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A User-defined FromTo allows you to create specific net topologies within a design giving you total control over the arrangement or pattern of pin-to-pin connections in a net. They are different from system-generated FromTos, added and arranged by the PCB Editor to give the shortest overall connection length in each case - a net topology referred to as Shortest. Displayed in the workspace as pin-to-pin connection lines, FromTos are collectively referred to as the 'ratsnest.'
User-defined FromTos can be added for part or all of a net using the From-To Editor available in the PCB panel.
A user-defined FromTo object cannot be edited with respect to properties in the usual manner. It cannot be selected in the workspace, has no corresponding mode in the Properties panel and cannot be edited graphically.
FromTos can only be viewed when the PCB panel is configured in From-To Editor mode.
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