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Differential Pair routes with No Gap

Korey

Hi,

I'm using OrCAD PCB Designer and have created differential pairs. When I manually route the pair, the gap between traces is always zero no matter what I set the gap to in the contraints manager. I'm fairly new to this tool so I'm getting a littel frustrated why it does this. I even found another posting that some provided a .brd design with a diff pair and its own CM settings. When I deleted the traces to then reroute them, I found the same problem, the trace gap went to zero! Is this a license limitation or am I missing something? I've created CSet spacing parameters in the CM.

Thanks for any help that someone might be able to provide.

 -KC 

  • Korey
    fxffxf said:

    you need first create an Electrical cset -- On your design name in the Object column.right click the mouse and select Create -> Ecset.

    After the cset is created you can then set of min lines spacing at the cset level.You then would go the Net Work sheet and apply the cset your created to the diffpairs that require this spacing.

    I have created Electrical CSet and the Min Line Spacing still is grayed out. I've even created a seperate class and then made the diff pair a member of that class and it's still grayed out. I've pretty well lost all confidence in this tool. There must be some other limiting factor which shouldn't be for a professional license.

  • Korey

    oldmouldy said:
    I set the Min Line Spacing in the default Physical Cset, matches the Primary gap of 7, route as diff pairs with spacing now.

    Thanks for your efforts; however when I open it your routed diff pairs exist but the constraints don't when I open the CM and the Min Line Spacing is still grayed out. I'd be curious to know what happens if I try to import your .dcf file. I'm expecting that it would either choke or just grey them out. I could also export my contraints file (.dcf); however I would have expected that to be embedded in the .brd file.

    I created Electrical CSet as suggested earlier in the thread with no luck... still grayed out. I've attached a jpg of the CM with grayed fields in the Min Line Spacing.

    I appreciate all the help and if there is any final thoughts, please let me know.

    Sincerly,

    Frustrated Cadence User

  • steve

     Can you go to Help - About and upload a screenshot of the exact version of software that you are running.

  • Korey

    steve said:
    Can you go to Help - About and upload a screenshot of the exact version of software that you are running.

    Sure thing.... Here you go! Thanks Steve :-)

  • steve

     You are running the base release from the DVD. I would recommend getting the latest hotfix from your reseller which may/may not help. I also notice that you have been customizing the CM view. Try a View - Options and click on retore default settings and see if that helps. You shouldn't need to cusotmize the view to set MIn Line Spacing..

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