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Max The Magnificent
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I love asynchronous logic
Max The Magnificent   2/13/2014 11:34:59 AM
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I don't know why, but I love the concept of asynchronous logic -- I know, I know, synchronous logic was good enough for my father and for his father before him, so it should be good enough for me ... but still, I love the concept.

Max The Magnificent
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Re: I love asynchronous logic
Max The Magnificent   2/13/2014 11:37:13 AM
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Actually... did you know that, in the early days, asynchronous logic was the norm. This was for several reasons:

a) Synchronous techniques were not well understood.

b) Synchronous logic used more transistors, which were expensive

c) Everything was crafted by hand -- no automatic tools.

 

TechColab
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Re: I love asynchronous logic
TechColab   2/13/2014 1:50:32 PM
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Surprised the ARM asynchronous processor didn't get mentioned.
http://en.wikipedia.org/wiki/AMULET_microprocessor

betajet
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Re: I love asynchronous logic
betajet   2/13/2014 1:51:01 PM
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And don't forget...

d) Back in those days, you had to keep winding the clock :-)

Max The Magnificent
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Re: I love asynchronous logic
Max The Magnificent   2/13/2014 1:53:29 PM
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@betajet: Back in those days, you had to keep winding the clock :-)

It was the only exercise I got :-)

Garcia-Lasheras
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Re: I love asynchronous logic
Garcia-Lasheras   2/13/2014 5:05:10 PM
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@Max: "I don't know why, but I love the concept of asynchronous logic"

The reason for this is quite simple: this is the way in that Nature works!! Just a couple of examples:
  1. BIOLOGY: asynchronous logic  behaves just as a neuronal network, i.e. data Synchronization is handled by local handshaking and feedback.
  2. PHYSICS: Thes synchronous logic paradigm assumes that you can build a clock that ticks at every point in the space --the registers-- at the same time... but this is just impossible, as you cannot build such a physical system due to the limitations imposed by Einstein's Relativity.

And, by the way, I'm really glad of seeing you and me putting the Async Logic into the headlines again together: this is how we get acquainted just a year ago!!

Garcia-Lasheras
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Re: I love asynchronous logic
Garcia-Lasheras   2/13/2014 5:21:02 PM
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@Max: "Actually... did you know that, in the early days, asynchronous logic was the norm"

In fact, most of the computers that were built in the 50ths and 60ths had asynchronous logic in their inner gears, e.g. ORDVAC, BRLESC II.

As it's explained in this blog, the rise of Moore's law enabled by CMOS technology empowered the synchronous paradigm adoption, but the fall of Moore's law while hitting the nano scale is signaling the beginning of the new Async era!! -- just ask to the Intel guys what is behind most of the papers are presenting this year at ISSCC ;-)

 

Max The Magnificent
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Re: I love asynchronous logic
Max The Magnificent   2/13/2014 5:24:10 PM
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@Garcia: ...this is how we get acquainted just a year ago!!

Is it only a year? It seems like I've known you for much longer (and I mean that in a good way LOL)

tpfj
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Not what Moore's Law says
tpfj   2/13/2014 5:28:53 PM
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Moore's Law says nothing about speed and everything about circuit density. Speed WAS a side effect, but that has waned with advanced nodes. The title should read something like "Asynchronous Techniques Push Circuit Speeds to the Physical Limit". A rather obvious statement if you ask me. Asynchronisity (is that even a word?) has nothing to do with and is completely orthogonal to circuit density.

Max The Magnificent
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Re: Not what Moore's Law says
Max The Magnificent   2/13/2014 5:37:50 PM
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@tpfj: Suddenly a rather obvious statement if you ask me.

Suddenly? Did this "rather obvious statement" take you by surprise? LOL

 

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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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