Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 87.20

-3.3%

3:59 PM EST

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To: jim kelley who wrote (43879)	6/10/2000 2:24:00 AM
From: Ali Chen	Read Replies (1) of 93625

<Also, it is clear that many of the criticisms of RDRAM RSL bus lodged by Carl apply also to DDR-II, i.e., Carl does not like the transmission line bus that RAMBUS uses. However, DDR-II will have the same problem of a very high clock rate together with a large number of data traces. DDR-II will require transmission line designed busses similar to RDRAM.> The observation that any high-frequency connection would require a proper design is a very smart observation for a person like you. However, at least two major things have escaped your attention. The first fallacy is that you think that "busses" are "similar to RDRAM". They are not. The DDR will not hook up 32 spatially distributed pins to the same bus wire as the ram-bs does. Driving a waveguide at 30+ points with inherently stochastic signals as all PC data are was the stupidest idea I ever heard of. Even in old time of thick Ethernet coax cabling, real engineers knew that there are always standing waves, so the cable was marked at proper intervals where the hookup should be done. I seems that Rambs engineers are somewhat ignorant in the field, and the RIMM specifications are plain dumb with this regard. Second, you forgot that the DDR data frequency is about 3 times lower than that on Rambs. Even assuming the linear scale of difficulties in signal integrity associated with ultra-high frequencies, it does make some relief in manufacturing tolerances... Sorry jim, you probably will never recover your investments in Ram-bs. Face it.

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