Jim,
in answer to several of your points below I offer the following.
Hidden Pins: hidden pins are a special case in Protel. They are seemingly
assumed to be similar to power pins and they will netlist together with
other hidden pins which bear the same pin name (i.e. NC, N/C, Open, etc. are
the most common examples). Therefore there is basically an unwritten rule
with Protel that states "Use hidden pins at your own risk...".
There was an earlier suggestion that you may have this problem to blame for
your unwanted nets, doesn't really make sense because how would you have
placed an ERC on a hidden pin. Whoever posted it wasn't following the
details of your issue that close.
Connecting to symbols at other then 0 or 180 degrees: I don't know what you
have going on with this issue because I connect to symbols at 0, 90, 180,
270 degree entries all the time. Probably equally at 90 or 270 degrees to
the number of 0 or 180 degree connections.
Your problem with unwanted nets: this is a shot in the dark but minimally
possible, I have seen others do it before. By any chance do you have a wire
which is not intended to connect to these pins but passes the pin at 90
degrees on the same grid coordinate. Do you have the "Auto Junction"
feature turned on, this will show all pin connections if you did pass and
connect to the end of a pin which is not the first or last pin on the net.
(i.e. it will show intermediate pin connections but not the first or last
when you run a wire down a row of pins at 90 degrees to the pin
orientation.)
Did you drag symbols around and inadvertently slid a symbol up against a
wire which would make these types of connections? If your autojunction
feature is off, you won't get the junction dot to indicate this connection.
Brad Velander,
Lead PCB Designer,
Norsat International Inc.,
#300 - 4401 Still Creek Dr.,
Burnaby, B.C., V5C 6G9.
Tel. (604) 292-9089 direct
Fax (604) 292-9010
website www.norsat.com
> -----Original Message-----
> From: Jim Muehlberg [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, May 10, 2001 7:21 AM
> To: Protel EDA Forum
> Subject: Re: [PEDA] No ERC nets??
>
>
>
> 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
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