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Date: Tue, 23 Jul 2013 19:02:51 +1200
From: Lilith Bryant <dark141 AT gmail DOT com>
Subject: Re: [geda-user] PCB BGA (ball grid array) Package/Footprint
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	Mon Jul 22 16:54:32 2013)
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On 2013-07-22 04:54:32 PM, Dave McGuire wrote:
> On 07/21/2013 03:49 PM, Markus Hitter wrote:
> > Am 19.07.2013 00:33, schrieb Lilith Bryant:
> >> BTW, if you are thinking about generating a pick-and-place (xy) file for
> >> these,  PCB as it stands won't handle it.
> >>
> >> However, if someone would be so kind as to commit the following patch it
> >> will:
> >>
> >> https://bugs.launchpad.net/pcb/+bug/1095516
> >
> > Did that commit, see comment #3 in the above link. Comment #4 shows
> > testsuite failures and as I never used xy files, I have no idea wether
> > this change in behaviour is intended/good/harmless/bad. If a user of
> > this file format could evaluate this it'd help a lot.
> 
>    I've had boards done en masse just recently with xy files generated 
> by unpatched PCB.  I didn't use any BGAs on that board, though.  Is the 
> issue purely BGA-related?
> 
>                -Dave

It's not just BGAs/PGAs,  I fixed the rotations to match IPC-7351 as 
described in the link below.    In particular this affects most 
components on the bottom,  since the rotation is supposed to be treated 
as clockwise on the bottom.

It also fixes QFPs that have pin 1 in the top centre.  (Works ok with pin 1 
on top left too)

It also fixes 2 pin components don't quite have their pins on the same axis..

I have also just had a large run built using an xy file built using this 
fix, and I didn't get queried by my assembler either.   I can only assume 
that they are used to a variety of weird and wacky variations, and can easily 
juggle things until they look right.    e.g: from:

http://blog.screamingcircuits.com/2009/12/a-few-hints-of-the-centroid-
file.html

'We will properly assemble both ways, but this now matched industry 
standard."

Full description of the standard is here:

http://screamingcircuits.typepad.com/files/understanding-the-centroid-file-
r2-1.pdf

Lilith