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tCCD (including tCCD_L and tCCD_S) and tRTW violations can occur as a result of a known issue with the MIG UltraScale DDR3/DDR4 controller for DDR4 x16 and DDR3/DDR4 multi-rank configurations only.
All other single rank or DDR4 x4 and x8 configurations or x16 interfaces running <1333Mbps are not affected.
These violations can be seen in behavioral simulations and can result in data errors in hardware and should not be ignored.
In order to resolve this issue installing the attached tactical IP patch is required.
To install the patch, extract the contents of "AR62930_MIG_UltraScale_v6_1_preliminary_rev1.zip" to the 2014.4 install directory (for example, C:\Xilinx\Vivado\2014.4\), then open Vivado 2014.4 and regenerate all of your MIG UltraScale IP.
Note: This tactical patch is only compatible with the Vivado 2014.4 and MIG UltraScale v6.1 IP.