警告求助。。。。 example, black, without

WARNING:Xst:2211 - "D:/example/scan/dds.vhd" line 58: Instantiating black box module <sin>.
WARNING:Xst:2734 - Property "use_dsp48" is not applicable for this technology.
WARNING:Xst:2404 -  FFs/Latches <ad_jun<29:12>> (without init value) have a constant value of 0 in block <V_measure>.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch  <ad_youxiao_10> (without init value) has a constant value of 0 in block <V_measure>.
WARNING:Xst:2677 - Node <ad_d_4> of sequential type is unconnected in block <DDS>.