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AR# 45887

13.3 Schematic - Dragging net endpoint of I/O port onto another net causes Internal Error : Join Branches


I have added I/O ports to my schematic design and want to connect them to an existing net.

To do this, I select the endpoint of the wire connected to the I/O port, and drag and drop the endpoint on another wire.

As I do this, I see a pop-up dialog box that says, "Internal Error: Join Branches." Additionally,thenet whose end point was being dragged disappears, and "Undo" will not restore the wire.


This error will occur if:

  • The net connected to the I/O port has only onesegment (No bendsand thewire was added all at the same time) and;
  • The point where thenet endpointis dropped is in direct line with the existing net segment.

To work around this issue, a user can do one of the following:

  • Use the "Add Wire" command to connect the two existing nets
  • Drag and drop the net end point a short distance from the original location, and then drag and drop the endpoint in thedesired location on the other net.

This issue will be fixed in ISE Design Suite 14.1.

AR# 45887
Date Created 01/18/2012
Last Updated 05/19/2012
Status Active
Type Known Issues
  • ISE Design Suite - 13.3