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You just need to add a UART (a Universal Asynchronous Receiver/Transmitter) to your FPGA design. Connect the TX and RX signals from the UART to the MAX232, convert them to RS-232 voltage levels, and then connect to the PC. You should be able to find sample code on your own, now that you know what to search for.
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solved how to take /use serial input in verilog?