LXP32 CPU by catharanthus

A lightweight, FPGA-friendly 32-bit CPU core

LXP32 is a small 32-bit CPU IP core optimized for FPGA implementation. Its key features include:

  • portability (described in behavioral VHDL-93, not tied to any particular vendor);
  • 3-stage hazard-free pipeline;
  • 256 registers implemented as a RAM block;
  • a simple instruction set with only 30 distinct opcodes;
  • separate instruction and data buses, optional instruction cache;
  • WISHBONE compatibility;
  • 8 interrupts with hardwired priorities;
  • optional divider.

As a lightweight CPU core, LXP32 lacks some features of more advanced processors, such as nested interrupt handling, debugging support, floating-point and memory management units. LXP32 is based on an original ISA (Instruction Set Architecture) which does not currently have a C compiler. It can be programmed in the assembly language covered in the manual.

Copyright (c) 2016-2019 by Alex I. Kuznetsov

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Project Meta

  • Registered 4 months ago
  • Started 3 years ago
  • Last commit 4 months ago

Commits

{"labels":[2016,2017,2018,2019],"series":[["41","6","59","5"]]}

Commits per year

Contributors

{"labels":[2016,2017,2018,2019],"series":[["2","1","1","1"]]}

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Releases

v1.1 is is the latest of 2 releases.

  • v1.1
    Jan 11, 2019 f505bb2
  • v1.0
    Feb 20, 2016 5b92caa

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{"labels":["Others","VHDL","Assembly","C++","C\/C++ Header","make","CMake","TeX","Markdown"],"series":[1,39,20,11,8,6,4,3,2]}

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Data Sheet
Project Web Site
https://github.com/lxp32/lxp32-cpu.git
MIT
Issue Tracker
Last updated 4 months ago
v1.1 released 4 months ago
Language: VHDL
111 commits by 2 contributors
catharanthus Alex I. Kuznetsov
0,8,16,5,8,4,1,8,2,1,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

Activity in last 1 year

Updated 2 months ago