Manipulating pin pairs/Pin Pair reports
Chris Sadlers
When creating t-junction routing. I want to query the length of the pin pair
from
A to B and A to C.
When I select pin pairs I can query A to B but when I try to query A to C it
either selects the whole net or the wrong pin pair. Is there a way to
manipulate these pin pairs to get the proper results or do I have to put a
dummy component at the t-junction to get the results I want.
I even tried connecting the ratsnest the way I want but after routing I get
the same result.
Any thoughts.
Thanks
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David Ricketts
one the size of the via, since the branch is always at a via.
You will need to protect the net topology to preserve the pin-pair order,
and they won't always be as you need them. If they're not, in Layout, that
is easiest to organize by moving the unrouted parts around until the right
topology of the connections (ratsnest) is displayed, then protecting the net
topology. If your placement is already fixed and partially routed, then you
can use the command in Router, "reschedule nets". It only works on
connections.
David Ricketts
PCB Design Services
MMI Designs
John Matthews
In select mode, set your filter to Traces only.
Select the first trace segment at A (Probably inside a pad), then got to B and Shift select the end of the net (the last segment, also probably inside a pad).
Use the QL hot command. Save with the signal name or add the signal name inside the notepad file (so you'll know which signal it is).
Unselect everything (click somewhere or hit ESC).
Select the first trace segment at A (Probably inside a pad), then got to C and Shift select the end of the net (the last segment, also probably inside a pad).
Use the QL hot command. Save with the signal name or add the signal name inside the notepad file (so you'll know which signal it is).
Adjust traces and repeat as necessary.
JM
Chris Sadlers wrote:
Looking to query pin pair length. When creating t-junction routing. I want to query the length of the pin pair from A to B and A to C. When I select pin pairs I can query A to B but when I try to query A to C it either selects the whole net or the wrong pin pair. Is there a way to manipulate these pin pairs to get the proper results or do I have to put a dummy component at the t-junction to get the results I want. I even tried connecting the ratsnest the way I want but after routing I get the same result. Any thoughts. Thanks -END- SupportNet: http://www.mentor.com/supportnet To unsubscribe send a blank email to: leave-ta...@listserver.pads.com For assistance please send mail to talkli...@mentor.com
-- John Matthews Silicon Hills Design 8504 Cross Park Drive Austin, Texas 78754 512.836.1088 x1108
Chris Sadlers
Thanks.. I was able to do what I wanted by moving the component in order to
get the topology correct as suggested. Then I protected the topology. I
didn't need to put the dummy junction points in. I can route from point A to
a via(junction point) then continue to point B.. Since the topology is
locked you cannot rout from the via(junction) to C but you can route from C
back to the junction (not sure I understand why.. but it works). The pin
pairs are maintained and now I can select them and get the proper pin pair
length.. Yeah !! Now.. Does anybody have a script that will extract the pin
pair lengths so I don't have to manually select and write them down... Im
lazy !!
Thanks again !!
Chris
-----Original Message-----
From: David Ricketts [mailto:ta...@listserver.pads.com]
Sent: Wednesday, April 15, 2009 5:20 PM
To: Talk Mailing List
Subject: RE: Manipulating pin pairs/Pin Pair reports
By definition, pin-pairs are pin to pin. You will need a dummy part. I use
one the size of the via, since the branch is always at a via.
You will need to protect the net topology to preserve the pin-pair order,
and they won't always be as you need them. If they're not, in Layout, that
is easiest to organize by moving the unrouted parts around until the right
topology of the connections (ratsnest) is displayed, then protecting the net
topology. If your placement is already fixed and partially routed, then you
can use the command in Router, "reschedule nets". It only works on
connections.
David Ricketts
PCB Design Services
MMI Designs
-----Original Message-----
From: Chris Sadlers [mailto:ta...@listserver.pads.com]
Sent: Wednesday, April 15, 2009 1:43 PM
To: Talk Mailing List
Subject: Manipulating pin pairs/Pin Pair reports
David Ricketts
all information you need.
This is how mine is set up. In Router Spreadsheet, select "Pin pair" in the
right drop down box. Click on the "Create new scheme" button. I named mine
"PinPair Output." Click on the "Organize columns" button, and change the
Displayed columns window to Name, Routed length, and Net. Then in the
display, sort by Net. Since I use a more complex t-routing scheme with a
via-part, terminators, and clock length tuning, I copy this info into Excel
and use slightly more complicated formulas than PADS supports.
In your case, you don't need to use Excel, so you can add other length
matching columns to help sort the information.
A small warning about your routing. Layout will allow you to route to the
via as you described, but Router won't. I think this has to do with how well
they adhere to the design rule prevention mode. It will not affect the
actual pin pair length measurements, so there is no need to worry. But if
you choose to do any editing in Router, and I do recommend that as it is a
superior routing tool, this could cause some odd and frustrating behavior
where the via is concerned.
Chris Sadlers
Good info on the spreadsheet. I am doing my routing in the router(PADS
Router 2007.1) not layout and Im able to route from the pad to the via but
not the other way around which is working well for me.... Got me !!
Thanks again
David Ricketts
You're welcome.