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AR# 62863

FIFO Generator v12.0 - New warning occurs in Vivado 2014.3 : [Constraints 18-1079] Register Fifo/U0/inst_fifo_gen/gconvfifo.rf/grf.rf/rstblk/ngwrdrst.grst.g7serrst.rd_rst_asreg_reg and Fifo/U0/inst_fifo_gen/gconvfifo.rf/grf.rf/rstblk/ngwrdrst.grst

Description

I have upgraded the FIFO Generator to Vivado 2014.3, however I now receive the following warnings during implementation:

[Constraints 18-1079] Register Fifo/U0/inst_fifo_gen/gconvfifo.rf/grf.rf/rstblk/ngwrdrst.grst.g7serrst.rd_rst_asreg_reg and Fifo/U0/inst_fifo_gen/gconvfifo.rf/grf.rf/rstblk/ngwrdrst.grst.g7serrst.rd_rst_asreg_d1_reg are from the same synchronizer and have the ASYNC_REG property set, but could not be placed into the same slice due to constraints or mismatched control signals on the registers.


How can I resolve this?

Solution

This is a known issue in the FIFO Generator core for Vivado 2014.3/2014.4.

This warning can be safely ignored. 

This issue is fixed in the Vivado 2015.1 release.

 

AR# 62863
Date Created 11/18/2014
Last Updated 05/20/2015
Status Active
Type General Article
Tools
  • Vivado Design Suite - 2014.3
  • Vivado Design Suite - 2014.4
IP
  • FIFO Generator