> I remember the old Quake maps had to be "sealed", so any loose seam
> would cause problems. Because the map editor doesn't know what you
> meant to be outside/inside, etc, the map editor had a feature to deal
> with this, it would create a line that would start in one area, and
> head to another. All you had to do was follow the line.
>
> A similar solution in PCB would be neat. if VCC and GND are shorted,
> pick a random GND pin and a random VCC pin. Find a path between them
> and show it as a orange dotted line. This could later be extended to
> find either the shortest orange dotted line, or the point on the board
> where several such lines meet.
Yes, plenty of possible algorithms - the one that I though of was:
For each element in the set of elements in the two shorted nets
{
Temporarily disable this element (ie consider it an open circuit)
If (the two nets are still shorted)
{
re-enable this element;
continue;
}
re-enable this element;
Visually highlight this element;
Alert user("This is the offending element");
}
The algorithm fails if the short consists of parallel shorting
elements - but the very common case is just a single fault, very often
that via with extra thermals on a wrong layer.
If only I had time for more than pseudo code at the moment!
Stephen Ecob
Silicon On Inspiration
Sydney Australia
www.sioi.com.au
$39 Spartan 6 board with 32MB DDR DRAM ?
http://www.sioi.com.au/shop/product_info.php/products_id/47
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