[PCB_FORUM] Re: how do YOU handle component spacing rules?
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Tue, 8 Jun 2004 10:18:29 -0700
Hi Ed,
Personally, I like the idea of DFA checks but my angle is in the third
dimension. I'd like to be able to set up not only the types you've
outlined, but rules for minimum spacing based on package height. Our CM
needs more space between a 200mil high connector and an 0603 cap than
two 0603 caps side by side.
Any thoughts on creating rule sets based on height?
Thanks,
Andrew
-----Original Message-----
From: Ed Hickey [mailto:ehickey@xxxxxxxxxxx]
Sent: Tuesday, June 08, 2004 7:07 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: how do YOU handle component spacing rules?
A new DFA DRC is planned for 15.5. This includes real time
package-package clearance checks derived from a new spreadsheet based
rule set accounting for S-S, E-E and S-E profiles (S = side, E = End).
Each side of the board can have it's own rule set. I hope to demo this
functionality at this year's ICUG in Santa Clara, Sept 13-15.
-----Original Message-----
From: Kevin McCowan [mailto:kmccowan@xxxxxxxxxxxxxx]
Sent: Tuesday, June 08, 2004 9:16 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: how do YOU handle component spacing rules?
Why not just make everything worst case? If you can do it
that way it seems as though everyone would be happy.
It might cause you some distress, but you wouldn't have to
make different parts for different customers and the rules would apply.
It has been they way I have always worked and it hurts a little, sure,
but it solves the problem without a lot of tom-foolery. And while you
are figuring that out, why not alert Cadence that this type of ruleset
would be extremely useful to you. I would certainly welcome rules of
this type added to the already formidable toolset we have. Good luck,
Kevin McCowan SR. PCB Designer TSI Telsys
> -----Original Message-----
> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of Gene Carman
> Sent: Tuesday, June 08, 2004 12:00 AM
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] how do YOU handle component spacing rules?
>
>
> Is there a way to set a component type to component type rule? What I
> = mean is that certain component types tend to have different rules...
> = such as 0402 to 0402 verses 0402 to SOT or BGA.
>
> The only rules I have found are pad to pad... which does not allow for
> = different type rules.
>
> I spoke to some other designers and they offered two solutions: One
> is = to build visual indicators into the parts so you can tell if your
> 0402 = is too close to another 0402 or BGA... great, no DRC there.
> The other = solution is simply use grids and place them... again no
> DRC.
>
> I have different customers that require different spacings. One =
> customer wants 20 mils between 0402 pads, another wants 25. Customer
> 1 = wants 50 mils between BGA and 0402, customer 2 wants 40 mils
> between BGA = and any other comp. =20
>
> With other tools I had the ability to assign components to a component
> = type and then assign rules of type to type. I don't see a way to do
> = that in Allegro (15.1) (very similar to net type rules in Allegro,
> for = component to component spacing)
>
> What do you do?
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