在检查语法时，出现了一个警告，求告诉什么原因？WARNING:Xst:2838 - Path defini
tion '$XILINX/verilog/xst/nt64/unisim_ver' in file D:/Xilinx/14.7/ISE_DS/ISE/vhdl/xst/nt64/hdc.ini is invalid and being ignored. Check the path and ensure that any environment variable specification is legal.
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