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signal line connected to a ground [message #169776] Mon, 27 February 2017 18:29 Go to next message
Robert Oppenheimer
Messages: 4
Registered: November 2016
Junior Member
I've gotten myself into a bit of a bind and need to sort this out.

I have a connector for a module and I wanted to name the connector pins
the module's signal names. Where I ran into problems is when a signal
line was to be grounded. Schematic shows the pin with module's name as
desired and also shows a connection to ground. Trouble is that a ground
was never routed to the board.

Any ideas what went wrong and how I can prevent this from happening on
the next release?

TIA Oppie
Re: signal line connected to a ground [message #169785 is a reply to message #169776] Mon, 27 February 2017 22:27 Go to previous messageGo to next message
Jorge Garcia
Messages: 1294
Registered: April 2010
Senior Member
On 2/27/2017 1:29 PM, Robert Oppenheimer wrote:
> I've gotten myself into a bit of a bind and need to sort this out.
>
> I have a connector for a module and I wanted to name the connector pins
> the module's signal names. Where I ran into problems is when a signal
> line was to be grounded. Schematic shows the pin with module's name as
> desired and also shows a connection to ground. Trouble is that a ground
> was never routed to the board.
>
> Any ideas what went wrong and how I can prevent this from happening on
> the next release?
>
> TIA Oppie

Hi Oppie,

I'm sorry to hear that. The first thing that comes to my mind is that
you may have hidden airwires.

You can check by clicking RATSNEST and then looking at the bottom left
of your screen. If you see the word "hidden" anywhere there, than that
would explain the unrouted airwires. Type RATSNEST * followed by the
enter key to reveal all of the airwires.

The other possibility is that the airwire was not properly defined in
the first place. In your schematic use the show command and click on the
nets that never routed both pins and the net wire itself should
highlight. You can also try moving the part, if the nets follow then it
is properly connected otherwise that's your issue.

Let me know if there's anything else I can do for you.

Best Regards,
Jorge Garcia
Autodesk Support

--
We have a new forum here <http://forums.autodesk.com>
Re: signal line connected to a ground [message #169790 is a reply to message #169785] Tue, 28 February 2017 07:23 Go to previous messageGo to next message
rachaelp
Messages: 596
Registered: March 2015
Location: UK
Senior Member
Hi Oppie,

In addition to checking what Jorge has suggested I wonder if you connected the module up to ground symbols, initially correctly connecting to the globally named ground net, and then you renamed the nets from that to the module name and therefore disconnected them from ground.

For global nets like power and ground I would either add separate text to annotate the connections at the connector or just accept that the names match the global nets on the board rather than trying to make them conform to the modules pin names.

Best Regards,

Rachael
Re: signal line connected to a ground [message #170009 is a reply to message #169790] Fri, 10 March 2017 22:19 Go to previous message
Robert Oppenheimer
Messages: 4
Registered: November 2016
Junior Member
On 2/28/2017 2:23 AM, Rachael wrote:
> Hi Oppie,
>
> In addition to checking what Jorge has suggested I wonder if you connected
> the module up to ground symbols, initially correctly connecting to the
> globally named ground net, and then you renamed the nets from that to the
> module name and therefore disconnected them from ground.
>
> For global nets like power and ground I would either add separate text to
> annotate the connections at the connector or just accept that the names
> match the global nets on the board rather than trying to make them conform
> to the modules pin names.
>
> Best Regards,
>
> Rachael

I didn't want to take the global name because it was important to me to
recognize this pin as an I/O that was grounded as opposed to ground.
Probably the most straightforward way then is to use a zero ohm resistor
or a solder jumper.

Was juggling a large number of signals and missed fixing that along with
another engineer that helped with the review... Oh, well, boo boo
happens. Probably needed to re-spin the board before the production
release anyway. Sadly, I am getting very good at putting jumpers on
0.5mm pitch devices.

Oppie
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