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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 88.13+1.0%Nov 21 9:30 AM EST
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To: Bilow who wrote (52654)9/6/2000 8:52:21 AM
From: John Walliker  Read Replies (2) of 93625
 
Carl,

I had a look at the files you linked.

Several interesting points emerged.

1) A long time ago when we were discussing relative power consumption, you insisted that notebook PCs would not need parallel termination to achieve acceptable signal integrity.

It is clear from the data presented by Micron that all current DDR memories need parallel termination, negating most of the power savings you claimed.

2) There are many types of DDR module:

SO-DIMM for notebooks PCs (max 2 modules)

unbuffered DIMM - needs duplicate address drivers and tracks if more than two modules are to be used)

registered DIMM - address needs to be sent in advance and temporarily stored in a register on the DIMM to reduce address bus loading. This inherently increases latency.

FET switched and registered - reduces data bus loading in server applications. This inherently increases latency.

3) Micron claim that PC2100 needs continuing development work and that ASIC design and layout are "very critical".

4) Data from Micron shows that at high data rates the power consumption of PC2100 DDR and PC800 RDRAM are almost identical. I suspect that if the RDRAM was operated at 60 ohms bus impedance (which is allowed for soldered chips not mounted on RIMMs) RDRAM would be considerably better.

John
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