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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 96.40+5.4%Dec 19 9:30 AM EST
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To: sylvester80 who wrote (55478)9/27/2000 3:24:28 PM
From: Bilow  Read Replies (1) of 93625
 
Hi sylvester80; The reason why dual RSL channels in a single RIMM aren't being done:

(1) It would require an increase in the number of motherboard layers. You have to look at the artwork on a current i820 motherboard to appreciate this effect - two layers are completely used routing to and from the RIMM module.
(2) It increases the pincount of the RIMM by quite a large amount. You have to remember that the full RSL bus (and you would have to have separate RSL buses for the two channels for electrical timing reasons) has to hit the module pins twice, once to get on, and once to get off. [This is largely why RIMMs have as many pins as DDR DIMMs, even though RDRAM has fewer data pins in the channel.]
(3) Because of the wider bus, it would be even harder to match RSL channel wire lengths than it already is. Most of the space to route RSL channels around is not spent in straight wires carrying signals. Instead, most of the space is spent in either ground traces, intestine like loopings to match signal lengths, or in tabs and vias to match electrical trace properties.

The heat issues that Scumbria is talking about would not apply to a x2 RSL channel. I think he is just teasing you about the x8 RSL version.

-- Carl
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