Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 94.82

+2.7%

3:59 PM EST

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To: blake_paterson who wrote (41353)	5/4/2000 5:42:00 PM
From: Bilow	Read Replies (2) of 93625

Hi blake paterson; Re: Currently all of the videocards that are successfully using DDR are using 12 Layer boards. While I don't have evidence to the contrary directly in front of me, I believe that this statement is silly in the extreme. The layer count on this kind of board is dominated by what are called "escape" requirements. Basically, a given package will require a certain number of layers to get signals out from under the most dense (in terms of pins) chip, in this case the controller chip. In addition to the package, the number of layers is dependent on the drill size, whether blind vias are allowed, and the trace/space specification for the copper board. But in any case, 12 layers is a silly exaggeration, and would be believed only by mom and pop. Certainly not by anyone with much experience with modern PCB practice. If anyone doubts this, I suggest that they take a look at the IBM specifications for escape paths on their ASICs. -- Carl

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