Re: gEDA-user: 74xx symbols

[Charles Lepple <clepple@ghz.cc>]

On Wednesday, July 31, 2002, at 10:36 AM, Jim Battle wrote:

> The most obvious is for routing, in order to minimize signal crossings.   
> Likewise, in the schematic editor pin swapping in nice to minimize the 
> signal crossings there too.
>
Having used such a feature in PADS, it appears that the biggest hurdle to 
making this useful for PCB layout is the robustness of the link between 
the PCB layout tool and the schematic capture program. Otherwise, if you 
swap pins on the PCB and the change is not reflected in the schematic, 
things get confusing the next time that the board is routed.

PADS handles this with an ECO mode that records all such changes made in 
the layout program, and the ECO file can be imported into the schematic 
capture program to back-annotate the schematic. I don't believe such 
functionality exists in PCB, although I have not messed with the latest 
version.

--
Charles Lepple <clepple@ghz.cc>
http://www.ghz.cc/charles/