[PCB_FORUM] Re: DRC
- From: William Billereau <William.Billereau@xxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Mon, 2 Jun 2008 23:04:26 +0200
With cam350 V9.51.
We have 2 licenses of this tool here.
All our boards are treated with it.
As RS274X was not (we use Allegro since 1995 and version 95a or 97a) convenient
to use (and maybe still not convenient to use), we create our films in RS274,
then we convert then to RS274x with this tool.
Useful to generate PDF files with each film and now we also check the IPC
netlist. Works great (when we do not forget to run it ;-)
Export Gerber netlist, import IPC356A netlist (extracted directly from Allegro)
and then compare them
Quite long to proceed with large boards.
It detects things like (for example) antipad definition missing (only warnings
in Allegro but this will put shorts on power planes)
William.
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Jean-Charles TEYSSIER
Sent: lundi 2 juin 2008 19:51
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: DRC
William,
how do you compare Gerber and IPC netlist?
On sourclink i found only mention of gerbtool which is part of orcad
suite, not allegro.
Jean-Charles
William Billereau a écrit :
> Neither after DRC update, nor dbdoctor including shapes checks...
> The only way to correct this was to move the cline and then the shape was
> updated.
> But the problem was that I do not know that I have to slide the cline!
>
> I had to write a skill routine to detect it.
> (the Gerber/IPC netlist comparison detects it but unfortunately I forgot to
> run it!)
>
> I was thinking that Cadence was knowing the problem but the solution number
> 11328776 is not exactly the same problem.
> It is also a "shape status falsely reported as up to date" but in my case it
> is also a "DRC status falsely reported as up to date"
> The "fill mode" was set to "Disabled", no "Out of date" shape was reported
> and DRC were up to date!
>
> William.
>
>
> Sourcelink:
> Dynamic shape status falsely reported as up to date.
>
> Error Message:
> None
>
> Problem statement:
> I have an instance in which I have a dynamic shape define on a subclass of
> type
> plane with the negative artwork check box selected. When I change the
> subclass to conductor
> I can visually see that the dynamic shape has not dynamically cleared the
> component
> pins, but the Setup > Drawing Option > Out of date shape reports 0 shapes out
> of date. The Shapes (Dynamic Copper Pour) section of the Drawing option shows
> the
> Fill mode to be Smooth and the Update to Smooth button is grayed out.
> Toggling the
> radio button from smooth to disable to smooth does not enable the Update to
> smooth
> button.
>
> Solution:
> This issue has been reported in Master PCR 4020116 and is planned to be
> addressed in
> the 16.0 release, which is tentatively scheduled for release near the middle
> of 2007.
>
> Workaround:
> Select the dynamic shape and move it ix 0.
>
> 1. Select Edit > Move.
> Adjust the Find filter tab so that only "Shapes" are selectable.
>
> 2. Select the dynamic shape.
>
> 3. On the Allegro PCB Editor command line enter:
> ix 0
>
>
>
>
>> -----Original Message-----
>> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-
>> bounce@xxxxxxxxxxxxx] On Behalf Of Jean-Charles TEYSSIER
>> Sent: 02 June, 2008 6:54 PM
>> To: icu-pcb-forum@xxxxxxxxxxxxx
>> Subject: [PCB_FORUM] Re: DRC
>>
>> Everyting green AFTER a dbdoctor? (i do not look at green ligths, only
>> the summarry drawing generated with report after a dbdoctror; i am old
>> fashion...)
>> Wao! Great Bug...
>>
>> JCharles
>>
>> William Billereau a écrit :
>>
>>> I think that we could spend a lot of time to list all dangerous
>>>
>> Cadence behaviors.
>>
>>> I had to implement some controls to avoid really dangerous things.
>>> The last one:
>>> A positive shape connecting 5 powers and a net and Allegro status
>>>
>> still returns everything "green" .... even in 16.01!
>>
>>> And even after DRC update.
>>> No problem: only 25 boards to repair (we succeeded.. if not, 20
>>>
>> boards to the wastebasket!)
>>
>>> And a customer who wants to kill us ;-)
>>>
>>> Allegro absolutely needs to be checked with IPC netlist comparison!!
>>>
>>> The problem is known at Cadence.... a fix is coming! ;-)
>>>
>>> William.
>>>
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-
>>>> bounce@xxxxxxxxxxxxx] On Behalf Of Jean-Charles TEYSSIER
>>>> Sent: 02 June, 2008 6:29 PM
>>>> To: icu-pcb-forum@xxxxxxxxxxxxx
>>>> Subject: [PCB_FORUM] Re: DRC
>>>>
>>>> Yes, old bugs reappears some times (specially on shapes... and
>>>> gerbers(import))
>>>> looks like someone ask for a different behavior for a command,
>>>>
>> cadence
>>
>>>> does it and brake something related (recent fillet's problems is an
>>>> exemple)
>>>> I have found an other thing very dangerous:
>>>> 15.7, not yet in 16.x.
>>>> If you describe a spacing via2someting_else to a value (say 1mm) but
>>>> test via to 0.5mm (why not?), then test via value take precedence on
>>>> the
>>>> greater value.
>>>> This is how allegro works and hotline say it should not be
>>>> corrected....
