开源架构的实现 Implementations

The RISC-V organization maintains a list of RISC-V CPU and SoC implementations.^[45]

已有 Existing

Existing commercial implementations include:

• Alibaba Group, in July 2019 announced the 2.5 GHz 16-core 64-bit (RV64GCV) XuanTie 910 out-of-order processor, the fastest RISC-V processor to date^[46]
• Andes Technology Corporation, a founding member of RISC-V International^[47] which joined the consortium in 2016, released its first two RISC-V cores in 2017. The cores, the N25 and NX25, come with a complete design ecosystems and a number of RISC-V partners. Andes is actively driving the development of RISC-V ecosystem and expects to release several new RISC-V products in 2018.
• CloudBEAR is a processor IP company that develops its own RISC-V cores for a range of applications.^[48]
• Codasip and UltraSoC have developed fully supported intellectual property for RISC-V embedded SOCs that combine Codasip's RISC-V cores and other IP with UltraSoC's debug, optimization and analytics.^[49]
• Cortus, a founding platinum member of the RISC-V foundation, has a number of RISC-V implementations and a complete IDE/toolchain/debug eco-system which it offers for free as part of its SoC design business.
• GigaDevice has a series of MCUs based on RISC-V (RV32IMAC, GD32V series),^[50] with one of them used on the Longan Nano board produced by a Chinese electronic company Sipeed.^[51]
• GreenWaves Technologies announced the availability of GAP8, a 32-bit 1 controller plus 8 compute cores, 32-bit SoC (RV32IMC) and developer board in February 2018. Their GAPuino GAP8 development board started shipping in May 2018.^[52][53][54]
• IAR Systems released the first version of IAR Embedded Workbench for RISC-V, which supports RV32 32-bit RISC-V cores and extensions in the first version. Future releases will include 64-bit support and support for the smaller RV32E base instruction set, as well as functional safety certification and security solutions.
• Instant SoC RISC-V cores from FPGA Cores. System On Chip, including RISC-V cores, defined by C++.
• SEGGER added support for RISC-V cores to their debug probe J-Link,^[55] their integrated development environment Embedded Studio,^[56] and their RTOS embOS and embedded software.^[57]
• SiFive, a company established specifically for developing RISC-V hardware, has processor models released in 2017.^[58][59] These include a quad-core, 64-bit (RV64GC) system on a chip (SoC) capable of running general-purpose operating systems such as Linux.^[60]
• Syntacore,^[61] a founding member of RISC-V International and one of the first commercial RISC-V IP vendors, develops and licenses family of RISC-V IP since 2015. As of 2018, product line includes eight 32- and 64-bit cores, including open-source SCR1 MCU core (RV32I/E[MC]).^[62] First commercial SoCs, based on the Syntacore IP were demonstrated in 2016.^[63]
• UltraSOC proposed a standard trace system and donated an implementation.
• Western Digital, in December 2018 announced an RV32IMC core called SweRV. The SweRV features an in-order 2-way superscalar and nine-stage pipeline design. WD plans to use SweRV based processors in their flash controllers and SSDs, and released it as open-source to third parties in January 2019.^[64][65][66]
• Espressif^[67] added a RISC-V ULP coprocessor to their ESP32-S2 microcontroller.^[68]

在研 In development

• ASTC developed a RISC-V CPU for embedded ICs.^[69]
• Centre for Development of Advanced Computing, India (C-DAC) is developing a 64-bit out-of-order quad-core RISC-V processor.^[70]
• Cobham Gaisler NOEL-V 64-bit. ^[71]
• Computer Laboratory, University of Cambridge, in collaboration with the FreeBSD Project, has ported that operating system to 64-bit RISC-V to use as a hardware-software research platform.^[72]
• Esperanto Technologies announced that they are developing three RISC-V based processors: the ET-Maxion high-performance core, ET-Minion energy-efficient core, and ET-Graphics graphics processor.^[73]
• ETH Zurich and the University of Bologna have cooperatively developed the open-source RISC-V PULPino processor^[74] as part of the Parallel Ultra-Low Power (PULP) project for energy-efficient IoT computing.^[75]
• European Processor Initiative (EPI), RISC-V Accelerator Stream.^[76][77]
• Indian Institute of Technology Madras is developing six RISC-V open-source CPU designs for six distinct uses, from a small 32-bit CPU for the Internet of Things (IoT) to large, 64-bit CPUs designed for warehouse-scale computers such as server farms based on RapidIO and Hybrid Memory Cube technologies.^[12][78]
• lowRISC is a non profit project to implement a fully open-source hardware system on a chip (SoC) based on the 64-bit RISC-V ISA.^[79]
• Nvidia plans to use RISC-V to replace their Falcon processor on their GeForce graphics cards.^[80]
• SiFive announced their first RISC-V out-of-order high performance CPU core, the U8 Series Processor IP.^[81]