[time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

shalimr9 at gmail.com shalimr9 at gmail.com
Sat Apr 7 12:17:16 EDT 2012


When you install the Altera tools, it automatically installs NIOS and gcc. I assume there are no restrictions for private use, but you may have to send $ if you make a commercial product. That remains to be checked.

I have not used NIOS either.
Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: Azelio Boriani <azelio.boriani at screen.it>
Sender: time-nuts-bounces at febo.com
Date: Sat, 7 Apr 2012 13:19:14 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

The Xilinx and Altera have their embedded CPUs (Microblaze and Nios) IP.
I'm not familiar with them and don't know how much they cost. Until now I
have developed on Xilinx 50Kgates FPGA and 128 cells CPLD with the Xilinx's
free tools.

On Sat, Apr 7, 2012 at 7:53 AM, Chris Albertson
<albertson.chris at gmail.com>wrote:

> On Fri, Apr 6, 2012 at 9:41 PM, Andrew Rodland <andrew at cleverdomain.org>
> wrote:
>
> > Another option would be building something on an FPGA. This would be a
> > considerable stretch for me, since I've never done FPGA work, but if I
> build
> > from the ground up, I can have *very* tight control over things that are
> chosen
> > for me with a micro controller.
>
>
> A compromise is to find a "soft core" for the FPGA.  This is a CPU
> implemented in FPGA and then it runs software just like a "real" CPU.
>  This would let you move your micro controller based be sign over to
> the FPGA quickly.   After that you can implement some specialized
> peripherals that do time stamping
>
>
> How does the performance of the Arduino based NTP compare with what
> you could do with Linux on (say) and Atom or ARM processor?
>
>
>
>
> Chris Albertson
> Redondo Beach, California
>
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