>>>>
>>>> Jean-Charles
>>>>
>>>> William Billereau a écrit :
>>>>
>>>>
>>>>> Hello again.
>>>>>
>>>>> If it can help someone we found something interesting here:
>>>>>
>>>>> We have 2 big boards (really big) with a lot of electrical
>>>>>
>>>>>
>>>> constraints
>>>>
>>>>
>>>>> and special shapes (one is called horse shoe ;-)
>>>>>
>>>>> When we want to update DRCs, the system runs with 50% of processor,
>>>>> and then crashes or terminates without updating DRCs or saying that
>>>>> system is out of memory ....
>>>>>
>>>>> We send the biggest one to Cadence.
>>>>>
>>>>> They replied that it took less than 5 minutes to update and
>>>>>
>>>>>
>>>> everything
>>>>
>>>>
>>>>> is OK.
>>>>>
>>>>> We tried to do it in another service, it runs, less than few
>>>>>
>>>>>
>>>> minutes..
>>>>
>>>>
>>>>> We suspected that the setup was wrong... I tried to find, removing
>>>>> SKILL, variable environment, ... It works when I remove a
>>>>>
>> environment
>>
>>>>> variable with PATH with some setup...
>>>>>
>>>>> I found that if I remove our env file, it works but I cannot find
>>>>> where exactly.
>>>>>
>>>>> I have a look to Sourcelink and found a solution given for 15.2
>>>>>
>> with
>>
>>>> a
>>>>
>>>>
>>>>> PCR for 15.5.
>>>>>
>>>>> So it cannot be this because we are in 15.7, test were done in
>>>>>
>> 16.01.
>>
>>>>> The PCR should be present in these releases.
>>>>>
>>>>> I try nevertheless: I removed the use_accurate_delay_calculation.
>>>>>
>>>>> And ... it works!
>>>>>
>>>>> (never mind: we successfully asked for a more powerful computer! ;-
>>>>>
>> )
>>
>>>>> Some bugs seem to reappear at Cadence...
>>>>>
>>>>> Sourcelink said:
>>>>>
>>>>> *Update DRC & Database Check run until system is out of memory*
>>>>>
>>>>> *Error Message:*
>>>>>
>>>>> Memory Error...
>>>>>
>>>>> *Problem statement:*
>>>>>
>>>>> When I run update *drc* or database check with *drc* enabled, the
>>>>> *process* runs and runs
>>>>>
>>>>> until I get a memory error. What can I do to fix this?
>>>>>
>>>>> *Solution:*
>>>>>
>>>>> In this case, the problem was cause by the variable
>>>>> use_accurate_delay_calculation
>>>>>
>>>>> being enabled. This has been reported in PCR 799814 and fixed in
>>>>>
>> the
>>
>>>>> 15.5 release.
>>>>>
>>>>> Workaround:
>>>>>
>>>>> 1) Disable use_accurate_delay_calculation from Setup > User
>>>>>
>>>>>
>>>> Preferences >
>>>>
>>>>
>>>>> Signal_analysis and then run Update *DRC* or database check.
>>>>>
>>>>> */William Billereau/*/
>>>>> CERN group TS / DEM
>>>>> 1211 Genève 23 Suisse///
>>>>>
>>>>>
>>>>>
>>>>> /
>>>>> Tel: (+4122) 76 73403// //
>>>>> mail to: william.billereau@xxxxxxx
>>>>>
>>>>>
>>>> <mailto:william.billereau@xxxxxxx>///
>>>>
>>>> -----------------------------------------------------------
>>>> To subscribe/unsubscribe:
>>>> Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
>>>> with a subject of subscribe or unsubscribe
>>>>
>>>> To view the archives of this list go to
>>>> //www.freelists.org/archives/icu-pcb-forum/
>>>>
>>>> Problems or Questions:
>>>> Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
>>>> -----------------------------------------------------------
>>>>
>>>>
>>> -----------------------------------------------------------
>>> To subscribe/unsubscribe:
>>> Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
>>> with a subject of subscribe or unsubscribe
>>>
>>> To view the archives of this list go to
>>>
>> //www.freelists.org/archives/icu-pcb-forum/
>>
>>> Problems or Questions:
>>> Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
>>> -----------------------------------------------------------
>>>
>>>
>>>
>> -----------------------------------------------------------
>> To subscribe/unsubscribe:
>> Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
>> with a subject of subscribe or unsubscribe
>>
>> To view the archives of this list go to
>> //www.freelists.org/archives/icu-pcb-forum/
>>
>> Problems or Questions:
>> Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
>> -----------------------------------------------------------
>>
> -----------------------------------------------------------
> To subscribe/unsubscribe:
> Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
> with a subject of subscribe or unsubscribe
>
> To view the archives of this list go to
> //www.freelists.org/archives/icu-pcb-forum/
>
> Problems or Questions:
> Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> -----------------------------------------------------------
>
>
-----------------------------------------------------------
To subscribe/unsubscribe:
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe
To view the archives of this list go to
//www.freelists.org/archives/icu-pcb-forum/
Problems or Questions:
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
-----------------------------------------------------------
-----------------------------------------------------------
To subscribe/unsubscribe:
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe
To view the archives of this list go to
//www.freelists.org/archives/icu-pcb-forum/
Problems or Questions:
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
-----------------------------------------------------------
Other related posts:
