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Date: Tue, 26 Jan 2016 21:18:40 +0100
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> >  Frankly, PCB is not a
> > high-end package and custom ASIC users are not our target audience.
> 
> But gschem can do schematic capture for ASIC even though that’s not its target. The difference is that gschem doesn’t limit what you can draw. It’s quirky and limits *how* you can express what you need, but I’ve never found it incapable of expressing a circuit. It gives you a few crude primitives and a few ways to compose more complex objects from simple objects. A few layers of that, and you have a 6000 component mixed-signal ASIC.

A few crude primitives to compose more complex objects is the only thing available in pcb and gerber which is the most common output. Basically layout data is just a bunch of drawing primitives. Footprint and via/pin/pad is more or less there just to hold together some primitives so movement of these objects get simpler.

Primitives are: lines, circles, circle segments, polygon and cut out of these. As is now there are limits on there and how they could be used in particular for via/pin/pad. Ideally it should be possible to use all of them at all layers: layout, footprint/element, via/pin/pad.



Nicklas Karlsson