mrisc32-a1
lxp32-cpu
| mrisc32-a1 | lxp32-cpu | |
|---|---|---|
| 3 | 2 | |
| 22 | 55 | |
| - | - | |
| 0.0 | 0.0 | |
| 8 months ago | over 1 year ago | |
| VHDL | Assembly | |
| - | MIT License |
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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.
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Find the leading '0' Verilog question
Here is a different more logic gate:ish solution (in VHDL): https://github.com/mrisc32/mrisc32-a1/blob/master/rtl/alu/clz32.vhd
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Floating point unit in systemc
In my VHDL implementation I use the same iterative divider for integer and for floating-point: https://github.com/mrisc32/mrisc32-a1/blob/master/rtl/muldiv/div_impl.vhd
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.
What are some alternatives?
cvfpu - Parametric floating-point unit with support for standard RISC-V formats and operations as well as transprecision formats.
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.
fpu-sp - IEEE 754 floating point library in system-verilog and vhdl
zipcpu - A small, light weight, RISC CPU soft core
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.
forth-cpu - A Forth CPU and System on a Chip, based on the J1, written in VHDL
microwatt - A tiny Open POWER ISA softcore written in VHDL 2008
hlsVHDL_floating_point
riscv_vhdl - Portable RISC-V System-on-Chip implementation: RTL, debugger and simulators
openpiton - The OpenPiton Platform
VexRiscv - A FPGA friendly 32 bit RISC-V CPU implementation