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can't route differential net

pupradar

HI, last year, after I set up differential pair and went to route it, the two line would go together with one click.

this year I changed a new computer and do the same thing, I setup the differential pair in constraint manager, and everything shows OK.I can see the setup pairs are right there in the constraint window, but when I begin to do the routing, the pair can't go together, they still like single routes, I mean one click can pick up only one net, not the pair together.

I opened the old board file which works fine on my old computer, it works good on my new PC. so did I miss something before setup the differential pair?.  

anyone can help?

cadence 16.1

Thanks

  • pupradar

    Hi, after every possible try, I found  when first routed out a small part of the net, stopped and then begin a new routing start from the small net, it works. but still feel it is not convenient. any suggestion?

  • AvengerThanos

    RMB and check whether you have selected single trace mode, in that case uncheck and route the DP

  • AvengerThanos
    in reply to pupradar

    RMB and check whether you have selected single trace mode, in that case, uncheck and route the DP

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