At 01:38 PM 6/13/01 +1000, Dan Klepper wrote:
>-----Original Message-----
>From: Bruce admin [mailto:[EMAIL PROTECTED]]
>
>I have run into a situation where I have a thru hole component that needs
>surface mount pads associated with them also. I have created the component
>in the library and then attached copper pads to the same area as the thru
>hole pads. When I import the component into the PCB layout I get design
>errors associated with it.
Yes. You will, under some conditions. It's complicated, and there is a bug.
Protel assumes that two pads in contact with different nets, or one with a
net and the other with no-net, is an error, even if the pads are in contact
in the footprint library. It would be somewhat difficult for them to do
otherwise, for reasons I won't go into at the moment.
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.
If the pads have different names, and a pin is made on the component
coincident with the original pin, both pads will behave correctly.
Another way to go is to use fills to implement the additional surface mount
pads. These can then be manually assigned the appropriate net. It will
normally stick through subsequent net loads.
>On another note, and in the same design, I have manually swapped power pins
>on a component. One of the power pins should be connected to an internal
>plane, but it will not connect properly (no thermal relief, copper pours
>around the via). All of the power pins in the vicinity of this via connect
>properly, however, nothing I do seems to work to get this via to connect.
>Any thoughts on this one?
Since I don't understand what was done, I can't answer this one. Explaining
what it means to "manually swap" power pins would help.
[EMAIL PROTECTED]
Abdulrahman Lomax
P.O. Box 690
El Verano, CA 95433
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