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195 Views
Registered: ‎10-25-2017

DDR3 System Clock Selection

We have a custom design with Artix-7, XC7A200T and DDR3 and using Vivado 2015.2.

In this design we are operating DDR3 via MIG at a rate of 400MHz. Thus we chose the system clock in MIG tool like 2500ps(which is default and highest frequency).

Now when we migrated to Vivado 2018.2. In MIG tool if we select the system clock as 2500ps(instead of default 3000ps) tool is giving a warning that "for optimal resource utilization use default clock period or more that default" What exactly is this warning? If we ignore the warning and choose 2500ps , will it affect only resource utilization or will it also affect performance?

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3 Replies
Moderator
Moderator
124 Views
Registered: ‎03-16-2017

Re: DDR3 System Clock Selection

Hi @udaykumarurimi ,

Moving this post to proper board for this query. 

Simultaneously , have a look into this thread. It looks similar. https://forums.xilinx.com/t5/Memory-Interfaces/MIG-warning-at-maximum-frequency/td-p/778422

 

 

Regards,
hemangd

Don't forget to give kudos and mark it as accepted solution if your issue gets resolved.
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115 Views
Registered: ‎10-25-2017

Re: DDR3 System Clock Selection

Hello @hemangd ,

Thanks for the link.

Uday

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Xilinx Employee
Xilinx Employee
107 Views
Registered: ‎08-21-2007

回复: DDR3 System Clock Selection

If the memory controller is running at the highest frequency, please ensure the hardwrad simulatin is completed for signal integrity.

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