Nets with no Driving Source
Parent category: Violations Associated with Nets
Default report mode: 
Summary
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
- Open 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 (which have passive pins) to an input pin.
Notification
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>)
where
- 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:
- Edit the connector/passive component pin so that it is one of the electrical types listed above.
- Disable the Nets with No Driving Source violation check on the Error Reporting tab of the Options for Project dialog (Project » Project Options).
- Place a No ERC marker on the net. It is recommended that a Specific No ERC marker be used as this can be configured to allow this condition to exist, but that net can continue to be checked for all other possible violation conditions.