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.u_iob_dq/dummy_carry4_co_a has no load. PAR will not attempt to route this signal."
Can these warnings be ignored?
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: