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AR# 56385

MIG 7 Series DDR3 - timing failures can occur with larger SSI devices

Description

Version Found: v2.0
Version Resolved: See (Xilinx Answer 54025)

Timing failures can be seen when targeting the larger SSI devices (i.e. 2000T) as a result of the XADC being located in a different SLR then the rest of the MIG design.

Solution

This failure has only been seen with multi-controller designs where the XADC is located two or more SLR's away from the SLR region in which the memory interface is located. The multi-cycle constraints need to be updated to accurately reflect the worst case scenario of rstdiv0_sync crossing multiple SLRs to reach the XADC and 1 Buffer. The following constraints need to be replaced in the XDC constraint file if timing failures are seen. 

Replace:
set_multicycle_path -to   [get_cells -hier -filter {NAME =~ *temp_mon_enabled.u_tempmon/xadc_supplied_temperature.rst_r1*}] \
                    -setup 2 -end

set_multicycle_path -to   [get_cells -hier -filter {NAME =~ *temp_mon_enabled.u_tempmon/xadc_supplied_temperature.rst_r1*}] \
                    -hold 1 -end

with:

set_multicycle_path -to   [get_cells -hier -filter {NAME =~ *temp_mon_enabled.u_tempmon/xadc_supplied_temperature.rst_r1*}] \
                    -setup 5 -end
 set_multicycle_path -to   [get_cells -hier -filter {NAME =~ *temp_mon_enabled.u_tempmon/xadc_supplied_temperature.rst_r1*}] \
                    -hold 4 end

Revision History
06/19/2013 - Initial release

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
54025 MIG 7 Series - IP Release Notes and Known Issues for Vivado 2013.1 and newer tool versions N/A N/A
AR# 56385
Date Created 06/13/2013
Last Updated 09/13/2013
Status Active
Type Known Issues
Devices
  • Artix-7
  • Kintex-7
  • Virtex-7
IP
  • MIG 7 Series