altium
I am relatively new to Altium, and I am running into the following errors when compiling my schematic:
What I am trying to do is connect multiple sheets to the same signals, SDI and CLK. Am I doing something wrong? It is a flat hierarchy, I have set the scope to "Flat (Only ports global)". Below are two sheets of my schematic that uses SDI and CLK signals
Sheet1:
Sheet2:
That is indeed called a "Room".
Rooms are relevant if you're doing multi-channel design, as they let you copy the layout between channels.
It's also completely normal.
If you want to disable it, it's very easy to do:
Alternatively, you can just delete the room, but it will come back next time you synchronize the schematic to the PCB.
It looks like you're trying to use Kelvin connections so that your sense traces don't carry any current. To do this best in Altium, use a "net tie" component. It allows you to connect two nets together at a specific point on the PCB. Google "Net tie" and Altium and you should be able to find what you need.
Best Answer
With "Flat (Only ports global)" scope selected, "...net labels are local to each sheet; they will not connect across sheets. All ports with the same name will be connected, on all sheets." - Altium "Multi-Sheet Design"
This seems like it should be OK for what you are trying to do, but I think in this type of design setting, there must be a 1:1 relationship of Input and Output port. In the flat design case, the input ports are connected to each other, hence the "multiple input ports" error. Here are a couple things you could try:
This requires you to use a Top sheet to control the design hierarchy. Review "5.1.3 Constructing the top sheet" in the previously mentioned training module. For what it's worth, all of my designs are of this design setting.
This may make the error go away (due to your project's Connection Matrix), but it might not make sense from a real-world viewpoint. The CLK/SDI lines are most certainly not bidirectional. This might cause problems when you are in a design review and have to explain why you've marked everything as bidirectional.
Stick with your flat design setting, but tell Altium to shove it by editing the Error/Warning connection matrix:
Now multiple input ports will only be reported as a warning, not a show-stopping error.