Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 88.13

+1.0%

Nov 21 9:30 AM EST

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To: Bilow who wrote (43933)	6/10/2000 2:59:00 PM
From: John Walliker	Read Replies (1) of 93625

Carl, I don't know what kind of transmission lines DDR-II is going to use, but I am certain that they are going to be a whole lot more robust than the RDRAM garbage. Don't you think it might be better to say nothing than to damage your credibility with statements like this? Of course you know - to some extent - what kind of transmission lines will be used by DDR. They will have stubs leading off the motherboard to all the chips on each memory module. (Unless extra buffering components are used, in which case the stubs will be shorter.) These stubs have a reactive impedance and will cause reflections and ringing. I have one very simple question which I am sure you can answer: Given that a variable number of memory modules may be inserted into the motherboard, how do you terminate the bus to remove the reflections that will occur between those modules, each of which has a reactive impedance? John

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