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Registered: ‎04-13-2017

Bank Sharing Among two MIG Controllers

Hi,

 

I am trying to connect two DDR3s to a Kintex-7. I would like to connect each DDR3 using two MIG. Basically, I know that it is not possible to share a bank when using two MIG. However, I have seen the following on UG586 (page 194).

 

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Bank Sharing Among Controllers

No unused part of a bank used in a memory interface is permitted to be shared with another memory interface. The dedicated logic that controls all the FIFOs and phasers in a bank is designed to only operate with a single memory interface and cannot be shared with other memory interfaces. With the exception of the shared address and control in the dual controller supported in the MIG core.

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Could you tell me what the red comment above mean?

If setting MIG as below, does it mean that address and control can be shared on a bank?

 

1.png

 

Thanks

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Registered: ‎11-28-2016

Re: Bank Sharing Among two MIG Controllers

Hello @blingbling-eyes,

 

Looking back at earlier versions of UG586 this seems to be an artifact from a brief period of time when the concept of bank sharing among controllers was in the plans to be a supported feature but was quickly dropped due to the design complexities to allow for such a limited use case.  You can check out Chapter 5 in UG586 and see that one on the high level bullets in the Multicontroller Design section says that bank sharing between controllers is not allowed. 

 

I filed a documentation change request to get these instances removed from the various chapters throughout UG586.

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