At 11:05 AM 6/14/01 -0500, David Cary wrote:
>"Abd ul-Rahman Lomax" <[EMAIL PROTECTED]> on 2001-06-13 12:59:12 AM reported
> >If both pads have the same name in the footprint, and the pads do not have
> >any net assignment, Update or Netlist load will assign both of them the
> >same net. So far, so good. But Updating again or loading a Netlist again
> >will *remove* both net associations. And if one has the net and the other
> >is no-net, each load will swap the associations.
Okay, I was half right and half wrong.
>I've never seen this after I installed Protel service pack 6.
I'm not sure when it was fixed, but the Synchronizer (the Update process)
behaves correctly. If there are multiple instances of a pad, they are
loaded together and it sticks through subsequent updates. However the
Netlist Load process still has the bug. This is a case where the net
connectivity produced by Update PCB in a schematic can be different from
that produced by executing Design/Load Nets on a netlist produced from the
same schematic.
Maybe someday they will get it *completely* right. For now, however, it's
good to know we can use the multiple pad feature if we stick with the
synchronizer.
(An example of a use of multiple pads. You have an SMB connector which
consists of a central pin, we'll call that CENTER, and four ground pins
surrounding it. The normal schematic symbol for this has two pins, say they
are CENTER and GROUND. This symbol has been used in many years in many CAD
systems....
One can simply name the four outer pins GROUND, and all the connectivity
will be correct with no further fuss. Previously, a workaround was to add
extra pins to the schematic symbol, perhaps the grounds would be named
GND1, GND2, GND3, GND4. That is no longer necessary. It will still work, of
course, with the appropriate footprint....
[EMAIL PROTECTED]
Abdulrahman Lomax
P.O. Box 690
El Verano, CA 95433
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