Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 113.89

-6.4%

Jan 30 3:59 PM EST

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To: Jdaasoc who wrote (38722)	3/22/2000 5:34:00 PM
From: Dave B	Read Replies (2) of 93625

John, We'll get Tench's answer as gospel, but I'm pretty sure that Rambus specifically does not share data and control signals on any pins. Instead, they packetize the control signals onto I believe a 5-bit wide bus which after 8 clock transitions provides a 40 bit control "word" (for lack of a better term). One of the reasons RDRAM works better than DDR is that the control and data signals travel at the same speed (both using a 400Mhz clock). DDR sends the signals at different speeds and I'm sure John W. or Tench can explain better than I why that's a bad thing (crosstalk?). But I'm pretty sure they don't MUX the signals. In fact, now that I think about it, I'm positive they don't because with RDRAM you can sustain the data stream at an almost constant flow (since while the data is flowing you can be sending additional commands on the command bus). If you combined the signals, the data would have to wait fairly often for a command to be sent. That's partly why RDRAM gets something like 95% efficiency versus the 65% to 70% in sustained data transfer that SDRAM and DDR get. I may have these numbers slightly wrong but I'm sure the concept is correct. Dave

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