Re: gEDA-user: Centroid data and BGA footprints

[Dan McMahill <dan@xxxxxxxxxxxx>]

David Kuehling wrote:
> Hi, 
> 
> I'm just wondering, how do I get sensible rotation information in the
> centroid data for footprints that don't have a pin numbered '1', but
> only a pin numbered '1B'.  In my case that's a BGA footprint, where I
> chose pin numbers 1B..7E in accordance to the part's data sheet.
> 
> Do I have to rename the pins (and update the symbol), or can I add a
> kind of rotation hint, or a pseudo-pin #1 to my m4 footprint?

hmm.  Ultimately I think we'll need to modify how pcb stores footprints 
to actually keep track of rotation.  Until then we can probably improve 
whats currently implemented.

The BGA's I've seen use numbers like 'A1' 'A2' ... 'B1' 'B2' ... where 
A1 is the top left and the letters give the row and the numbers give the 
column.  Does anyone know of a controlling standard for BGA's and PGA's 
with regards to how pins are numbered?  Besides that does anyone have a 
wide enough experience with either of these to comment on how they are 
numbered in practice?

David, are you saying your top left pin (when viewed from above with 0 
degrees rotation) is '1B' and there is no '1A'?

Where I'm going with this is I can look for names like '1A' or 'A1' if 
there is no pin numbered 1 but I need a moderately broad view of what 
can be expected.

-Dan


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