Abd ul-Rahman Lomax wrote:
>
> At 04:14 PM 5/9/01 -0600, Jim Muehlberg wrote:
>
> >Just to clarify, I do not have a "NO ERC" net! Upon closer examination,
> >though, not all of the no ERC points netlisted. Just a few did this.
> >More erratic behavior if you ask me!
>
> The plot thickens. One possibility is that Mr. Muehlberg expects something
> with a No-ERC directive on it to not netlist.
>
> But we should probably assume that he has placed No-ERC directives to
> suppress unconnected pin warnings. Thus his comments would make sense. So
> the problem here has *nothing* to do with No-ERC directives; that was a red
> herring. Rather, something is causing pins which he thinks should be
> unconnected to be connected.
>
> The suggestion to chop the schematic is generally a good one. It can help
> to narrow down a problem to a few primitives by doing a binary chop (i.e.,
> half, determine if either or both or neither half has the behavior, then
> chop again in half accordingly, until only a few primitives are left).
>
> But this may not be necessary. I would look at exactly what pins were
> netlisted, and what name was assigned to the net. I would also show hidden
> pins and see if there are any that might be causing the problem. It is also
> not utterly impossible that someone could assign some wires the background
> color; I think it is easy to anticipate what would occur if this were done.
> I haven't tried it; Protel should lock this out, but I wouldn't blame then
> for not doing it. To detect these, I would select all wires, which should
> make any invisible wires visible.
>
> [EMAIL PROTECTED]
> Abdulrahman Lomax
Thanks for all the responses. More clarification... (I use the
synchronizer) The pins in question were not wired to anything. Being a
relative novice, I hadn't deciphered the rule matrix, so whenever I had
an unused pin, I would just place a no erc directive. Turns out that's
not necessary, of course, if the pin is passive. I understand that if a
wire is connected, it will netlist regardless of the no erc. Also, I
had no wires colored as background. I wish I had time to mail the
schematic to all that requested (We're National Science Foundation, no
secrets here!) but I just got rid of the no erc's and re-netlisted.
I've experienced some strange behavior when synchronizing. Especially
confusing is that a wire connecting directly to the end of a resistor
(RES1) at a 90 degree angle won't netlist. The wire must connect at 0
(or 180, dependig on your perspective) degrees. I've also found that
unconnected hidden (passive, unnamed, un-associated with a net) pins are
netlisting in some cases. Could it be that if a wire passes by the
position where the pin is hidden makes a connection?
I know that without distributing the schematic, you can only guess at my
problems, if indeed they are problems, not features!
Thanks again!
--
Jim Muehlberg
Electrical Engineer
LO/IF Group
National Radio Astronomy Observatory
P.O. Box O
1003 Lopezville Rd.
Socorro, NM 87801
P: 505-835-7140/7195
F: 505-835-7027
http://www.aoc.nrao.edu/~jmuehlbe
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