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

[Azelio Boriani]

The Cray-1 implementation is here http://chrisfenton.com/homebrew-cray-1a/

On Sat, Apr 7, 2012 at 1:47 PM, Javier Herrero <jherrero at hvsistemas.es>wrote:

> El 07/04/2012 13:19, Azelio Boriani escribió:
>
>> 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.
>>
>>  Mostly expensive for amateur use, although reduced free versions exists
> (for Nios-II it is Nios-II/e without MMU and no cache, I suppose that
> something similar for Microblaze). But both are closed-source.
>
> There are open-source soft processors like LatticeMico32 and LEON3. I'm
> moving to one of these for a next project (not yet decided which one, since
> in this case it will be a bare-metal application, with no operating system,
> but I would like to use a processor that is supported by Linux distribution
> for the future). Linux is ported to both, and for LM32 (not sure if for
> LEON3), RTEMS also (see www.milkymist.org , an open source hardware and
> software project with an LM32 implementation on a Spartan 6 FPGA using
> RTEMS. Also there is a plethora of soft implementation of several
> processors in OpenCores (ranging from 6502 to OpenRISC) and also somewhere
> I read about an implementation of a Cray-1 in a Spartan-3 :)
>
> Regards,
>
> Javier
>
>
>
>
>
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