Nets with No Driving Source

Parent category: Violations Associated with Nets

Default report mode:


This violation occurs when a net in the design has been detected to have no driving source. That is, the net does not include at least one pin with one of the following electrical types:

  • IO
  • Output
  • Open Collector
  • HiZ
  • Emitter
  • Power

It is not uncommon for a net to not include a pin of one of these types. For example, it can happen when:

  • A net connects from a connector pin to an input pin.
  • A net connects from a series passive component (that has passive pins) to an input pin.


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:

Net <NetName> has no driving source (<PinList>),


NetName is the name of the offending net.

PinList is the comma-separated list of pins in that net.

Recommendation for Resolution

There are a number of different approaches to resolving this violation including:

  1. Edit the connector/passive component pin so that it is one of the electrical types listed above.
  2. Disable the Nets with No Driving Source violation check in the Error Reporting tab of the Options for Project dialog (Project | Content | ).
  3. Place a No ERC marker on the net (Home | Circuit Elements |  » Generic No ERC).


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