Re: [OT] gEDA: Patches for PCB automake/autoconf system

[Stephen Meier <smeier-at-NOSPAMAlchemyResearch_dot_com>]

Bert,

Greetings!

The standards for naming device packages are through the JEDEC JEP95 
specification. Implementation of land patterns for these device families 
are through documents such as IPC-SM-782A. IPC-7351 does contain 
suggestions for land pattern design and so it will be observed in those 
regards.

EIA-PDP-100  is a catalogue listing of outline drawings illustrating the 
dimensions of supplier registered passive components;

JEDEC-95 as the outlining document for solid state products.

I think that the naming convention should be derived from JEDEC-95 
although an alternative might be to use the Land Pattern Registration 
numbers defined in IPC-SM-782A.

Steve Meier




Timmerman, LJH wrote:

>Hi Steve,
>
>Q: Are we going to conform to the "IPC-7351 Naming convention for
>Landpatterns" ?.
>
>
>To throw in my EUR 0.02 and FWIW, I've started writing a pcb2dxf tool and
>will try to continue with a dxf2pcb, gschem2dxf and/or dxf2gschem tool.
>
>The tools would be command-line driven (just like gnetlist), no fancy GUI
>planned and written in as plain as possible C (GPL'ed).
>
>By means of DXF, g.a.f. would obtain portability to AutoCAD(tm) and/or other
>(mechanical) CAD programs, and g.a.f. would be able to design the mechanical
>aspects of the PCB/PCA as well.
>
>What I intend to end up with (long term goal, as in "I have a dream") is a
>pcb2wrl (VRML-2.0) tool for viewing the PCB with components in 3D view
>and/or geometrically extracted footprints (to check for mechanical
>constraints and WYSIWYG).
>
>I think there are VRML viewers allready out there, so no GUI planned as
>well.
>
>pcb2dxf and a lib with dxf routines are about 30% ready (I have to guess
>here because I have limited time resources, about 6 hours of
>coding/debugging per week, so I will not release anything on the list in the
>near future ... 2004).
>
>Kind regards,
>
>Bert Timmerman.
>
>
>--
>In a world without walls and fences, who would need windows and gates ;-)
>--
>
>
>
>
>
>
>
>-----Original Message-----
>From: Stephen Meier [mailto:smeier@AlchemyResearch.com]
>Sent: donderdag 21 oktober 2004 16:24
>To: geda-dev@seul.org
>Subject: Re: gEDA: Patches for PCB automake/autoconf system
>
>
>This is my intention... to produce a library of land patterns for pcb 
>with matching symbols for gaf and eventually for spice or other simulators.
>
>Steve Meier
>
>
>
>
>Dan McMahill wrote:
>
>  
>
>>However, I'd probably like to just remove that footprint builder
>>unless someone else feels very strongly.  I think the QFP footprints
>>in the ~geda library have been checked out more carefully and
>>thats where I'd rather put the effort in improving the library.
>>
>>Comments anyone?
>> 
>>
>>    
>>
>
>  
>