allegrocadenceedaorcad
I'm doing a schematic on OrCAD and when I did the Design Rules Check I got a warning that says:
Checking Electrical Rules
WARNING(ORCAP-1608): Net has no driving source N30274
I have a fairly large circuit that spans three pages, so is there any way that I could search for where the error happened? And what does this warning mean? I don't have any part called N30274.
Does your part have both pin names and pin numbers like this? In the case of the picture below the numbers inside the part are the pin names and the numbers on the pins are the pin numbers.
You can overlap the ground plane pad onto the six pins. I can't recall if Cadence complains about this, but I know I've done it.
The alternate way, without waived errors, is to make the custom shaped pad then have one pin associated with it. There isn't much point in duplicating the information otherwise.
Best Answer
N30274 is the name of the net connecting two parts. If you go to your top level in the design explorer and do a search with that name you will find it. Orcad auto generates net names for every wire connection you make.
Like Andy says it's trying to warn you that you have an input with no output, but it's probably not an issue. If you edit the part in the library and right click on the pin I think you can see properties. One will have a pull down for input, output, passive, etc. if you set it to passive for both parts connected to that bet the warning will go away.
Personally I never use this feature and just set things to passive all the time, but it could be useful say to protect yourself from hooking up a serial port wrong. It only makes sense if when you build all your library parts that you set the correct attribute for each pin. Otherwise you'll always find warnings like this.