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?



Flash Poll
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

MSGEQ7-Based DIY Audio Spectrum Analyzer: Testing
Max Maxfield
9 comments
In my previous column on this topic, we discussed the step-by-step construction of the first pass at a MSGEQ7-based DIY audio spectrum analyzer for use in my BADASS Display project. Of ...

Karen Field

June 2014 Cartoon Caption Winner
Karen Field
13 comments
Congratulations to "Wnderer" for submitting the winning caption for our June cartoon, after much heated conversation by our judges, given the plethora of great entries.

Jeremy Cook

Inspection Rejection: Why More Is Less in a Vision System
Jeremy Cook
3 comments
Albert Einstein has been quoted as saying, "Everything should be as simple as possible, but not simpler." I would never claim to have his level of insight -- or such an awesome head of ...

Jeremy Cook

Machine Fixes That Made Me Go 'DUH!'
Jeremy Cook
21 comments
As you can see in my bio at the end of this article, I work as a manufacturing engineer. One of my favorite things that happens on a Friday late in the afternoon is to hear my phone ring ...

Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)