[PCB_FORUM] Re: IPC-D-356 Netlist
- From: "Kevin McCowan" <kmccowan@xxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Tue, 12 Oct 2004 14:21:23 -0400
Try to get the board house to locate the shorts for you
and see what you have in the design in that location and try
to either fix or at least understand why they are being
classified as shorts. Sometimes it is just that way
when you do something unusual and it takes the software
a while to "catch up" and define what you are
doing properly. Or at least the way you want it to.
Sometimes you cannot get rid of the problem and
have to learn to live with it.
Good luck,
Kevin McCowan
Sr. PCB Designer
TSI Telsys
> -----Original Message-----
> From: Mark Salberg [mailto:msalberg@xxxxxxxxxxxx]
> Sent: Tuesday, October 12, 2004 1:04 PM
> To: Cadence User Group
> Subject: [PCB_FORUM] IPC-D-356 Netlist
>
>
> Hello all,
>
> We are creating and sending IPC-D-356 netlist with our gerber
> files. We also add "expected shorts / open circuits" in the
> header of the netlist. Some of our boards require internal
> routed channels (ncroutes) that have
> clines terminating into the channel. (guarding purposes).
> I know, sounds odd...but still a requirement for some applications.
>
> PROBLEM: I received a call from our board fab that the
> IPC-D-356 netlist
> included more than "expected shorts" due to the ncroutes on board
> geometry outline layer is included in each artwork film files. They
> compare their gerber generated netlist to our IPC netlist to
> find this.
>
> I know we could remove board outline from the gerber files, but even
> when deleting all but one artwork film file, the netlist is still
> approximately the same size. Indicating to me that IPC-D-356
> is running
> against the .brd and NOT the artwork film files. So, removing board
> outline from gerber files would not make any difference.
>
> I do not see any indication of "extra shorts" in the IPC
> netlist or log
> file.
>
> Any ideas how we can keep this from happening in the future?
>
> Thanks,
> MArk
>
>
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