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Hey guys, my first post and it is a long one. Let's see if I can explain me correctly.We are having problems with the Back annotation process between Allegro 15.2 and Capture 10.2. The process works something like this:- We update our schematic and generate a netlist- Send this netlist to our PCB Engineer, so he can update his PCB file.- He then updates/changes nets with new rules, constrains, propagation delay values, etc. then sends us the updated board file back for syncing- Once we receive the file, we do the back annotation process in Capture (Tools-Back Annotate-Allegro) to keep the entire design in-sync- After going through the automated process, the SWP file generated is "blank" (file size ~1k)- We check if the databases are synced manually, and they do seem to be in order. What puzzles us is the fact that certain properties do not appear in the SchematicAny comments? Solutions perhaps?
Well I don't know where to start here but I'll hit the first thing in
that allegro 15.2 goes with capture 10.2 and 10.3, As Allegro
15.5 and 15.5.1 go with Capture 10.5 It appears you are trying to mix
the releases not sure this has anything to do with the problem but its
definitely not the recommended procedure. I have had these problems
backannotating before and I always keep the release strams from Cadence
in tact. What I have seen cause these problems in the past are the
1) Schematic design name has been changed since the netlist has been read in to allegro
2) The schematic had electrical rules like rel prop delay in it and
came from an earlier capture release such as 9.2.3 where there
was no rule syntax checking and the syntax was bad therefore capture in
its infinite wisdom blanks out the rule and passes that blank to
3) Constraint Manager was used in allegro to add delete or change rules.
I use CM all the time, to me it is unacceptable not
to be able to use it. You can go and edit the properties through the
property editor but it is much easier and faster in CM, and furthurmore
there are properties which you can not add now to nets in the property
editor now in REL 15.2 and beyond such as RELATIVE_PROP_DELAY.
The solution here is for us user to continue to beat on Cadence to add
the CM to ORCAD as their position on not supporting CM through ORCAD is
ludicrous based on what I just mentioned above, and obviously the
complete flow with exchanging rules is broken with out it. I have
opened numerous SR's on problems revloving around this central issue,
and have gotten work arounds but hvae not been succesful in getting
Cadence to recognize that there is a need for CM support on ORCAD. The
way I have been succesful in transferring rules enter or changed
through CM back to ORCAD is to delete all the net properties in the
ORCAD schematic. then run the back annotation. You still need to be
careful with this as CM supports things that ORCAD doesn't such as the
RELATIVE_PROP_DELAY in CM supports multiple match groups ORCAD only has
support for one.
If you have changed the name on the schematic it is
definitely you problem. Here is an excerpt of an email frm cadence
support from an SR iI had on a similar problem. Read below:
This issue has been
fixed in our next release 15.7 which is due to be released in July this
A Message is displayed
at the time of Back-Annotation if the design name is changed after creating the
I hope this
Carl [mailto:firstname.lastname@example.org] Sent: Tuesday, June 13, 2006 8:17
PMTo: Prabhjot KaurSubject: RE: Back Annotation creates
[mailto:email@example.com] Sent: Tuesday, June 13, 2006 8:45
CarlSubject: RE: Back
Annotation creates DRC's
your feedback, I have filed a PCR to address the issue of back annotation
failing when design name changes.
addressing the change is 905469 (Title: 'user warned when Design name changes
Carl [mailto:firstname.lastname@example.org] Sent: Thursday, June 08, 2006 8:29
PMTo: Prabhjot KaurSubject: RE: Back Annotation creates
only thing that is disturbing is the lack of error checking / prevention of bad
data getting into allegro through the import logic. I think this should be
better handled by allegro. As the bad rule set cam in some time ago when we were
on 10.3 and rules were getting broken when upreving from 10.2 and below !0.3 was
a bda release 10.5 seems to be much more robust! I would also like to see
Cadence make an effort in having tools for the ORCAD allegro flow to manage the
annotation backannotation processes and the design reuse processes. A good
example of the lack of it is here
Allegro - OrCAD Reuse module Procedure
But you can close this ISR I guess all I’m
try to say is its all too easy too shoot yourself in the foot with the