DDR data retention

Question

Looking into getting data retention working for my design and I came across below requirement in the documentation.  
  
"The AFI must use all four DDR controllers. (All of DDR_A_PRESENT, DDR_B_PRESENT, DDR_D_PRESENT must be set. DDRC is part of the shell and is always present.)"  
  
My design only uses DDRC so I only care about DDRC data retention. Can I get away with not instantiating the other three DDR controllers or they're necessary for some reason?

Answer

Thanks. This isn't that big of a deal for me, just a nice to have. Tradeoff for my design is I'd rather use logic for more modules than otherwise unused memory controllers.

Answer

Hello,  
  
With the current implementation, all four DDR controllers are required for DDR Data retention to work. Your AFI creation (if DDR Retention is enabled) will fail if we do not detect all four DDR controllers.   
  
We will also take this as a feature request to see if/how we can enable your use case.  
  
-Deep

DDR data retention

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