I'd like to add weak pull-down resistors for used input I/O pins on cyclone V. However, I can only find an optional programmable pull-up resistor for each I/O pin in handbook. Is there any way to add a weak pull-down resistor for used input I/O pins?
Also, there is an optional bus-hold feature.
- Can I define an inout port and have an initial output value, then change to input mode to let the input hold the value of the initial output?
- In this case, how high a voltage from the pin can stop holding the value?
Thanks and regards,
Thank you for your information.
Actually, I'm using an existing board that has a cyclone V device on it. I'd just like to have some input PINs to keep logic 1 and some others to keep logic 0 when there are no connections. I do it by program instead of hardware currently and I'd like to know if there are some other better ways to achieve this.
I also have interests on the features that I haven't used before, so I'll have a try to know about the Bus hold after this busy period and give you a feedback if I have any conclusion.