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Unlike most other ISA designs, the RISC-V ISA is provided under open source licenses that do not require fees to use. A number of companies are offering or have announced RISC-V hardware, open source operating systems with RISC-V support are available and the instruction set is supported in several popular software toolchains.

Notable features of the RISC-V ISA include a load–store architecture, bit patterns to simplify the multiplexers in a CPU, IEEE 754 floating-point, a design that is architecturally neutral, and placing most-significant bits at a fixed location to speed sign extension. The instruction set is designed for a wide range of uses. The base instruction set has a fixed length of 32-bit naturally aligned instructions, and the ISA supports variable length extensions where each instruction could be an any number of 16-bit parcels in length. Subsets support small embedded systems, personal computers, supercomputers with vector processors, and warehouse-scale 19 inch rack-mounted parallel computers.

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This repository contains the hardware design source files of the Hex Five X300 RISC-V SoC. The X300 is Hex Five's official reference HW platform for its MultiZone Trusted Execution Environment and MultiZone Trusted Firmware. The X300 is an enhanced secure version of the SiFive's Freedom E300 built around the Rocket chip developed at U.C. Berkeley.

  • Updated Jan 23, 2024
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