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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 95.53+0.7%12:59 PM EST
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To: Bilow who wrote (33495)11/1/1999 5:38:00 AM
From: John Walliker  Read Replies (2) of 93625
 
Carl,

To imagine that no bad news is left is a failure of the imagination.

Don't you think that the assumption that DDR at increasing speeds will be smoothly integrated without reliability problems is just a bit optimistic - maybe even encompassing a little failure of the imagination?

I can imagine all those reflections bouncing around the bus and having trouble settling in time and I can imagine the power that will be absorbed in the terminators on all those signals.

Have you looked at what clock generators for DDR have to do? (Rhetorical question)

From: ti.com
DALLAS, (Oct. 11, 1999) -- Texas Instruments enhanced its offering of clock driver circuits for PC memory chips by releasing its first device supporting double data rate (DDR) synchronous dynamic random-access memories (SDRAMs). TI's new phase-locked loop (PLL) clock driver circuit provides up to 10 low-jitter, low-skew differential clock signals at speeds up to 170 megaHertz (MHz). The device not only enables designers to build next-generation dual in-line memory modules (DIMMs) that support the PC200 and PC266 DDR-I bus standards, but also allows them to make the transition to the even faster PC300 and PC333 DDR-II standards. See ti.com.

That's an awful lot of clock signals that have to be spread around generating RF interference.

Have a look at ti.com

where you will see all the extra chips that TI have designed to support DDR DIMMs. Its getting a bit complicated, don't you think?

John
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