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make your own dragline?

caver456

Is there a way to make a dragline that does not necessarily have anything to do with SDL connectivity?  To be clear, we would be making use of it to basically do SDL, and we do have VLS-XL licenses, but, the burden of maintaining SDL compliance throughout the flow is (naturally and necessarily) pretty high.  Our case is that we have done most of the layout in VLS-L (no connectivity) and now we want to use VLS-XL (SDL with draglines) to finish the top-level hookup.  Is there a way to just draw an initial line of just two vertices, and have each vertex become a child of whatever object it is over, and then have that line behave as a dragline as you move the parent objects?  This type of just-tag-n-drag would make life a lot easier.

  • forgot to mention a key part: our connectivity source is a netlist from a third part tool; we do not currently use cadence schematics.

  • in reply to caver456

    I'm not quite sure what you mean by a "dragline". VLS XL creates markers to represent flightlines for connectivity - this is done based on the connectivity in the database. It then extracts the physical connectivity to ensure that it matches the logical connectivity in the database.

    The connectivity doesn't however have to come from a schematic - any connectivity that is in the layout view will have the same effect,. So if you can define the connectivity using SKILL (e..g dbMakeNet and then use dbCreateInstTerm to put the terminals of your devices on the nets you create, then you will get flight line markers to show incomplete connectivity, and flight lines which move as you move the instances about.

    Also, if your connectivity reference is not a schematic but a SPICE netlist, you could import that SPICE netlist (even if  you don't create an editable schematic) using File->Import->SPiCE and then use that as the connectivity reference for your layout in VLS XL.

    If however you're asking for arbitrary flight lines without connectivity in VLS XL, then the answer is that you can't do that. I don't even know what that would mean - how would it know if a connection was complete or not unless it know what had to be connected?

    Regards,

    Andrew

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