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RISC-V [b] (pronounced "risk-five" [2]: 1 ) is an open standard instruction set architecture (ISA) based on established reduced instruction set computer (RISC) principles. . The project began in 2010 at the University of California, Berkeley, transferred to the RISC-V Foundation in 2015, and on to RISC-V International, a Swiss non-profit entity, in November 20
OpenRISC is a project to develop a series of open-source hardware based central processing units (CPUs) on established reduced instruction set computer (RISC) principles. It includes an instruction set architecture (ISA) using an open-source license. It is the original flagship project of the OpenCores community.
An instruction set architecture (ISA) is an abstract model of a computer, also referred to as computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware.
Open source, multithreading, multi-core, 4 threads per core, scalar, in-order, integrated memory controller, 1 FPU UltraSPARC T2: 2007 8 Open source, multithreading, multi-core, 8 threads per core SPARC T3: 2010 8 Multithreading, multi-core, 8 threads per core, SMP, 16 cores per chip, 2 MB L3 cache, in-order, hardware random number generator
OpenSPARC, a series of open-source microprocessors based on the UltraSPARC T1 and UltraSPARC T2 multicore processor designs; Parallax P8X32A Propeller is a multicore microcontroller with an emphasis on general-purpose use; ZPU, a small, portable CPU core with a GCC toolchain. It is designed to be compiled targeting FPGA [4]
In the absence of a widely accepted open source hardware license, the components produced by the OpenCores initiative use several different software licenses.The most common is the GNU LGPL, which states that any modifications to a component must be shared with the community, while one can still use it together with proprietary components.
Processors implement a set of these categories as required for their task. Different classes of processors are required to implement certain categories, for example a server-class processor includes the categories: Base, Server, Floating-Point, 64-Bit, etc. All processors implement the Base category. Power ISA is a RISC load/store architecture.
They have been broadly categorized into "Base Processors", "Multi-Core Processors" and "Experimental Processors". The E and C-classes core are for Internet of things (IoT), embedded system, and desktop computer markets. The processor design is free of any royalty and is open-source licensed under the modified BSD License. [5]