Re: [SI-LIST] : Problems with XNS

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From: DORIN OPREA (dorin.oprea@alcatel.com)
Date: Wed Jan 24 2001 - 09:00:57 PST


I had the same problem and this is due to the fact that the CAD is allowed to
route two traces that start from the same point with small separation or even
no separation at all. None the less the two traces represent the same signal.
XFX does not accept two conductors to touch.
Solution:
1) check your design in CAD tool for DRC on 'sleeves' (this is the name of the
configuration)
2) do not run xfx_lib which introduces approximations (rounds the spacing
between the conductors mainly to reduce the number of the configuration to be
simulated)
3) check the reference planes within the stack up and in quad.gcf file change
them to signal plane (I believe PLANE -> SIG_PLANE) in case you have routed
signals on reference planes.

Good luck,
Dorin

Dennis Tomlinson wrote:

> 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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