x16 memory parts in parallel (effectively creating a 32-bit external memory interface).

When I reconfigured my DDR2 ALTMEMPHY controller to only use one of my two memory chips, it works.

I guess the question is now 'How do I properly tell the DDR2 wizard to use two x16 memory chips'? The only change in the wizard configuration that I did to make it work was to change the 'Total Memory Interface DQ Width' from 32 to 16.

Thanks

Scott