serv
neorv32
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| serv | neorv32 | |
|---|---|---|
| 19 | 77 | |
| 1,234 | 1,409 | |
| - | - | |
| 7.7 | 9.9 | |
| 7 days ago | 12 days ago | |
| Verilog | VHDL | |
| ISC License | BSD 3-clause "New" or "Revised" License |
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serv
- How many LUT for an 8 bit CPU?
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Minimax: a Compressed-First, Microcoded RISC-V CPU
In short: it works, though the implementation lacks the crystal clarity of FemtoRV32 and PicoRV32. The core is larger than SERV but has higher IPC and (very arguably) a more conventional implementation. The compressed instruction set is easier to expand into regular RV32I instructions than it is to execute directly.
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Apple to Move a Part of Its Embedded Cores to RISC-V
https://github.com/olofk/serv
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I have created a Reddit community about PicoBlaze soft processor...
As for the size advantage: this mattered more when LUTs were precious and when PicoBlaze's competition was either similarly unorthodox (J1 Forth CPU) or several times larger (MicroBlaze). Nowadays, there are very small RISC-V cores like FemtoRV32 Quark or SERV. RISC-V benefits from mainstream open-source tooling and has momentum that's hard to beat.
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RISC-V announces first new specifications of 2022 adding to 16 ratified in 2021
The RISC-V spec does allow non-trapping behavior and SeRV in particular has non-trapping behavior, which is an important part of how it can fit into 200 4-input LUTs.
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looking for 16 bit RISC ISA to implement on cyclon IV FPGA
SERV has an RV32I ISA. It is really light. I am sure it will fit.
- Risc-v with minimum number of gates
- Olof Kindgren on LinkedIn: We have a new world record! 6000 RISC-V cores in a single chip!
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RISCV sim through Verilator
I have tested SERV on Verilator. It was working without any problems.
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Glacial – microcoded RISC-V core designed for low FPGA resource utilization
Along the same lines of minimizing the amount of logic used at the cost of cycles, there's SERV which uses a bit-serial implementation with a 1-bit data path: https://github.com/olofk/serv
From time to time, I have been tempted to design a RISC-V implementation out of discrete TTL components. Sure, there are plenty of projects out there to build your own processor from scratch, but most of them aren't LLVM targets!
The 32-bit datapaths and need for so many registers makes it a bit daunting to approach directly. That approach would probably end up similar in scale to a MIPS implementation I once saw done like that. (Can't find the link, but it was about half a dozen A4-sized PCBs).
Retreating to an 8-bit microcoded approach and lifting all the registers and complexity into RAM and software is a very attractive idea. It's not like it would ever be a speed demon, either way.
neorv32
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Recommendations for RISC-V on FPGA
How about NEORV32?
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SUGGEST AN OPEN SOURCE RISC-V CORE DESIGNED IN VERILOG
GitHub - stnolting/neorv32: 🖥️ A tiny, customizable and highly extensible MCU-class 32-bit RISC-V soft-core CPU and microcontroller-like SoC written in platform-independent VHDL. this one is good but is written in VHDL though
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Anyone want to share some embedded projects they have done?
Maybe not a classic (whatever that means...) project, but I am working (together with others) on a RISC-V microcontroller for FPGAs: https://github.com/stnolting/neorv32
- Mapping compressed 'C' instructions to their 32b counterparts.
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Uploading software program to a custom processor design on a Nexys A7
https://github.com/stnolting/neorv32 ;)
- A tiny and open-source (BSD) RISC-V SoC for (all!) FPGAs
- Looking for help with RISC-V softcore and VHDL
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Risc-v rv32i softcore processor for Zybo-z7-10
How about the NEORV32?
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RISC-V Verilog tutorials
This VHDL RISC-V SoC has a lot of documentation: https://github.com/stnolting/neorv32
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How to verify Embench Benchmark in a RISC-V core?
I am not sure about Embench, but you could start with "porting" CoreMark as there are several implementations out there (like this one).
What are some alternatives?
VexRiscv - A FPGA friendly 32 bit RISC-V CPU implementation
linux-on-litex-vexriscv - Linux on LiteX-VexRiscv
picoMIPS - picoMIPS processor doing affine transformation
upduino-projects - Various VHDL projects I've worked on for the Upduino v2.0 and v3.0
chipyard - An Agile RISC-V SoC Design Framework with in-order cores, out-of-order cores, accelerators, and more
lxp32-cpu - A lightweight, open source and FPGA-friendly 32-bit CPU core based on an original instruction set
fpga-zynq - Support for Rocket Chip on Zynq FPGAs
linux-on-litex-rocket - Run 64-bit Linux on LiteX + RocketChip
ulx3s-toolchain - ULX3S FPGA, RISC-V, ESP32 toolchain installer scripts
riscv-cores-list - RISC-V Cores, SoC platforms and SoCs
riscv-debug-dtm - 🐛 JTAG debug transport module (DTM) - compatible to the RISC-V debug specification.
openFPGALoader - Universal utility for programming FPGA