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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 87.29-3.2%3:59 PM EST
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To: Tenchusatsu who wrote (35070)11/23/1999 8:52:00 PM
From: Dan3  Read Replies (1) of 93625
 
Re: why DDR is being touted as such a panacea....

Ok, I'll bite, what shortcomings? You don't need to go into gory detail, just hit the high points.

As an example, here's a summary of why I don't think it's time for rambus right now:

Here are what I think are rambus's benefits:

High sustained bandwidth.

Interleave (actually, much more than interleave with it's 8 into one mux) on chip instead of on circuit board will eventually be less expensive.

Here are its drawbacks:

128 bits wide on chip permits high data rates, but takes up too much silicon space (bad cost/benefit, density)

400MHZ logic on chip makes it expensive to manufacture

400MHZ is too big a jump right now, and runs into too many speed of light issues, limits total memory size. Why couldn't they have started with 200MHZ 32 bit bus? (like DDR - might have been more manufacturable - could have scaled to 400 in a few years, if necessary)

The latency in the controller is too high - don't know if that's fixable or not - it evidently takes X number of ns to pull together data from 8 (relatively) slow cells and format it into a fast serial stream.

Right now, I think the drawbacks outweigh the benefits, by a fair amount.

What is your ball park summary on DDR? Please modify my rambus comments if you think I'm in error on some of them.

Dan
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