Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 96.64

+2.6%

12:24 PM EST

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To: Ali Chen who wrote (65371)	2/5/2001 1:57:34 PM
From: Ian Anderson	Read Replies (1) of 93625

Ali, You don't know what you are talking about! A RIMM does not have any 'Y' connections. The tracks run directly from driver to terminator, with the pins on the RDRAM presenting small lumped capacitances evenly distributed along the transmission line. This approximates very closely to a transmission line with a slightly lower characteristic impedance. The tracks are designed with a slightly higher than desired impedance, so that when the RAMBUS chips are present the desired impedance is achieved. I know this works because I designed just such a system in 1989 using fast SRAM. The only undesirable effect is that the propagation speed reduces slightly. In my design with 1.5pF per memory chip pin, this was around 90% of the expected speed. Relative to the speed of the memory core, this is not significant. FUD off somewhere else, and stop spreading disinformation here. Ian

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