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From: "Edward Hennessy (ehennes AT sbcglobal DOT net)" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] Problem with BGA footprint generator
Message-Id: <9B9230E1-E6C0-4A6E-8BC6-F56224D32DCC@sbcglobal.net>
Date: Tue, 9 Jun 2015 13:21:49 -0700
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Reply-To: geda-user AT delorie DOT com

After looking around, I've found two different pin numbering schemes. (Could be more.)

When rotating the package so pin A1 is in the upper left, one scheme uses letters for the rows and numbers for the columns. The other uses numbers for the rows and letters for the columns.

Examining datasheets, Linear uses one scheme, and Xilinx uses another.

I need to update my footprint generator.

Cheers,
Ed

Sent from my iPhone

> On Jun 9, 2015, at 9:11 AM, DJ Delorie <dj AT delorie DOT com> wrote:
> 
> 
> I wonder if BGAs have the transistor problem... that the tool is
> correct for some BGAs and wrong for others, and if we fix it it will
> be correct for some BGAs and wrong for others.