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AR# 30050

MIG v2.0 Virtex-5 DDR2 - "WARNING:Par:288" warnings issued on "dummy_carry*" and "dummy_lut*" signals

Description

There are a significant number of warnings in my DDR2 design from MIG 2.0 that are similar to the following:

"WARNING:Par:288 - The signal u_ddr2_top_0/u_mem_if_top_0/u_phy_top_0/u_phy_io_0/gen_dq[62].u_iob_dq/dummy_carry4_co_a[0] has no load. PAR will not attempt to route this signal."

Can these warnings be ignored?

Solution

You can safely ignore these warnings. This logic is necessary to ensure proper placement and, consequently, successful directed routing of a portion of the MIG 2.0 DDR2 design.

If you want to filter these warnings from being displayed or reported, refer to the Project Navigator Help for more information on the ISE Message Filtering capability. Or, you can go to:

http://toolbox.xilinx.com/docsan/xilinx9/help/iseguide/iseguide.htm#html/ise_ds_using_message_filters.htm

AR# 30050
Date Created 01/21/2008
Last Updated 12/15/2012
Status Active
Type General Article