Re:I decided to build a nine-bit computer
by tyingq on Wednesday February 09, 2022 @09:16AM
(#30272845)
>I’m not sure that FPGA can handle more than two voltage levels
There is a high-Z (high impedance) state you can set I/O pins to for a third state, but no way to detect that high impedance state from the FPGA. It's just used to share an output line with more than one pin. You could make a peripheral that could detect the three states though, with a voltage divider and an analog input.
There is a high-Z (high impedance) state you can set I/O pins to for a third state, but no way to detect that high impedance state from the FPGA. It's just used to share an output line with more than one pin. You could make a peripheral that could detect the three states though, with a voltage divider and an analog input.