Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 90.19

+2.8%

Nov 19 3:59 PM EST

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To: kash johal who wrote (29432)	9/13/1999 9:56:00 PM
From: Alan Bell	Read Replies (6) of 93625

re: Perhaps if you don't believe me are there any EE's who are long RMBS who can convince John Can't convince him he is wrong if he isn't! The signaling logic that DDR uses, SSTL-2, does not need terminators to work electrically if the rise/fall times of the signals are slow enough. But any unterminated signal line will have reflections which cause ringing in the signal. The magnitude of the ringing is related to the rise/fall time of the signal and the length of the trace. The classic "conditions for short transmission line" are Length << (1/6) * (Trise/sqrt(LC) For a signal with a rise time of 2ns, the maximum acceptable length would be 2.3 inches. So a system could be left unterminated if the data signals are less than 2.3 inches. But if they are longer than this, termination is required. This will then use the kind of power that John describes.

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