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Altera_Forum
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17 years ago

Using SODIMM DDR2 module on Cyclone 3

Hi All, Hope someone can help. I'm just trying to establish the feasibility of using a SODIMM memory DDR2 memory module (e.g Micron MT16HTS25664H) with a Cyclone III FPGA (EP3C40F484C6 o...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

I am also interested in using a 4GB sodimm w/ the CycloneIII except I will be using the largest CycloneIII EP3C120. When trying to add the hpddr2 controller in sopc builder I get the following errors:

Error: cpu_0: Nios II Instruction Master cannot address memories over 2^32

Error: cpu_0: Nios II Data Master cannot address memories over 2^32

Error: cpu_0: Memory map cannot fit within the addressable memory space of the Nios II Data Master which is restricted to 31 address bits

Does this mean that 4GB is not supported? When changing it to a 2GB I part I still get this error:

Error: cpu_0: Memory map cannot fit within the addressable memory space of the Nios II Data Master which is restricted to 31 address bits

Only when I change to a 1GB do the errors go away. I really need to use the 4GB sodimm, is there any way around this problem?

Thank you!

Brianna