Missing Negative Net in Differential Pair

This compiler hint appears when a negative polarity net has not been detected for a particular differential pair object within a design. The positive polarity net for the pair does exist. The message is displayed in the Messages panel in the following format:

Missing Negative Net for differential pair PairName, positive net NetName,

where

PairName is the name of the differential pair for which a positive polarity net has already been defined (e.g. V_RX1)

NetName is the name of the positive polarity net (e.g. V_RX1_P).

Default Report Mode

Error

Recommendation

This violation typically arises in the following situations:

• A differential pair directive has not been attached to the negative polarity wire of the signal pairing. The required net label (e.g. V_RX1_N) has been attached to the wire as required.
• An appropriately-named net label (e.g. V_RX1_N) has not been attached to the negative polarity wire of the signal pairing. The required differential pair directive has been attached to the wire as required.

To resolve this violation, simply locate the negative wire object for the pair and ensure that both the net label and differential pair directive are attached and that the name of the net label is specified as required. The net label for the negative wire will be essentially the same as that for the positive wire, but with an _N suffix instead of an _P.