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From: Kai-Martin Knaak <knaak AT iqo DOT uni-hannover DOT de>
Subject: Re: [geda-user] Footprint Generator
Date: Wed, 04 Feb 2015 03:38:58 +0100
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Jason White wrote:

>> That said, I'd love to define this kind of oblate pins in pcb in a
>> proper way. But it is not possible due to format restrictions.
> 
> Kai-Martin, can you elaborate on this?

The pin statement of pcb does not know anything about layers. 
    Pin [rX rY Thickness Clearance Mask Drill "Name" "Number" SFlags]
Its geometry is the same on every copper layer. Its shape in mask is 
derived on the fly with the parameter mask_clearance. The default pin 
shape in pcb is "round" with a hole in the center. This can be changed 
into "square" with a flag. There is no way to make a pin statement refer 
to anything else but these two shapes.

The syntax of the pad statement defines a pad as the outline of a single 
straight line segment:
    Pad [rX1 rY1 rX2 rY2 Thickness Clearance Mask "Name" "Number" SFlags]
The first four parameters represent the coordinates of start and end of 
the segment relative to the origin of the footprint.

Pads are restricted to either top or bottom layer. There is no way to put 
pads on inner layers. There is also no way to make asymmetrical pins or 
pads.

---<)kaimartin(>---

PS: The naming scheme of the pcb manual irritates me time and again. A 
"footprint" or an "element" are not quite the same as in common languages. 
The notion of "solder side", "solder layer" and "component side" coexists 
with "top side" and "bottom side".
 
-- 
Kai-Martin Knaak                                  tel: +49-511-762-2895
Universität Hannover, Inst. für Quantenoptik      fax: +49-511-762-2211	
Welfengarten 1, 30167 Hannover           http://www.iqo.uni-hannover.de
GPG key:    http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmk&op=get