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I also encountered this error (before this error It's ok), I checked as you did up , but the reason is software ,after I reinstalled the ise ,It worked ok again!, try it .
It's a good idea to define a fence. Sometimes You must be familiar with the chips with tens of connections before you set the rules which will take much time comparing to routing manually. So I prefer to route with "push and drag" when the connection is not very obviously, but I don't want to...
How to use the command "bundle" to route a group of bus, sometimes it can't autoroute unless you drag them out to make a man-made bus, my questions is "How can I let them be autorouted without my pre-routed?" such as a bundle from BGA.
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