Mismatched Bus or Wire Object on Wire or Bus

Parent category: Violations Associated with Buses

Default report mode:


This violation occurs when a wire object is incorrectly connected to a bus, or a bus object is incorrectly connected to a wire. For example, a port, A, might be connected to a bus, but the correct bus label syntax (e.g., A[0..1]) has not been entered for the port's name. In effect, the port is a single signal (or wire) object that is now erroneously connected to a bus.


If compiler errors and warnings are enabled for display on the schematic (enabled on the Schematic - Compiler page of the Preferences dialog), an offending object will display a colored squiggle beneath it. A notification is also displayed in the Messages panel in the following format:

<ObjectIdentifier> at <Location> placed on a <ObjectType> ,


ObjectIdentifier represents the mismatched object, which can be either a bus or wire object (e.g., pin, port, power port, net label, off-sheet connector, sheet entry). The identifier will appear in one of the following two formats:

  • For a bus – Bus <Object> <Name> (e.g., Bus Net Label GND_BUS[..]).
  • For a wire – Wire <Object> <Name> (e.g., Wire Port TXD).

Location is the X,Y coordinates for the object's electrical hotspot.

ObjectType is the object on which the offending object has been placed – either a wire or a bus.

Recommendation for Resolution

With the violation selected in the Messages panel, use the Details region of the panel to quickly cross probe to the offending object. To resolve the issue, consider the following:

  • Is the connection correct? – should a bus connecting to the object really be a wire and vice versa?
  • Is the object defined correctly? – for a bus object, ensure that the object's name is specified using the correct bus syntax, in the form <Name>[<LowIndex>..<HighIndex>] or <Name>[<HighIndex>..<LowIndex>]. For example, a byte-wide data output port might be specified as DAT_OUT[7..0]. For a wire object, ensure that the object's name defines a single signal and is not defined using bus syntax.


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