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Subject: 15.5.1:0DRCs, 15.7:860DRCs!
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willbi
Posts: 63
Online: User is Offline
12/05/2006 8:44 AM  
Hello all. I have a board done in 15.5.1 with diff pairs constraints. 0 DRCs with uncoupled length, impedances... I open it on 15.7 and now I got 860DRCs with both uncoupled length and phase tolerance. I checked, all values are the same, DRC mode the same (enabled for what I need...) Any idea (except keep it on 15.5.1, what I'll probably do) to correct this? Thanks in advance.
siriusbliss
Posts: 6
Online: User is Offline
12/12/2006 9:50 AM  
I consider this an annoying bug when updating some 15.5 designs into 15.7.
You might have to wiggle all the traces to get them to flush out the DRC's. This kind of thing happens to me occasionally on even smaller designs.
Either that or rerun DRC???

Greg
agulliver
Posts: 3
Online: User is Offline
12/13/2006 5:55 AM  
We've seen a similar thing when moving between different tool levels within the same release - a DRC free board will acquire many DRCs that could be a matter of just 0.001mm.  Looks like a rounding issue.

One reason we never upgrade in mid-project...

Regards,

Andy G
willbi
Posts: 63
Online: User is Offline
12/13/2006 6:08 AM  
Yes but the problem will remain if you have to modify this old design after upgrading....
It is probably a rounding issue like you suggested.
I occurs without any changes, only a new DRC check.
I found this kind of things really annoying for such a big software like Cadence....

I found today something really nice: ! exclamation symbol is no more allowed in Allegro texts since 15.5.1.
I found on sourcelink, it is not a bug but a kind of "software enhancement".
Some database become corrupted when texts contained !, so to avoid this (instead of looking why it happens), Cadence has just disallowed ! in texts. It's already the only one soft I know that can not handle symbol caracters!... even small other cad soft can do that!
And what about nice toolbar icons on 15.7 (graphic cards and monitors can support better than this today! ;-)..

Only new features/enhancement are acceptable.

Have a nice day.

willbi
agulliver
Posts: 3
Online: User is Offline
12/14/2006 3:34 AM  
[quote]Yes but the problem will remain if you have to modify this old design after upgrading.... [/quote]
True - but that's after the deadline :-)


[quote]It's already the only one soft I know that can not handle symbol caracters!... even small other cad soft can do that! [/quote]
... and transparent colours, and spaces [b]anywhere [/b] in the pathlist etc. etc.

Regards,

Andy G
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Forums > Silicon-package-board > PCB Design > 15.5.1:0DRCs, 15.7:860DRCs!


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