General Description: If a black box in my design contains only outputs (Xilinx sells the ILA Controller, which fits this description), FPGA Express removes the component and reports the following warning:
"Warning: The pin '<pin_name>' is not connected to any net. (FPGA-CHECK-1)"
解决方案
Declare the output ports as INOUTs, and declare any ports connecting to the output ports as INOUTs.