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Technology Stocks : Intel Corporation (INTC)
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To: John Walliker who wrote (115214)10/30/2000 1:09:19 PM
From: Ali Chen  Read Replies (2) of 186894
 
<Are you seriously suggesting that Intel did not realise that Rambus uses transmission line techniques?>

Judging from early Rambus publications and
patent applications, I am seriously suggesting
that Rambus had no clue about what they were
dealing with. I believe that the only touch with
reality was provided by real hardware guys
from Intel, HP and Tektronix.

Early waveforms
paublished by Rambus clearly show that the combined
probe and oscilloscope bandwidth was severely
inadequate to observe intricacies of real signals,
which may totally clogg the reality and mislead
design engineers.

Also, all original Rambus proposals
were around 250MHz clock/500MHz data rate, with
multiplexed address and data lines. Apparently
this "solution" did not cope well with reality too,
since later the bus was changed to separate commands
and data.

More, I also believe that the 800MHz specs were
introduced because of competitive pressure from
SDRAM technique, which created the whole new layer
of problems with signal integrity fro Rambus.

It took 10 years of Intel help for Rambus to arrive
that transmission lines are all about impedance
inhomogenieties, where every vias may be eventually
a problem. So much for a robust and stable digital
solution for mass produced products.

BTW, is there a Rambus research center in England,
or what? Just curious...
- Ali
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