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Altera_Forum's avatar
Altera_Forum
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14 years ago

DDR3 instantiation, NIOS, Avalon, Qsys

Goal: try to instantiate DDR3 with the DIMM in the Stratix IV E kit (DDR3 with NIOS using Avalon-MM). Goal: try to harness already existing DDR3 Stratix IV E kit work for a new project. The ki...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

I'm not sure what could be happening to cause the ECC bits to not calibration since I have not used ECC before. One thing to check is whether the memory DIMM even has a 72-bit data bus. I could see memory module manufactures leaving the extra 8-bits out to save money in the DIMMs for PCs (i.e. not servers) since typically only server grade processors implement ECC. So calibration could be failing due to a lack of there being ECC memory present.

The easiest way to check this is count the number of SDRAM ICs on the module, if it has 8 or 16 then you only have a 64-bit data bus.