Definition

RISC-V (pronounced "risk-five") is an open standard Instruction Set architecture (ISA) based on established Reduced Instruction Set Computing principles (RISC). Unlike most other ISA designs, RISC-V is open and freely available for anyone to use, which allows hardware manufacturers to build their processors without the costs associated with licensing proprietary ISAs such as ARM or x86.

RISC-V is increasingly used in various domains, from embedded systems and IoT devices to servers and supercomputers, due to its flexibility, cost-effectiveness and growing ecosystem.

Its development and adoption are overseen by the RISC-V International, a non-profit organisation dedicated to promoting the RISC-V architecture and its ecosystem.

Key Features and Benefits

1. Open and Free - Specifications are available under open source licenses, which eliminates the need for license fees and allows for wide adoption and customisation by companies and individuals.
2. Modular Design - It offers a modular ISA, meaning it has a small base integer ISA, which can be extended with optional modules for additional functionality such as floating-point operations, atomic operations and vector operations. This modularity enables the design of specialised processors that cater to a wide range of applications, from embedded systems to high-performance computing.
3. Simplicity and Efficiency - RISC design principles emphasise simplicity and efficiency. This can lead to more straightforward implementation, lower power consumption and potentially better performance compared to complex ISAs.
4. Wide Support and Adoption - Open nature garners support from lots of stakeholders. This has led to growing ecosystem of software and hardware tools (compilers, OSs, and development boards),
5. Customisability - Organisations can create extensions to the RISC-V ISA and develop highly optimised processors for specific applications without compromising on the compatibility with broader RISC-V ecosystems.