I've made LFBGA PCB parts in protel 98 SE and I'm rather concerned or is that befuddled? hmmmm in any case what I have done I've been experimenting with a 4 layer board and the (miserable) autorouter that came with it. I've made the layer type of the pads multilayer so that each layer of the board can connect to a pin. Right so what's the problem?
Well there are several options for the solder mask and yet I can't see where to specify them in the package information. IE in the LFBGA144 package I should be able to specify a solder mask defined pad with a solder mask hole of 0.38mm and a pad size of 0.48 mm. I also should be able to specify a non solder mask defined pad with solder mask hole of 0.50mm and a solder pad of 0.35mm. Next comes .. what trace width should I use. Currently (rightly or wrongly) I'm attempting to use 0.125mm trace widths for connecting to the pads. Too large? Too small? I have been setting that as the smallest but I'm thinking that is not as wise as I had thought before. Is it possible to associate a set of rules WITH a package? IE LFBGA package automatically defines the rules for the nets that connect too it. Hints pointers appreciated. I would like to have the design rules twisted.. err pushed toward sane directions before the autorouter goes insane err begins it's job. In summary, how do I define the solder masked used with a specific package, what is a proper trace width too use with 0.8 mm pitch BGA packages, and is it possible to semi automate setting the design rules based on package used with a net? Stephen Stephen R. Phillips was here Please be advised what was said may be absolutely wrong, and hereby this disclaimer follows. I reserve the right to be wrong and admit it in front of the entire world. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
