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AR# 63238

MIG UltraScale RLDRAM3 - timing failures in mmcm_clkout0 domain


Version Found: MIG UltraScale v6.1
Version Resolved: See (Xilinx Answer 58435)

The following path (or similar paths) may fail timing for MIG UltraScale RLDRAM3 designs as a result of a long route delays or as a result of incorrect speed files used for -1 and -1L devices:

Slack (VIOLATED) :        -0.202ns  (required time - arrival time)
  Source:                 rldram3_example_top_ab/u_rldram3_ctrl_AB/inst/u_rld3_mem_intfc/u_rld_ui/usr_addr_fifo/u_af/RDCLK
                            (rising edge-triggered cell FIFO36E2 clocked by mmcm_clkout0_1  {rise@0.000ns fall@1.876ns period=3.752ns})
  Destination:            rldram3_example_top_ab/u_rldram3_ctrl_AB/inst/u_rld3_mem_intfc/u_rld_ui/usr_wr_fifo/gen_wdf0[1].u_wdf_data1/RDEN
                            (rising edge-triggered cell FIFO36E2 clocked by mmcm_clkout0_1  {rise@0.000ns fall@1.876ns period=3.752ns})
  Path Group:             mmcm_clkout0_1
  Path Type:              Setup (Max at Slow Process Corner)


Careful floorplanning can be used to resolve these timing failures.

However, in some cases floorplanning might not resolve the issue in which case installing the attached tactical IP patch is required.

If you are still unable to resolve the timing failures please open a webcase with Xilinx Technical Support.

To install the patch, extract the contents of "AR63238_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.
Note1: This tactical patch is only compatible with the Vivado 2014.4 and MIG UltraScale v6.1 IP.
Note2: Performance_NetDelay_high or Congestion_SpreadLogic_high implementation strategies may need to be applied to close timing with the provided patch.

Revision History:
01/16/2015 - Initial Release


Associated Attachments

Name File Size File Type
AR63238_Vivado_2014_4_preliminary_rev1.zip 1 MB ZIP

Linked Answer Records

Master Answer Records

AR# 63238
Date 02/19/2015
Status Active
Type Known Issues
  • Kintex UltraScale
  • Virtex UltraScale
  • MIG UltraScale