On Wed, 8 Jul 1998, David VanHorn wrote:

> >Making the Schematic Library part is only a 5 minute job,
> >and has the benefit of letting you arrange the
> >pins.  For example all the inputs on the left
> >and the outputs on the right often makes the
> >most understandable schematic.

Yes.

> For anything larger than simple gates, I always libedit my own.
> The thing is, a schematic (unlike most you've seen) isn't just a
> rats nest of wires designed to confuse the hell out of you.
>
> It's supposed to be a logical flow of information designed to
> take you quickly to the part of the circuit you're interested in,
> and to tell you what signals are involved in that portion of the
> circuit, and where they come from, and go to.

I *stronly* prefer the kind of schematic that matches the layout or at
least physical pin-out. It makes troubleshooting on the physical thing
much faster. For this, I have to redo the libraries for most gates in
Orcad for example.

In fact, I think that the logical functionality of a unit should emerge
from a block diagram, not from the schematic. That one is for other
purposes (such as manufacturing and troubleshooting).

Peter