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S1 Core (codename Sirocco) is an open source
Open source

Open source is an approach to design, development, and distribution offering practical accessibility to a product's source . Some consider open source as one of various possible design approaches, while others consider it a critical Strategy element of their business operations....
 hardware
Open source hardware

File:Uze open console 09.jpgFile:BUG Group - Hiro P edition.jpgOpen source hardware refers to computer and electronic hardware that is designed in the same fashion as free and open source software ....
 microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
 design developed by Simply RISC
Simply RISC

Simply RISC is a fabless semiconductor company based in Bristol and Catania....
. Based on Sun Microsystems
Sun Microsystems

Sun Microsystems, Inc. is a multinational corporation vendor of computers, computer components, computer software, and information technology services, founded on February 24, 1982....
' UltraSPARC T1
UltraSPARC T1

Sun Microsystems' UltraSPARC T1 microprocessor, known until its 14 November 2005 announcement by its development codename "Niagara", is a multithreading, multicore central processing unit....
, the S1 Core is licensed under the GNU General Public License
GNU General Public License

The GNU General Public License is a widely used free software license, originally written by Richard Stallman for the GNU project. The GPL is the most popular and well-known example of the type of strong copyleft license that requires derived works to be available under the same copyleft....
, which is the license Sun chose for the OpenSPARC
OpenSPARC

OpenSPARC is an open source hardware project started in December 2005. The initial contribution to the project was Sun Microsystems' Register transfer level Verilog code for a full 64-bit, 32-thread microprocessor, the UltraSPARC T1 processor....
 project.

The main goal of the project is to keep the S1 Core as simple as possible to encourage developers. The major differences between T1 and S1 include:










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S1 Core (codename Sirocco) is an open source
Open source

Open source is an approach to design, development, and distribution offering practical accessibility to a product's source . Some consider open source as one of various possible design approaches, while others consider it a critical Strategy element of their business operations....
 hardware
Open source hardware

File:Uze open console 09.jpgFile:BUG Group - Hiro P edition.jpgOpen source hardware refers to computer and electronic hardware that is designed in the same fashion as free and open source software ....
 microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
 design developed by Simply RISC
Simply RISC

Simply RISC is a fabless semiconductor company based in Bristol and Catania....
. Based on Sun Microsystems
Sun Microsystems

Sun Microsystems, Inc. is a multinational corporation vendor of computers, computer components, computer software, and information technology services, founded on February 24, 1982....
' UltraSPARC T1
UltraSPARC T1

Sun Microsystems' UltraSPARC T1 microprocessor, known until its 14 November 2005 announcement by its development codename "Niagara", is a multithreading, multicore central processing unit....
, the S1 Core is licensed under the GNU General Public License
GNU General Public License

The GNU General Public License is a widely used free software license, originally written by Richard Stallman for the GNU project. The GPL is the most popular and well-known example of the type of strong copyleft license that requires derived works to be available under the same copyleft....
, which is the license Sun chose for the OpenSPARC
OpenSPARC

OpenSPARC is an open source hardware project started in December 2005. The initial contribution to the project was Sun Microsystems' Register transfer level Verilog code for a full 64-bit, 32-thread microprocessor, the UltraSPARC T1 processor....
 project.

The main goal of the project is to keep the S1 Core as simple as possible to encourage developers. The major differences between T1 and S1 include:

  • S1 Core only has one 64-bit SPARC
    SPARC

    SPARC is a Reduced Instruction Set Computer microprocessor instruction set Computer architecture originally designed in 1985 by Sun Microsystems....
     Core (supporting 1 to 4 independent threads of execution) instead of 8 cores;
  • S1 Core adds a Wishbone
    Wishbone (computer bus)

    The Wishbone Bus is an open source hardware computer bus intended to let the parts of an integrated circuit communicate with each other. The aim is to allow the connection of differing Open hardware to each other inside of a chip....
     bridge, a reset controller and a basic interrupt controller;
  • the S1 Core environment can be run using only free tools on a common x86 Linux machine.


See also

  • LEON
    Leon

    Leon, L?on or Le?n may refer to:...
  • OpenRISC
    OpenRISC

    OpenRISC is the original, flagship project of the OpenCores community. This project aims to develop a series of general purpose open source RISC Central processing unit architectures....


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