Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 95.57

+0.7%

Nov 28 9:30 AM EST

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To: Bilow who wrote (30744)	9/27/1999 5:06:00 AM
From: John Walliker	Read Replies (2) of 93625

Carl, F) Evidently, according to part (A), the Camino drivers for control lines are working fine. A difference between those drivers and the data bus drivers, is that the data bus drivers have to be able to drive 14 ohms because the data bus is doubly terminated, while the control bus may only have to drive 28 ohms. I haven't bothered to check whether the Rambus Channel requires double termination on the control bus, it may well require it. No, Rambus does not terminate at the controller end. All the signals are driven equally. Such a problem could arise if there was problems with the VRef signals. I have had some difficulty with understanding the VRef specs on DDR, nobody ever seems to specify the input impedance, capacitance, or current requirement of those pins... For Rambus VREF is a DC signal and is decoupled with a capacitor for every pair of chips. John

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