Contents
How to create differential pair routing rules in Altium?
If the Net Class is not included, individual Differential Pair Routing rules will be created for every differential pair under the blanket. A Blanket can be used to configure multiple nets as differential pair members, create a Net Class of these nets, and apply a Differential Pair Routing design rule.
How to create net pairs in Altium Designer 21?
The dialog is accessed from the PCB panel by clicking the Create From Nets button (lower left area of the panel) when in Differential Pairs Editor mode. The filters at the top of the dialog can be used to show net pairs based on existing net names.
How is route length calculated in Altium Designer 21?
Route length calculations for xSignals include the length of the path through the series component, as shown by the thin line that is displayed when an xSignal is selected in the xSignals mode of the PCB panel. These differential pairs have been defined as xSignals; the route length includes the series component.
How to create a differential pair in nets?
The Create Differential Pairs From Nets dialog provides controls to create differential pair objects using net names conforming to a naming convention with a common prefix, followed by a consistent positive/negative suffix, for example, TX0_P and TX0_N.
When to use same net only clearance in Altium?
Use this constraint to configure the clearance when the nets in the differential pair must be closer together than allowed by the general clearance. For a defined Same-Net Only Clearance rule, the general approach is that if two objects are touching (i.e. connected), then they are not deemed to be in violation of the rule.
When to use xsignals in differential pair routing?
If your differential pairs have series components in the signal path, you might find it worthwhile to create xSignals. An xSignal is a designer-defined signal path between two nodes. They can be two nodes within the same net or they can be two nodes in different nets.