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Former ST engineers offer free 64bit processor

Posted: 18 Sep 2006     Print Version  Bookmark and Share

Keywords:Simply RISC  STMicro  Sirocco  S1 core  processor 

Simply RISC, a team of engineers formerly with STMicroelectronics NV who have been working in Catania, Italy and Bristol, England, has produced its first offering, a 64bit processor codednamed Sirocco and now dubbed the S1 core.

It is not clear what business model Simply RISC will pursue as it offers the core for free and free technical support, according to the Simply RISC website.

"Simply RISC develops and supports CPU cores, peripherals and interfaces released under the GNU General Public Licenc (use 's' in verb form)e (GPL) to build up free hardware design of microprocessors, SoC and Networks-on-a-Chip (NoC)," the team said on the website.

The S1 is a "cut-down" version of the OpenSPARC T1 multiprocessor, previously codenamed Niagara that targets embedded devices such as PDAs, STBs and digital cameras.

The OpenSPARC T1 multiprocessor has been released under the GPL licenc (use 's' in verb form)e and features eight SPARC CPU Cores and several peripherals, Simply RISC said on their website. The S1 takes one of the 64bit SPARC cores from that design and adds a "Wishbone" bridge, a reset controller and a basic interrupt controller, to make it easy for a system engineer to integrate the design with other cores. Wishbone is an on-chip bus standard developed with the open hardware community.

As a derivative of the OpenSPARC T1, the S1 retains the ability to execute four concurrent threads at the same time; and operating systems support for OpenSolaris and GNU/Linux distributions, such as Ubuntu and Gentoo, which will detect four different CPUs even if on the chip the CPU core is only one. Simulation and synthesis of Verilog files which make up the S1 design can be done using free software such as Icarus Verilog, Simply RISC said.

Future designs such as SoCs based on S1 and peripherals for it will be released on the Simply RISC website and on and on The OpenCores project has been running as a loose alliance of students and semiprofessional chip developers since 2000.

The open hardware movement is strong in Europe. OpenSoCDesign has a distinct advantage. This Spanish start-up is focusing on system development using open-source cores, and is helping create an infrastructure to make such cores more usable.

The British and Italian origins of Simply RISC has resulted in the group adopting as its logo a square Union flag but with Italian colours.

- Peter Clarke
EE Times

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