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Altera_Forum
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19 years ago

Multiple Memory Controllers

I am using the Stratix II and want to have two Altera DDR2 controllers on the same side of the device. I'm not sure how to go about doing this. Has anyone tried this before?
Altera_Forum's avatar
Altera_Forum
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18 years ago

Hi htian,

Sorry, I don't understand your two statements:

1) If each bus width is larger than 64, then the 2 controllers on the same side is not much easy. Pin assignment to meet the requirement is the first one to deal with. The IP is not flexbile with 2 ddr controller. You may need to manually add the constraints in the Quartus.

>> What? Do you mean if the total DQ width of your two controllers is greater than the number of available DQ pins?

2) And It looks like the device cannot support 2 controllers use dedicated DQS circuit. So the frequency of ddr2 core cannot higher than 166 M(or 200M?)

>> Again, sorry I don't see your point, I have personally designed StratixII FPGAs with 6 controllers all running at 266MHz, and more recently two controllers at 300MHz on the same side of a single device.

Please clarify your points.