Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
edastech
User Rank
Rookie
Root cause of this comparison
edastech   6/4/2014 1:03:04 AM
NO RATINGS
What max has explained is very correct but if you Go to the root cause for this kind
of comparison Xilinx gives gate count information for thr  FPGA 
devices while selecting the capacity of logic for the same and here
starts the confusion when comparing with other vendors like Altera

Max The Magnificent
User Rank
Blogger
re: FPGAs: System gates or logic cells/elements?
Max The Magnificent   9/30/2011 3:06:51 PM
NO RATINGS
There are two totally different things here -- the number of LCs/LEs reflects the amount of logical functionality you can implement -- the process node impacts how fast the device will function (and how much power it will consume).

Willson
User Rank
Rookie
re: FPGAs: System gates or logic cells/elements?
Willson   9/30/2011 12:37:53 AM
NO RATINGS
So you mean that I just have to concern about the number of LEs/LCs, but what if those FPGAs were made with different manufacturing processing, for example, Xilinx Spartan-3 series are made with 90nm processing, and Altera Cyclone series are made with 130nm processing, how do I compare these devices?

SZA
User Rank
Rookie
re: FPGAs: System gates or logic cells/elements?
SZA   3/25/2011 3:49:00 PM
NO RATINGS
PS: Max I reached this article from your Design starts article (http://www.eetimes.com/design/programmable-logic/4214302/What-s-the-number-of-ASIC-versus-FPGA-design-starts-). I noticed you have bug in the cross URL in this article to that above. it crashes due to doubled ref (http://www.eetimes.com/electronics-blogs/other/4210768/%20http://www.eetimes.com/design/programmable-logic/4214302/What-s-the-number-of-ASIC-versus-FPGA-design-starts-)

SZA
User Rank
Rookie
re: FPGAs: System gates or logic cells/elements?
SZA   3/25/2011 3:42:15 PM
NO RATINGS
It is indeed head spinning, I made my PhD on FPGA architectures and always wondered about this strange comparison mystery and used to crush my head when people asked this question :). It is scientifically insane to compare like that!, particularly with heterogeneity (hard blocks), as you mentioned also. The near best thing one can really do is take design and dump it on ISE/Quartus...(often doable with no high effort). One will get rough idea which device of that vendor will/if/may best serve needs.

DrFPGA
User Rank
Blogger
re: FPGAs: System gates or logic cells/elements?
DrFPGA   11/22/2010 5:25:06 AM
NO RATINGS
Soon it will be the ASIC guys who start using LUTs instead of ASIC gates as they try and hang on to their shrinking market in a last ditvh effort to capture some of the bigger FPGA market. Won't that be funny...

Jan.Gray
User Rank
Rookie
re: FPGAs: System gates or logic cells/elements?
Jan.Gray   11/16/2010 6:14:04 PM
NO RATINGS
I agree. Sometimes #LUTs is not the critical resource. Perhaps your design is BRAM or DSP block limited. I recommend vendors quote an FPGA device capability vector e.g. (#LUTs, #BRAM, #DSP, etc.) and/or something more descriptive (#k-LUTs, k, LUT delay, #LUT-RAM, LUT-RAM size/#ports, #BRAM, BRAM size/#ports, #DSP, DSP-size, etc.). See also my old article on this topic, http://www.fpgacpu.org/#021129.

Max The Magnificent
User Rank
Blogger
re: FPGAs: System gates or logic cells/elements?
Max The Magnificent   11/16/2010 5:44:00 PM
NO RATINGS
This topic makes my head spin -- did I miss anything?



Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Carlos Bueno

Adventures in Userland
Carlos Bueno
Post a comment
Editor’s Note: Excerpted from Lauren Ipsum: A story about computer science and other improbable things, author Carlos Bueno introduces us to Lauren and her adventures in ...

Max Maxfield

Tired Old iPad 2 vs. Shiny New iPad Air 2
Max Maxfield
8 comments
I remember when the first iPad came out deep in the mists of time we used to call 2010. Actually, that's only four years ago, but it seems like a lifetime away -- I mean; can you remember ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...