At 11:44 AM 8/19/2003, Tony Karavidas wrote:
Passive makes sense on connectors.

Yes. In the absence of easily editable and displayable pin electrical types, passive is what works.


I too would not actively label each one based on the signal. What a pain that would be.

Not really, at least not sometimes. If you have a board that is connected to many other boards in various projects, it would not be a difficult thing to make up a connector symbol with appropriate electrical types, and place net names, keeping this as a schematic sheet to be copied and pasted into other projects. Having correct electrical types helps avoid schematic errors. For example, if a line is driven off-board, it would be treated as an output, and then ERC would flag any outputs or certain other types connected to it.


This is doable now, it would get easier with easier editing and review of pin electrical types. Having a reversal tool that would take such a part and "invert" the types, where that makes sense, would again make this easier, i.e., the connector from one board could be inverted and used at the other end of the cable, for the connected board.

However, I think a passive connector pin tied to an input pin should suppress a warning message from ERC.

That is the default ERC setting. Passive can connect to anything, it will satisfy an input and it can be connected to an output, etc. But the down side of using passive for a connector pin is that this pin may actually *not* be passive, i.e., it drives or it needs to be driven, etc. By using passive one has made the creation and use of the symbol easy, but at the cost of more detailed error checking. Nevertheless, I've certainly done it this way most of the time. Out of the box, connector symbols should, IMHO, be passive, not In/Out, which is wrong more often than not.


Are you saying you get warnings/errors in that case?

If he is, he has an ERC matrix set to generate such a warning/error. Easy to fix.




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