[oc] Any single chip solution for 1024 FFT/IFFT ?

[haiyun@LegendSilicon.com]

Hi,

i am looking for a single chip solution for 1024-point FFT/IFFT for my 
current project. is there any commerical chip available ? anybody has 
any clue ?

thanks,

haiyun

----- Original Message ----- 
From: Yan Zhang <yzhang@m... > 
To: "'cores@o... '" <cores@o... > 
Date: Fri, 21 Sep 2001 10:35:00 -0700 
Subject: RE: [oc] fft on hardware??or DSP?? 

> Title: RE: [oc] fft on hardware??or DSP?? 
> 
> 
> > > 
> > > The FFT I am designing for opencores should do around 1 
> > > point 
> > > every 10ns in an FPGA. This translates to 10us for 1024 
> > > points. 
> > > Essentially it will be 'real time', allowing a continuous 
> > > stream of data 
> > > to be processed. 
> 
> 
> I also have designed a real time FFT (512 points) logic for 100M 
> ASIC and verified by FPGA. About speed parameter looks like you 
> used at least 8 multipler and number's adders parallel, not 
> pipeline. 
> 
> Thanks 
> 
> Yan 
> 
> > -----Original Message----- 
> > From: gsg43@r...  [mailto:gsg43@r... ] 
> > Sent: 2001Äê9ÔÂ21ÈÕ 6:02 
> > To: cores@o...  
> > Subject: Re: [oc] fft on hardware??or DSP?? 
> > 
> > 
> >   
> > Hi John, 
> > Are you implemeting pipelined fft?? The word real time fft is 
> > giving this meaning... 
> > which algorithm you are using and why? 
> > Shall we get enough speed with pipeline fft on FPGA? I mean 
> > routing delays may effect the design... 
> > IF not so which FPGA will be suitable... 
> > Is opencores giving code for free?? 
> > 
> > I am trying to get brief idea on the fft implementation... I 
> > am planning to simulate(Integer C code) pipelined fft. 
> > Thank you, 
> > gayathri :-) 
> > 
> > ----- Original Message ----- 
> > From: jdalton at asiaonline dot net dot au 
> > To: cores at opencores dot org 
> > CC: jdalton at asiaonline dot net dot au 
> > Date: 17 Sep 2001 21:03:23 -0700 
> > Subject: Re: [oc] fft on hardware??or DSP?? 
> > 
> > > > Hi folks, 
> > > 
> > > Hello 
> > > 
> > > > 1. What is the speed of fastest FFT availabe in the 
> > > market till now? 
> > > 
> > > Not sure. 
> > > 
> > > > 2. I have seen few xilinx FFT documents for virtex 
> > > FPGAs saying 1024 
> > > > FFT in arround 60us. Other DSP vendors giving much 
> > > speed FFTs than 
> > > > FPGAs. 
> > > > So which is suitable for fastest FFT, either DSP or 
> > > FPGA or dedicated 
> > > > chip. 
> > > > what are the limitations in both. 
> 
> > > 
> > > > 3. Can I get faster FFTs in FPGA than DSPs? 
> > > 
> > > My guess is for long transforms, an FPGA will generally 
> > > have a higher thoughput, as it can do more in parallel. 
> > > A DSP could potentially have a shorter latency due to 
> > > more highly optimised multipliers. For very short 
> > > transforms 
> > > a DSP with multiple ALUs might be faster than an FPGA as 
> > > it can do 
> > > everything in parallel with optimised multipliers. 
> > > 
> > > > 4. What are the advantages of FFT on FPGA than in 
> > > DSP? 
> > > 
> > > See previous answer. 
> > > 
> > > Best wishes 
> > > John 
> > > 
> > -- 
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> 
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