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Garcia-Lasheras
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Re: I love asynchronous logic
Garcia-Lasheras   5/15/2014 5:20:20 PM
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@AZskibum: "I'm curious what tools all you "I love asynchronous logic" guys are using to implement and verify your designs."

Well, last week I used standard VHDL in order to describe a 4000 stages-depth asynchronous micropipeline in the Xilinx Zynq device that powers my Zedboard. No strange circuitry, tools.... just PlanAhead+Xise+plain HDL description.


P.S.: Sorry for my late reply, I missed this post!!

AZskibum
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Re: I love asynchronous logic
AZskibum   3/30/2014 1:50:16 PM
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I'm curious what tools all you "I love asynchronous logic" guys are using to implement and verify your designs.

Garcia-Lasheras
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Re: I love asynchronous logic
Garcia-Lasheras   3/13/2014 7:39:24 PM
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@tb100: "You would almost think that Intel was up to something!"

Very impressive!! You really manage to stay on top of things!!

But I would add one more deal: Intel funded Silistix, a Manchester Unversity start-up leaded by Steve Furber (one of the original ARM architects) and which focused in the development of an asynchronous On-Chip core interconnect.

You can find more info in the next Silistix Limited website -- where references to Intel has been convenently suppressed, of course ;-)

tb100
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Re: I love asynchronous logic
tb100   3/12/2014 4:30:12 PM
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Intel has been involved with a number of asynchronous logic companies. They bought Fulcrum, which has a number of chips, including Ethernet switches, that use asynchronous logic inside. And they partner with Achronix, which makes FPGAs that utilize asynchronous techniques for internal data pipelining. 

You would almost think that Intel was up to something!

 

 

jackOfManyTrades
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Re: I never metastable I liked
jackOfManyTrades   2/17/2014 3:17:01 AM
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30 ns is plenty of time if you register inputs and outputs at the I/O pads and have point-to-point connections that are less than 12 inches

Ah...interesting.

Garcia-Lasheras
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Re: I never metastable I liked
Garcia-Lasheras   2/15/2014 3:25:24 PM
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Clock gating is also supported in most of the clock buffers in Xilinx 7 Series devices, e.g. in global clock buffers (BUFG) and horizontal clock buffers -- a regional clock distribution network -- (BUFH).

You can also select a lot of different clock inputs for each different clock distribution network, including internally generated clocks.

Ther is more info about this in the next user guide:

Xilinx UG472 7 Series Clocking

betajet
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Re: I never metastable I liked
betajet   2/15/2014 2:22:33 PM
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Thanks!  I didn't realize they had that capability.  I may need that feature some day.

 

Brian_D
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Re: I never metastable I liked
Brian_D   2/15/2014 12:53:20 PM
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@betajet "The FPGAs I'm familiar with won't let you do this, because the global clocks don't have clock enables [that are visible to the designer]"

Xilinx introduced a synchronously gated global buffer with the Virtex-2 (IIRC) family, which is called BUFGCE in the library primitives guides.

The underlying global buffer also supports sync/async clock muxing capabilities, exposed under a different library primitive name.

Their newer families also support gated regional clock buffers.

-Brian

Garcia-Lasheras
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Re: Moore's law.....
Garcia-Lasheras   2/14/2014 7:12:32 PM
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@Max: "I remember a time when I thought Sun Microsystems would be around for ever ... it's like the old saying goes: "The bigger they are, the harder they fall" -- it was a sad day when they disappeared :-("

Yes, a very sad day. I really loved SUN Microsystem: its technology, both hardware and software, its openness, its advanced research... Some people think that they were too smart, commited and professional for staying alive in these weird days we are living now.

Max The Magnificent
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Re: Moore's law.....
Max The Magnificent   2/14/2014 7:06:25 PM
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@Garcia: ...finally, Oracle was the one which absorbed the company I was dealing with: SUN Microsystems

I remember a time when I thought Sun Microsystems would be around for ever ... it's like the old saying goes: "The bigger they are, the harder they fall" -- it was a sad day when they disappeared :-(

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