Warning appeared while inferring SRAM on xilinx Virtex-E by synplify 7.3.1

Dear all,
    While I tried to infer SRAM in synplify7.3. It came out the
following warning. Though I see the log and 7.1 did gen the SRAM by
Block RAM. I wonder if there's any answer or solution to this warning.
Thank you very much!~

@W: Could not implement Block RAM. Is the read address registered using
the same clock as the RAM?