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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