Not a chance. I am using 99SE and have done simple, circuit wise,
boards in the past but I didn't trust it to do partial routing. There
is also lots of analog present. I made a probe card last year for a
452, or so, pin BGA with 3mil/3mil track/spacing and used the
autorouter. It was a 5 sided board with a 96 pin connector at each
side, therefore it had an odd shape. The autorouter did pretty well. I
had to reroute about 40 tracks and there were a ton of vias. I decided
to take the time with my current board since I will have to make changes
later and an autorouted board makes that difficult unless one reroutes
the board.
Cheers,
Tom
Tom Robinson wrote:
Hi Tom:
Did you autoroute this board?
tr :)
-----Original Message-----
From: Tom Reineking [mailto:[EMAIL PROTECTED]
Sent: Monday, July 26, 2004 1:48 PM
To: Protel EDA Forum
Subject: Re: [PEDA] first BGA layout
Ralph,
This is just an aside and not an explanation to your problem. I laid
out a board with 3 BGAs are 0.75 mm and one 256 pin BGA at 1 mm
spacing. Using .004" tracks with .004" spacing I was able to route the
whole board on two signal layers with two power layers and no special
vias, meaning all were through hole, .018" pad .010" hole. It did take
some time and careful planing but at a huge PCB cost savings. Any time
you go over 4 layers and start using fancy vias the cost accelerates
geometrically. I your case that may not be an issue but in mine I had
no choice. Don't forget to use gold flash for the BGAs (for the whole
board is easier) to reduce manufacturing problems with soldering BGAs.
Cheers,
Tom
Ralph Effinger wrote:
I am haveing trouble laying put an 8 layer board. I have a schematic,
board with chips, resistor,caps and one 256 bga. The bga has a 1mm
pitch. I have setup the layer stack mang. and the desing rules the best
I know how,{this is my first bga}. I layed out the board using blind or
buried vias. I am using protell 99se. after auto routing the board, the
vias all go from the top layer to the bottom not useing any blind or
buried vias. I,ve looked at the tutorials and book, and can find
nothing to help me. thank you!
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