Re: gEDA-user: gEDA and PCB ------

[Xtian Xultz <xultz@ig.com.br>]

Em Qui 07 Out 2004 23:30, Stephen Meier escreveu:
> My board is off to the fab house. 15 inches by 8.6 inches some 1050
> parts. I will write a script to count pads latter.
>
> Xilinx Virtex II pro V30.... 896 pin BGA 1 mm pich vias in pads
>
> (4) 100 pin quad flat pack devices.
>
> 8 layer board which really isn't enough.... time to get PCB to have a
> reasonable number of layers... yes yes i know it will be a lot of work.

Wow... I never made a board with more than 2 layers (front and back)...
That is a problem living in a third world country...

> Back anotation is missing so I wrote a program that flips the pins in
> the geda symbols. This is ok if you only have one board and don't mind
> messing with your own symbols but isn't really good for future unified
> libraries.
>
> Hierarchical buses.  Well I have a custom version of gschem and gnetlist
> running. I promise, upon getting this board running, I will fininsh the
> patches that will allow a general release.
>
> My personal library of symbols for gschem and land patterns for pcb is
> getting extensive again I promise a general release soon.
>
> Yes very complex boards can be built with these tools but it isn't easy.
> Next generation BGA will probably require buiried vias, blind vias and
> micro vias. Boards of upto 40 layers have been built by the shop I
> normally use (not designed with geda and pcb).

I just cant image such a board... How thick they are?