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Parent category: Violations Associated with Nets
Default report mode:
This violation appears when the polarity of a differential pair net is not the same as that of the differential pair pin to which it is connected. For example, the positive net is connected to the negative pin, or vice-versa.
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. Hovering over the object will display a pop-up hint that summarizes the violation. A notification is also displayed in the Messages panel in the following format:
Inversed connection on differential pair
<PairName>: net
<NetName> is connected to pin
<PinDesignator> (
<Polarity>)
where:
V_TX1
)V_TX1_P
)E6
)negative
).Use the Details region of the Messages panel to quickly cross probe to the differential pair pin to which the connection has been made. Ensure that the net label attached to the connected wire is the same polarity as that of the pin. For example if the pin name is IO_L02N_0
and the net label is V_TX1_P
, change the net label to V_TX1_N
.
If a pair of violation messages of this type appears - one for the positive net of the pair attached to the negative pin of the device and one for the negative net of the same pair attached to the positive pin - simply swap the attached net labels around.
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