[PCB_FORUM] Re: symbols form libraries and BRD database
- From: Bill Zembek <billz@xxxxxxxxxxx>
- To: "icu-pcb-forum@xxxxxxxxxxxxx" <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Fri, 17 Sep 2010 14:15:04 -0400
Hi,
I have been reading the responses and took the time to do some testing. I can
not confirm the behavior
you have described.
I took a board and placed an IC. Saved the board and copied the footprint to a
new directory (my working directory) and replaced the padstack
and saved it with the same name.
I then read in a new netlist and placed another part with the same footprint
name as the one placed. The part placed was the one copy in the brd database
and not the new one.
This is the behavior I have always seen.
If you can provide a test case demonstrating this behavior you should submit it
to Cadence.
Regards,
Bill Zembek
Technical Support - Allegro Specialist
EMA Design Automation, Inc.
225 Tech Park Drive
Rochester, New York 14623
Phone 585-334-6001 Opt 5
Fax 585-334-6693
www.ema-eda.com<http://www.ema-eda.com>
www.timingdesigner.com<http://www.timingdesigner.com>
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________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of William Billereau
Sent: Wednesday, September 15, 2010 5:03 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] symbols form libraries and BRD database
Hello All.
We have a problem that seems to be appeared in the 16.3 (to be confirmed).
If you start a BRD from another containing some symbols definition, before this
release 16.3, if you added a new component using this symbol definition Allegro
took the definition embedded in the BRD.
If the symbol has been modified on the disk, you had to make a "refresh symbol"
to get the new symbol definition in the BRD file, even for recent placed
components.
Now, if you place a component, it seems that Allegro reads the definition of
the symbol on the disk without using the embedded one.
This means that you got in the BRD old symbol definition for components already
placed in the BRD and new symbol definition for newly placed component.
Then, it is not really a problem within Allegro.
We modified a lot of component applying IPC and LPWizard rules.
One of this rule is the symbol origin.
For a 0805 resistor, in the past, our symbol had the origin on pin one.
Now the origin is the body center of the resistor.
If you apply a refresh symbol, you have to move all previously placed
resistors, nothing critical, just a little bit annoying.
But the main problem is for assembly.
ODB++ output or Fabmaster output contains 2 different kind of 0805 that are
finally the same!
It results in a displacement from the copper for some of them depending on
which definition is taken first:
If the first definition is the body center, then all resistors defined with
origin on pin on have an offset of the half on the right or left, according to
their rotation.
And vice-versa.
Is there a way (User Preferences?) to force Allegro to keep the embedded symbol
definition for all new placed components?
If not, we will have to implement an automatic refresh for all new BRD....
Thanks in advance.
William.
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