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A serial interface is a simple way to connect an FPGA to a PC.
This project shows how to create an asynchronous serial link like RS-232 in an FPGA.
It creates a signal "TxD" by serializing the data to transmit.

It takes a signal "RxD" from outside the FPGA and "de-serializes" it for easy use inside the FPGA.

The project's code can be found here.