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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