[PCB_FORUM] Re: how do YOU handle component spacing rules?
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Mon, 7 Jun 2004 13:39:06 -0500
All,
What I do is maintain a library set for each customer and then build the
boundaries to match the customer requests. The customer will generally
only have a few oddities and it's easier just to build specific parts.
Regards,
Ron Scott
Texas Instruments
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Gene Carman
Sent: Monday, June 07, 2004 13:30
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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