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Subject: Length equalization
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AhmetOzsoy
Posts: 12
Online: User is Offline
2/11/2008 12:13 AM  
Hi everybody, Is there an easy way of equalizing the length of the selected Clines? e.g You have a 16 bit data bus and you want to equalize the lengths to 2000 mil (pin to pin) Thank you.
Kalevi2
Moderator
Posts: 69
Online: User is Offline
2/11/2008 3:46 AM  
You could try using constraint manager!
Kai Keskinen
shiva
Posts: 57
Online: User is Offline
2/11/2008 3:59 AM  

Hello, Please explain. How can i do it using constraint manager? Or Is there any other way? Hope, someone explain it.

Thanks.
Hpattie
Posts: 33
Online: User is Offline
2/11/2008 3:52 PM  
In the constraint manager, on the relative propagation delay tab, select the nets you want to include in the length matching, and create a match group. In the Pin Delay column, for this group, select longest pin pair. under Relative Delay, Delta:Tolerance, switch from ns to mil. In the Delta:Tolerance box for the nets in your group, type 0:2000. Your group is now set to match within two inches, and a DRC error will be generated for any nets outside this window. Be aware, the tolerance is + or - from the target. Allegro will select one of the nets to be the target, but you can override this by typing target in the Delta:Tolerance column of your selected net. You will then have to set the delta and tolerance for the net selected by Allegro.
Regards,
Harold
Harold Pattie C. I. D.+
shiva
Posts: 57
Online: User is Offline
2/12/2008 12:51 AM  
I didn't find the propagation delay tab. Presentily we are using the PCB editor studio version 16.0. Is it available only in performance version?

Thanks.
Hpattie
Posts: 33
Online: User is Offline
2/14/2008 9:23 AM  
The relative propagation tab is on the left side in the Net folder under Routing.
Regards,
Harold
harold.pattie@ericsson.com
Harold Pattie C. I. D.+
BillZ_EMA
Posts: 51
Online: User is Offline
2/15/2008 5:09 AM  
Hi,
Rules like propagation delay, Diff pairs, match length, area rules are only avalaible in Allegro L w/performance and above.
You will have to manually control the length. Or you will have to upgrade.
Regards,
BillZ
EMA Design Automation
shiva
Posts: 57
Online: User is Offline
2/19/2008 1:08 AM  
Thankyou for all. Especially for AhmetOzsoy for questioned this topic.
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Forums > Silicon-package-board > PCB Design > Length equalization


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