ignoring SPO output on dual port ram

Hi, I want to get rid of the warnings when not using the SPO port on a dual port ram(DPR). Using RAM16X1D's to build a DPR within a Spartan2 using ISE. When writing to the DPR on the synchronous port I never want to get the data out of SPO. Is there a way I can remove the warnings "SPO has no load" by connecting some sort of 'sink' to this port. I have tried pulldowns but still "no load". I use the asynchronous port (DPRA and DPO) to read the data out. Thanks,Ben.