[Oberon] Serial UART question

Skulski, Wojciech skulski at pas.rochester.edu
Sun May 17 06:34:34 CEST 2020


  looking at your schematics, I can see that you routed RD, WR, RxE, TxE from the FT2232 to the FPGA. Are you actually using them all in the firmware? Are the same as Rx, Tx, RTS, CTS? I have seen serial cables with just the Tx and Rx and no RTS or CTS. I have also used the cables where RTS was looped back to CTS on board and not even connected to the CPU, which did not even provided such pins.

Looking at the NW RISC5top.v and his original UCF I can only see TxD and RxD, but not RTS or CTS.

I wonder if these RTS and CTS are not superfluous. Why are they needed, if needed at all?

Thank you,

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