FFT in TI's DSP

"Michael Schoeberl" <nospam-newsgroups@michael-schoeberl.de> escribi&#4294967295; en el 
mensaje news:4293a245$1_2@news.eticomm.net...
> > For FPGA I would like to use Xilinx's chip.
>
> hmm ... I hope you are at least talking about Spartan2 (or above - Spartan 
> 2E for example)
>
> > What I don't know are the price, speed and any other concern.
>
> the chip is cheap (XC2S150E is 22$ at digikey@90pc) but do you have the 
> developement tools and the knowledge?
> can you live without a multiplication?
> can you build the interface to you data-source? (unfortunately this is 
> usually more complicated)

Spartan3 parts are even nicer: XC35200 is between $15 and $17 at Avnet 
(couldn't find at Digikey) in unit quantities.

Multiplicators are included on chip.

-- 
------------------------------
Jaime Andr&#4294967295;s Aranguren Cardona
jaac@sanjaac.com
SanJaaC Electronics
Soluciones en DSP
www.sanjaac.com 

"Mike" <mail2mz@gmail.com> wrote in message
news:1116948847.214232.269800@g49g2000cwa.googlegroups.com...
> Sorry to confuse everyone. Actually I am trying to compare the Pros and
> Cons for the implemetation of FFT using DSP or FPGA.  For DSP,  I would
> like to us TI's chip; For FPGA I would like to use Xilinx's chip. I
> think both of them are able to complete a 128 pt or 256 pt fix point
> FFT. What I don't know are the price, speed and any other concern.
>
> Thanks,
>
> Mike
>

Make sure to include the price of the software unless
you are at a university (can request it free from the xilinx university
program).

Can be quite a large and long learning curve if you have not used fpgas
before.

For the fpga

Going to do your own fft or buy a ip  an ip core ?
eg http://www.andraka.com/cores.htm

for xilinx
Need Xilinx ise  and xilinx system generator
(maybe a good idea to stay away from ise7.1  )

http://www.xilinx.com/products/design_resources/dsp_central/grouping/index.htm

Spartan3 up to 1.5 mil gates can be use with the free webpack tools


For altera
Quartus2 + dsp builder
http://www.altera.com/technology/dsp/dsp-index.jsp

Alex

Alex Gibson wrote:

(snip)

> Make sure to include the price of the software unless
> you are at a university (can request it free from the xilinx university
> program).

Xilinx now has a free version that does many, though not all, of the
chips that they make.   It is, at least, enough to learn how to do it.
It includes the simulator so you can test out designs.

-- glen

"glen herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message 
news:6-GdnUhT-pXGSgvfRVn-3g@comcast.com...
> Alex Gibson wrote:
>
> (snip)
>
>> Make sure to include the price of the software unless
>> you are at a university (can request it free from the xilinx university
>> program).
>
> Xilinx now has a free version that does many, though not all, of the
> chips that they make.   It is, at least, enough to learn how to do it.
> It includes the simulator so you can test out designs.
>
> -- glen
>

Webpack  doesn't have core generator (needed to use most xilinx ip cores)
and doesn't have system generator for dsp (if you need it).

Need basex or above to use the edk (embedded development kit) again if you 
need it.
The edk is nice to have a play with but can suck up fpga gates quickly.

Gives a 32 bit risc soft core + peripherals + gcc
and if you have a v2pro or v4 chip with embedded hard cores,
 it gives gcc and other tools for those.

You get an eval version with the spartan3 starter kits.
(can take xilinx a while to ship the eval kit - mine took 3 months)
http://www.xilinx.com/products/spartan3/s3boards.htm

Also new spartan3e starter kit supposed to be available soon
with 500k gate fpga with ethernet , lcd , etc + usb config and comms
http://www.xilinx.com/products/spartan3e/s3eboards.htm

Webpack usually does the smaller chips  except for spartan3 up to XC3S1500
see http://www.xilinx.com/ise/wp_overview.pdf

Virtex Series :
 Virtex-E: XCV50E - XCV300E , Virtex-II: XC2V40 - XC2V250 ,Virtex-II Pro: 
XC2VP2
Virtex-4: LX: XC4VLX15, XC4VLX25
Spartan Series :
Spartan-II: All , Spartan-II E: XC2S50E - XC2S300E , Spartan-3: XC3S50 - 
XC3S1500
Spartan-3E: XC3S100E - XC3S500E , Spartan-3L: XC3S1000L, XC3S1500L ,
All cplds

List of all available chips
http://www.xilinx.com/products/tables/fpga.htm
http://www.xilinx.com/products/tables/virtex4.htm

All depends on what you need.
Not much difference between webpack and basex.

The new Digilentinc V2pro board looks good if you are at a university
http://www.digilentinc.com/info/XUPV2P.cfm

http://www.xilinx.com/univ/xupv2p.html
http://www.xilinx.com/univ/xupv2p_demo_ref_designs.html
http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux/Downloads/platforms.html 
uclinux for microblaze.

Alex