Multidrop bus
A multidrop bus allows parallel communication between items on the System Architecture Diagram.
Use the 
icon on the System Architecture Diagram tab to
add a multidrop bus to the diagram, or you can drag a multidrop bus from the dictionary.
icon on the System Architecture Diagram tab to
add a multidrop bus to the diagram, or you can drag a multidrop bus from the dictionary.When you have added a multidrop bus, you can change it both via the diagram using the multidrop bus Property pages and the context menu.
To describe the protocol, speed and width of the multidrop bus attach a
multidrop bus type through the Options tab of the multidrop bus Property pages.