Nets with no Driving Source

This compiler hint appears when a net in the design has been detected to have no driving source. The message is 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.

Default Report Mode

Warning

Details

This violation occurs when the net does not include at least one pin 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 (which have passive pins) to an input pin.

Recommendation

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.
3. 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.