Re: [SI-LIST] : Problems with XNS

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From: Dennis Tomlinson (det@tellabs.com)
Date: Wed Jan 24 2001 - 07:05:30 PST


Subramanya,

1. Check your stackup specification for any dielectrics of zero thickness.
2. Sometimes a trace segment of greater width can get laid down on top
   of another. It's no problem in the Gergers, but I believe XNS will
   choke on it.
3. If you're doing off-grid routing, a "jog" of less than one trace width
   from off-grid to on-grid can confuse XNS.
4. If you're doing area fill and signal traces on the same layer, XNS can
   improperly translate this into "touching" conductors. We have a trouble
   call in on this one.

Best of luck,

Dennis & Mike
   
> Hello all,
>I'm using View Logic's XNS for the post-route simulation of my boards.
> And facing a peculiar problem. I'm getting an error message while
> trying to run the xfx command to generate Transmission line Parameter
> (.tlp) file .
> The error message is : " conductors <num> and <num> are touching in
> CONFIG <num> "
> I tried commenting this particular configuration in the .xfx file.
> But this lead me to errors at a later > stage (while building the
> database for analysis in XNS).
> Is there anybody out there who faced the same problem with their
> design ? if yes, what's the remedy ?
>
> Thanks in Advance
> Subramanya

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