[PCB_FORUM] Re: 15.2 differential pairs and spacing setup

Thanks to everyone for their help. Yes, I just needed to set the min
line spacing in CM.

 

I did that and the DRC's are gone...

 

Thanks again...Diane.

 

________________________________

From: Mike Golding [mailto:Mike.Golding@xxxxxxxxxx] 
Sent: Wednesday, January 26, 2005 6:49 AM
To: 'icu-pcb-forum@xxxxxxxxxxxxx'
Subject: [PCB_FORUM] Re: 15.2 differential pairs and spacing setup

 

Make sure you put in a min line spacing in CM. Just make min line
spacing the same value as your primary gap. I just went thru the same
thing. The way I understand it is if you don't have a min line spac in
CM the tool looks at your net spacing type for line spacing even within
the pair.

 

 

Mike Golding                   \  mike.golding@xxxxxxxxxx 
PCB Designer                  \  +1-920-969-6114 Phone 
Plexus Technology Group  \ +1-920-428-3280 Cell 
55 Jewelers Park Drive       \  +1-920-751-5366 Fax 
Neenah, WI  54957             \  www.plexus.com 

        -----Original Message-----
        From: Dickoff, Diane J [mailto:diane.j.dickoff@xxxxxxxxx] 
        Sent: Tuesday, January 25, 2005 6:24 PM
        To: icu-pcb-forum@xxxxxxxxxxxxx
        Subject: [PCB_FORUM] Re: 15.2 differential pairs and spacing
setup

        Paul---thanks for getting back to me. But I am getting DRC's
when I tried to use the net spacing type with my diff pairs.

        I have 7mil gap and 5 mil width in my diff pair (from CM). I
have several of these that need 20 mil spacing between these diff pairs.


        The DRC on the diff pair says I have 7 mil spacing and the
net_spacing requires 20.

         

        Thanks, Diane.

         

        
________________________________


        From: Paul_Keefe@xxxxxxx [mailto:Paul_Keefe@xxxxxxx] 
        Sent: Tuesday, January 25, 2005 7:49 AM
        To: icu-pcb-forum@xxxxxxxxxxxxx
        Subject: [PCB_FORUM] Re: 15.2 differential pairs and spacing
setup

         

        
        Yes Diane that will do it, we have these constraints all of the
time and it works very well.  The Router 
        will also do a very good job on them. 
        
          Good luck 
        
        Paul Keefe
        
        
        

Dickoff, Diane J 
Sent by: 

01/24/2005 05:55 PM 

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[PCB_FORUM] 15.2 differential pairs and spacing setup

 

 

 

        
        
        
        I know this has been discussed before but I want to make sure I
am doing this correctly. 
          
        I have a large number of differential pairs with different
spacing within the diff pairs. But I also need different spacing between
the sets of diff pairs. 
          
        For example 
          
        Diffa+ and Diffa- has 7 mil spacing 
        Diffb+ and Diffb- has 6 mil spacing 
        Diffc+ and Diffc- has 8 mil spacing 
          
        Diffa(+/-) must have 20 mil spacing to Diffb(+/-) and 
        It must have 26 mil spacing to Diffc(+/-) (for example) 
          
        So in the CM, I can put the 7,6,8 mil spacing for the diff
pairs. 
        But do I still use the net_spacing_type for the 20 and 26 mil
spacing? 
          
        Thanks, Diane

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