[Ronja] Trying out a FPGA

[Jakub Ladman]

Here is the fastest mirror
http://kuba.tharrrk.net/spider/
Unfortunately, there is not any english version.

Verilog code compiled for CPLD can be compiled also for FPGA, but i have no 
experience with any FPGA, but its much larger capacity may be very nice.
CPLDs are a little bit faster, than FPGAs, but here, where 32MHz maximal 
frequency is used it will be no problem.

Xilinx webpack gives you information about speed of the project after its 
compilation.

Jakub Ladman


Dne Sunday 16 March 2008 02:52:13 Arun Krishnan napsal(a):
> Hi.
>
> http://bleesmrt.hopto.org/~ladmanj/spider/
>
> Regards,
> Arun
>
>
> ----- Original message -----
> From: "eldis" <eldis111 at seznam.cz>
> To: "Twibright Ronja" <ronja at lists.pointless.net>
> Date: Sat, 15 Mar 2008 22:30:57 +0100
> Subject: Re: [Ronja] Trying out a FPGA
>
> Very important thing - ADC/DAC must be High-speed..
> I assume, that you are talking about Spartan-IIIE Starter kit - look at
> manual, it will be way too slow.
>
> eldis
>
> > Thanks for the info Gregory,
> >
> > It does have an integrated ADC/ DAC,  I will discuss the possibility
> > with my instructors...
> >
> > By the way does anyone have the link for the spider project?
> >
> > Thanks
> >
> > Saad
> >
> > */Gregory Maxwell <gmaxwell at gmail.com>/* wrote:
> >
> >     On Thu, Mar 13, 2008 at 3:00 PM, Saad Shakeel
> >
> >     wrote:
> >     > Hi everyone,
> >     >
> >     > Just got a SPARTAN 3-E FPGA..... and was wondering if i can
> >
> >     implement the
> >
> >     > some parts of the RONJA on it as well....
> >     > I came across the SPIDER project, which was implemented on a
> >
> >     CPLD, but i'm
> >
> >     > not sure if a CPLD code is compatible with an FPGA too?
> >
> >     If you have a DAC and ADC chips you could implement the pretty much a
> >     complete signal chain... QAM (de)modulation on the FPGA, error
> >     correction, equalization, etc.
> >
> >     A ronja type device could consist of little more than:
> >
> >     [ethernet mac] - [fpga] - [dac] - [voltage to current amp] - [Tx LED]
> >     - [adc] - [preamp] - [RX sensor]
> >     - [small dac] / < AGC
> >
> >     A digital signal chain like this is, in my opinion, the most cost
> >     effective way to achieve speeds of 100mbit without switching to laser
> >     diodes.
> >
> >     QAM 16 would should be able to fit 100mbit into the (post
> >     equalization) bandpass or the LEDs being used for 10mbit ronja today,
> >     though I do not know what the SNR is like on real paths.
> >
> >     --
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> >     Ronja at lists.pointless.net
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> >
> >
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