Rambus (RMBS) - Eagle or Penguin Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 90.19

+2.8%

Nov 19 3:59 PM EST

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: Ali Chen who wrote (43972)	6/10/2000 6:20:00 PM
From: John Walliker	Read Replies (2) of 93625

Ali, You probably are not aware that to make a bus bi-directional, the point of connection must have both receiver and transmitter attached, and be enabled in alternative manner. It is hardly possible to provide the same impedance for active and inactive transmitter, therefore the bi-directional busses have inherent impedance mismatch at every connection point. The impedance also changes dynamically as the device transmits or receives data. It again introduces inhomogenuities and hence the unpredictable reflections. I think you may have missed the whole point of the Rambus interface. It does maintain an essentially constant (high) impedance regardless of whether the device is transmitting or receiving. That is one reason why it uses constant current bus drivers. (The other one is that multiple clock domains can then coexist on the bus.) However, what you wrote perfectly sums up the problems which DDR faces. John

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next