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Technology Stocks : Rambus (RMBS) - Eagle or Penguin -- Ignore unavailable to you. Want to Upgrade?


To: kash johal who wrote (29432)9/13/1999 12:17:00 PM
From: Matrix_Man  Read Replies (1) | Respond to of 93625
 
Anyone wondering about how the short position is these days? I am. Last Friday was the reporting day for brokerages. The dissemination date is 9/24. Very close to Rambus Christmas, isn't it. Really has me wondering. My bet this time is that the short position is lower, but of course I am only guessing. And long term it really doesn't matter. However, if we are still carrying our 5 million short, we could start seeing a nice rise any day now going into the Dell release as they begin covering.



To: kash johal who wrote (29432)9/13/1999 9:41:00 PM
From: Tenchusatsu  Read Replies (1) | Respond to of 93625
 
Kash, <Calling Tench / Scumbria.>

Whoa, don't ask me about expert analog stuff. I know the basics regarding termination, impedance matching, wave-reflection, and other stuff. But that's about as far as it goes.

Tenchusatsu



To: kash johal who wrote (29432)9/13/1999 9:56:00 PM
From: Alan Bell  Read Replies (6) | Respond to of 93625
 
re: Perhaps if you don't believe me are there any EE's who are long RMBS who can convince John

Can't convince him he is wrong if he isn't!

The signaling logic that DDR uses, SSTL-2, does not need terminators to work electrically if the rise/fall times of the signals are slow enough. But any unterminated signal line will have reflections which cause ringing in the signal. The magnitude of the ringing is related to the rise/fall time of the signal and the length of the trace.

The classic "conditions for short transmission line" are

Length << (1/6) * (Trise/sqrt(LC)

For a signal with a rise time of 2ns, the maximum acceptable length would be 2.3 inches.

So a system could be left unterminated if the data signals are less than 2.3 inches. But if they are longer than this, termination is required. This will then use the kind of power that John describes.