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Technology Stocks : Rambus (RMBS) - Eagle or Penguin -- Ignore unavailable to you. Want to Upgrade?

To: Bilow who wrote (79761)	11/13/2001 6:49:37 PM
From: John Walliker	Read Replies (1) \| Respond to of 93625

Carl, I agree with you in this case. The RDRAM bus depends on the reflection of read signals at the memory controller to double the amplitude. However, once the wavefront has moved away from the controller it could be described as noise simply because no other device will detect it (assuming that everything works as intended). There are of course many other, much smaller, reflections that are effectively noise. The full-amplitude reflection at the controller is fundamental to the operation of the bus in its present form, and to the power saving achieved from the use of single-ended termination. This can only be done because the output drivers on all the memory chips have a high output impedance and are able to drive approximately the same current onto the bus regardless of the bus voltage. It is true that signals propagate along a microstrip line (which is what Rambus uses) at about half the speed of light in a vacuum (or air). John