[PCB_FORUM] Re: Max Neck Length
- From: "Baumstark Michael-EMB043" <M.Baumstark@xxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Thu, 24 Jul 2008 14:21:20 -0400
Hi Gary,
I was just cleaning out some of my icu-pcb threads and noticed your
inquiry on the DRC checking for MAX neck length. To the best of my
knowledge the Maximum Neck Length setting still applies to cline
segments only, and is not cumulative. I have been complaining about
this check for several years now, but cannot provide a SR or PCR number
for you to reference at this time. Please submit your SR if you have not
already done so, and need this checking to apply to the entire net or
Cline, and not just Cline segs.
Since this rule applies to a Net (or indirectly as a member of a
Physical Class constraint), it certainly makes sense to do the DRC audit
on the net or to provide some type of selectable control mechanism (ie.
cumulative checking), or to check less (ie. non-accumulative). DRC
checking to only a single Cline segment makes absolutely no sense to me
at all. (Maybe, it could be minimally acceptable if the neck length rule
applied to a Cline of a net (pin-pin or a pin to via runner).
I am going to reinvestigate this rule in the 16.x tool suite to verify
whether it has been corrected yet. I believe that the 16.2 tool release
is on the road map for later this year. If not fixed in the 16.01 tools
perhaps there is a shot for a 16.2 implementation, unless you truly
believe that this is BUG and not an Allegro enhancement.
Will try to update when I can.
Sincerely yours,
Michael Baumstark
Sr. Staff Electrical Engineer / PCB Design, CID+
Motorola - Advanced Product Technology Center
8000 West Sunrise Blvd. Mail Stop: 8E8
Plantation, FL USA 33322-9947
Intra: http://rprc.mot.com <http://rprc.mot.com/> ;
http://pcbadvisor.mot.com <http://pcbadvisor.mot.com/>
web: http://www.motorola.com <http://www.motorola.com/>
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________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Monday, July 14, 2008 6:02 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Max Neck Length
Hey Dave,
Thanks for the reply.
Oh yeah, I'm on 15.5.1 also, XP Pro.
I think you misread my e-mail. It's max neck length that I'm trying to
use.
It seems to just apply to an individual cline segment, where I need to
set a max neck length for a whole cline.
Gary
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxx
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of David Mattice
Sent: Monday, July 14, 2008 3:26 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Max Neck Length
Version?
I am STILL on 15.51. Max net length works to the specified length on a
cline.
Including multiple cline segments. You are seeing something different?
That would be good to know as that would be a big problem with us
upreving.
dm
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Monday, July 14, 2008 1:57 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Max Neck Length
Hey guys,
Up until now, I haven't had to worry about being even close to a max
neck length spec.
Now I have a max of 500 mils that the neck length can be, and I'm going
to have to use that up.
It looks like the "Max neck length" as specified in a Physical
Constraint Set applies to a cline segment, not the full cline.
If I can only have a max length of 500 mils for the cline (all of the
segments adding up to 500 mils), how can that be set up?
Thanks for any insight into this.
Regards,
Gary
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxx
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