Hi, I need to use the usb-uart port of the development kit on the FPGA side of arria 10. When I traced the signals on schematic, I found that J18 and J19 pins are for tx and rx relatively. However, these pins are shared io pins (there is no HPS in my project) and when I tried to loopback from the fpga(I wrote a VHDL code that connects rx to tx directly and made necessary assignments on the pin planner.), I saw that rx pin picks up the coming signals ( I saw it on the signalTap) but there is no return(cant recive the data back ). I searched the user guide and the web and coulndt find anything usefull.
Related VHDL code is basically this:
uart_tx <= uart_rx;
uart_rx is assigned to PIN_J19
uart_tx is assigned to PIN_J18