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Subject: Setting up groups
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MURPHYS
Posts: 33
Online: User is Offline
12/07/2007 11:16 AM  
Can someone tell me briefly the steps I need to follow for checking lengths of traces for a group of signals. Every time I think I have it, I don't. Thanks
psj
Posts: 34
Online: User is Offline
12/07/2007 9:53 PM  

I guess we can only measure the length of a single trace segment at a time by selecting the option Display --- Measure and then selecting the two end points of the particular trace...

Regards,
Prajakta.
satya1234
Posts: 0
Online: User is Offline
12/08/2007 7:52 AM  
Why don't you go for propagation delay\Relative propagation delay CM settings. Here you can create groups or classes as you requested.

Regards,
Satya
MURPHYS
Posts: 33
Online: User is Offline
12/10/2007 5:32 AM  
Maybe I wasn't clear. Here is what I am trying to do. I have several groups of about 20-30 nets each that need to be within 5mm and 25 mm of each other with specific trace width and space. I am pretty sure they are all correct since they were done the hard way in Orcad before I translated the board. However, since there were a few hiccups in the translation and I had to redo some connections I would like to double check all of these signals to make sure. I would like to do this via the program and not by querying lengths or a report. Thanks

Sandy
MURPHYS
Posts: 33
Online: User is Offline
12/10/2007 6:23 AM  
Let me clarify. I meant that they need to be within the 5mm or 25mm of each other in length.

Sandy
Hpattie
Posts: 33
Online: User is Offline
12/10/2007 2:28 PM  
Use the constraint manager to create a match group for each group of nets. then assign the relative propagation delay property with the values you need. Be aware that the tolerance field is + or - from the target. Once this property is set, Allegro will generate a DRC error for any nets that are out of tolerance.
Regards,
Harold Pattie C. I. D.+
BillZ_EMA
Posts: 51
Online: User is Offline
12/11/2007 6:05 AM  
Hi Sandy
The easiest way I know to do it is in Specctra. Take your board into the router.
Route>route editor
Un protect all of the nets.
Then select the nets you want the report on and do a report>specify>selected.
You can even create a do file to do all of this.

Or inside of pcb editor do a tools>report>etch legth by net (report and save it to t text file)
Then import the text file into a spreadsheet.

Regards
BillZ
EMA Design Automation
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Forums > Silicon-package-board > PCB Design > Setting up groups


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