[PCB_FORUM] Re: How to connect Two thru-hole pads that are placed same location.

Thanks for all the suggestions.
We will try a few suggestions after completing the design.
As of now, we removed nets from second schematic symbol...thus removing second set of rats. Placed both connectors on each other as before. Then waived DRC's. Both connectors still get passed to the BOM except if one is set as a no-pop. (BOM_IGNORE). 

Mark



Les Wong wrote:

Mark:

Here is what we do:
1. one padstack is thru hole pin, lets say for the top connector
2. one padstack is smt, for the bottom connector
3. you can create a physical region around the connectors
4. you will need to go into constraint manager and change the Allow-> Pad-Pad Connect 
to ALL_ALLOWED for each net on the connector

Les



    --- On *Wed, 8/27/08, Dave Seymour /<dseymour@xxxxxxxxxxx>/* wrote:

        From: Dave Seymour <dseymour@xxxxxxxxxxx>
        Subject: [PCB_FORUM] Re: How to connect Two thru-hole pads
        that are placed same location.
        To: icu-pcb-forum@xxxxxxxxxxxxx
        Date: Wednesday, August 27, 2008, 8:02 AM

        That’s fine.


        So, you need a work around in Allegro to get rid of the
        ratsnest lines.


        Make sure you leave “stretch etch” box checked when you move
        the connector back into position.


        Which was the original idea below:


        Mark,


        I never have done this, but it seems like it might work.


        Move one of the connectors off board and make the connections,
        then move the connector back into position.


        If I had to guess, Allegro will keep the connection.


        Just an idea, Hope this helps.


        Dave Seymour

        Ixia

        919.267.4840

        ------------------------------------------------------------------------

        *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx
        [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of
        *Mark Salberg
        *Sent:* Wednesday, August 27, 2008 10:58 AM
        *To:* icu-pcb-forum@xxxxxxxxxxxxx
        *Subject:* [PCB_FORUM] Re: How to connect Two thru-hole pads
        that are placed same location.


        Our schematic feeds the BOM. Must have both in the schematic
        for different populations.


        Dave Seymour wrote:

        Well, one could make a special padstack and remove the drill,
        just like an SMT pad and waive the DRCs.


        IMHO - The best way to would to let the BOM control which
        connector is populated and only have one connector on the
        schematic.


        In some backplane applications, the pins are really short and
        the primary side connector and the secondary side connector
        share the same hole.

        On this type of backplane we have the BOM control the
        connector and the schematic shows only one connector, even
        though both connectors (top, bottom) are populated.


        D


        Dave Seymour

        Ixia

        919.267.4840

        ------------------------------------------------------------------------

        *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx
        <mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx>
        [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of
        *Gerry Meier
        *Sent:* Wednesday, August 27, 2008 10:34 AM
        *To:* icu-pcb-forum@xxxxxxxxxxxxx
        <mailto:icu-pcb-forum@xxxxxxxxxxxxx>
        *Subject:* [PCB_FORUM] Re: How to connect Two thru-hole pads
        that are placed same location.


        What is that doing to do to your ”Drill file” Double drills??


        Gerry Meier, Sr. PCB Designer

        Freedom CAD Services. Inc

        Voice: (256)776-7470 or (603) 864-1350

        Email:gerry.meier@xxxxxxxxxxxxxx
        <mailto:Email:gerry.meier@xxxxxxxxxxxxxx>

        visit us at http://www.freedomcad.com


        ------------------------------------------------------------------------

        *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx
        <mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx>
        [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of
        *Dave Seymour
        *Sent:* Wednesday, August 27, 2008 9:32 AM
        *To:* icu-pcb-forum@xxxxxxxxxxxxx
        <mailto:icu-pcb-forum@xxxxxxxxxxxxx>
        *Subject:* [PCB_FORUM] Re: How to connect Two thru-hole pads
        that are placed same location.


        Mark,


        I never have done this, but it seems like it might work.


        Move one of the connectors off board and make the connections,
        then move the connector back into position.


        If I had to guess, Allegro will keep the connection.


        Just an idea, Hope this helps.


        Dave Seymour

        Ixia

        919.267.4840

        ------------------------------------------------------------------------

        *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx
        <mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx>
        [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of
        *Mark Salberg
        *Sent:* Wednesday, August 27, 2008 10:11 AM
        *To:* icu-pcb-forum@xxxxxxxxxxxxx
        <mailto:icu-pcb-forum@xxxxxxxxxxxxx>
        *Subject:* [PCB_FORUM] How to connect Two thru-hole pads that
        are placed same location.


        We have two thru-hole connectors placed on top of one another.
        One populated, one not.
        PROBLEM: We can not get rid of rats, because two pins / pads
        at same X:Y.

        *Any ideas how to get connection to both pads?*

        We decided to remove net names from one of the connectors in
        the schematic, to allow us to connect to one pad on board.
        Then waive DRC's.
        We are using V.15.7 and Concept front end.

        Regards,
        Mark


        This correspondence and any attachments are considered
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