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mhrackin
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Re: What's old is new again
mhrackin   8/13/2014 4:08:00 PM
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The similarities are far too strong to ignore.  Although the details are quite sparse, I would hazard a guess that these would have to share some of the properties that doomed bubble memory (which i actually played with quite a bit back in the '70s).  They include: serial nature, which then leads to access time issues, and apparently destructive bit read, necessitating read-modify-write on EACH BIT during readout.

R_Colin_Johnson
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Re: What's old is new again
R_Colin_Johnson   8/13/2014 3:10:12 PM
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"This sounds like the magnetic bubble memory of the 70's. A good idea that never scaled out to be useful." Jack Peacock
I was thinking the same thing until I spoke with IBM who claims that the Racetrack Memory is still an active projects with papers published yearly about progress being made. Of course, only time will tell :)

Jack Peacock
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What's old is new again
Jack Peacock   8/13/2014 9:57:39 AM
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This sounds like the magnetic bubble memory of the 70's.  A good idea that never scaled out to be useful.

  Jack Peacock

resistion
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Current density and voltage
resistion   8/13/2014 9:53:19 AM
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I remember current density and voltage were concerns. It goes over quite a long distance..

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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