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

To: TigerPaw who wrote (33624)	11/2/1999 11:45:00 PM
From: Tony Viola	Read Replies (2) \| Respond to of 93625

Tigerpaw, double termination In a presentation I saw by Rambus, the unterminated line was one of the features that increased it's speed. They actually use the reflected signal to boost the gain at the detection sensor Sounds to me to be bordering on black magic, sorcery and voodoo. How do they know that the "desirable" reflected signal is not reflected noise due to a mismatch. Dangerous technique, if true. Sorry to inject FUD, but I would really like to see a Rambus engineering article on this one. Tony

To: TigerPaw who wrote (33624)	11/3/1999 5:05:00 AM
From: John Walliker	Respond to of 93625

TigerPaw, In a presentation I saw by Rambus, the unterminated line was one of the features that increased it's speed. They actually use the reflected signal to boost the gain at the detection sensor (it is timed by the length of the trace to reflect upon itself just at the right spot). The main way they increase speed is by reducing the actual current that has to be charged into the lines and then drained away to ground before the next cycle can begin. Double termination would eliminate this advantage. No, I don't think you are right about that because the Rambus drivers DO have the capability to drive a doubly terminated line at full speed. This is quite clear from the specifications. What they do achieve is a substantial reduction in power consumption. The signal boost by reflection does not depend on any trace length because the receiver in the RAC is at the end of the trace and hence by definition is at the point of reflection. These issues are difficult to convey accurately in a presentation, so I am not surprised that there might be confusion. John