lxp32-cpu
mrisc32-a1
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lxp32-cpu | mrisc32-a1 | |
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2 | 3 | |
55 | 22 | |
- | - | |
0.0 | 0.0 | |
over 1 year ago | 7 months ago | |
Assembly | VHDL | |
MIT License | - |
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lxp32-cpu
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Minix
If you're willing to go REAL slow, there's still FPGAs. Something like this perhaps. Adoption would be pretty damned limited though, so your point stands.
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What is a list of all softcores that were designed purely using VHDL?
I used this one https://github.com/lxp32/lxp32-cpu as base for building a RISC-V softcore.
mrisc32-a1
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Got any good reads on floating point math design?
I saw a particularly efficient VHDL implementation in the mrisc32-a1, though this is lacking support for rounding modes. Together with the rest of the processor this is a very interesting project, I hope that the author progresses it further.
What are some alternatives?
zipcpu - A small, light weight, RISC CPU soft core
neorv32 - :rocket: A tiny, customizable and extensible MCU-class 32-bit RISC-V soft-core CPU and microcontroller-like SoC written in platform-independent VHDL.
RISC-V-Guide - RISC-V Guide. Learn all about the RISC-V computer architecture along with the Development Tools and Operating Systems to develop on RISC-V hardware.
microwatt - A tiny Open POWER ISA softcore written in VHDL 2008
riscv_vhdl - Portable RISC-V System-on-Chip implementation: RTL, debugger and simulators
openpiton - The OpenPiton Platform
fpu-sp - IEEE 754 floating point library in system-verilog and vhdl
cvfpu - Parametric floating-point unit with support for standard RISC-V formats and operations as well as transprecision formats.
mandelbrot_riscv_assembler - An example in bare metal RV32 assembly for the longan nano board
VexRiscv - A FPGA friendly 32 bit RISC-V CPU implementation
spam-1 - Home Brew 8 Bit CPU Hardware Implementation including a Verilog simulation, an assembler, a "C" Compiler and this repo also contains my research and learning. See also the Hackaday.IO project. https://hackaday.io/project/166922-spam-1-8-bit-cpu