AR# 64615


UltraScale DDR4/DDR3 - AXI Interface efficiency improvements for 2015.2


Version Found: DDR4 v7.1, DDR3 v7.1

Version Resolved: See (Xilinx Answer 69035) for DDR4, See (Xilinx Answer 69036) for DDR3

The product guide recommends ROW_COLUMN_BANK for the ordering of the memory controller.

Due to changes in the MIG controller for UltraScale, this will cause low performance for AXI interfaces.


To improve the efficiency of the AXI interface, the parameter AUTO_AP_COL_A3 should be set to "ON" in the RTL located in the files below.

You will need to update the file which matches the memory type you have selected:

  • DDR3-
  • DDR4 -

Revision History:

06/25/2015 - Initial Release

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
69036 UltraScale/UltraScale+ DDR3 - Release Notes and Known Issues N/A N/A
69035 UltraScale/UltraScale+ DDR4 - Release Notes and Known Issues N/A N/A
AR# 64615
Date 01/02/2018
Status Active
Type Known Issues
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