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AR# 63789

MIG UltraScale DDR3/DDR3L (HR banks only) - When targeting the top data rates supported for -2/-3 speed grades, it is required to target a memory device one speed grade faster than the target datarate


Version Found: MIG UltraScale v7.0
Version Resolved: See (Xilinx Answer 58435)

When targeting a DDR3/DDR3L memory in HR banks for -2/-3 UltraScale speed grades, it is required for the memory devices selected to be one speed grade higher than the target memory datarate.  

This is only required when targeting the top supported data rates. 

For example, a target datarate of 1066Mbps requires a 1333Mbps memory part.

The UltraScale memory interface tool does not currently enforce this frequency requirement.


Please ensure when targeting DDR3/DDR3L within a -2/-3 HR bank, that the memory part selected is one speed grade faster than the memory datarate.

AR# 63789
Date Created 03/04/2015
Last Updated 04/30/2015
Status Active
Type Known Issues
  • Kintex UltraScale
  • Virtex UltraScale
  • MIG UltraScale