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AR# 57142

Vivado 2013.2 - Getting Shape Builder 18-119 Critical warnings even with no user constraints being dropped

Description

After I insert an ILA 2.0 core in my design, I receive critical warnings [Shape Builder 18-119] similar to the following:
 

[Shape Builder 18-119] Failed to create CARRY shape for instance XX_CARRY4. Instance XX/S1 cannot be placed in ...

[Shape Builder 18-119] Failed to create SRL shape for instance XX/S1.

I have not added any bel loc constraints in my XDC.

Why am I receiving this warning and can it be ignored?

Solution

In the inserted ILA netlist, the SOFT_HLUTNM property has been set for the SRL16 and  LUTRAM.

The 
SOFT_HLUTNM property instructs the tool to place two LUT5, SRL16, or LUTRAM components with compatible inputs into the same LUT6 site.

If the SOFT_HLUTNM fails then the critical warning will be issued.
 
The critical warning can be ignored safely and in the 2013.4 release the critical warning is downgraded to a warning. 
AR# 57142
Date Created 08/16/2013
Last Updated 10/06/2014
Status Active
Type General Article
Devices
  • Artix-7
  • Kintex-7
  • Virtex-7
Tools
  • Vivado Design Suite - 2013.2