Aquarius SH-2 CPU Core (aquarius-dash)

This repository starts from an SVN mirror of the Aquarius SH-2 compatible CPU core originally published on OpenCores (branch original, commit c435e79), and applies a minimal set of modifications on top (branch main, aka Aquarius' / aquarius-dash).

• Branch original: untouched OpenCores SVN trunk snapshot.
• Branch main: modified version with faster multiplier and added DIVU/DIVS.
• git diff original..main shows exactly what was changed.
• See aquarius-dash.md for a detailed list of modifications, including cycle counts and verification status.

Source

• Origin: OpenCores SVN repository
• Original project page: https://opencores.org/projects/aquarius
• Author: Thorn Aitch
• License: Public domain, with OpenIP License applying to derivative works (see doc/Aquarius.pdf p.2 "Copyright" section for authoritative terms). Any derivative work based on this IP must be free under OpenIP License, with a documented list of modifications ("the same as in GNU").
• SH-2 ISA: The SuperH-2 Instruction Set Architecture is the property of Renesas Technology Corp. Users adopting this core are responsible for judging potential infringements regarding Renesas's rights.
• No warranty on functionality or performance in real hardware.

Contents

Directory	Description
verilog/	CPU core Verilog HDL source files
fpga/	FPGA-specific files (Xilinx UCF, RAM generator)
application/	Sample applications (SH-2 C/assembly) with crt0 and linker scripts
verification/	Test sources and simulation tools
doc/	Original documentation (PDF/DOC)

Notes

• The original branch is a verbatim mirror of the SVN trunk content.
• The CPU implements a subset of the SH-2 instruction set.
• FPGA target in the original project is Xilinx Spartan. For Cyclone V usage, see the parent project.
• Modifications on main affect only verilog/decode.v, verilog/defines.v, verilog/mult.v, plus new testbenches verilog/tb_mult.v and verilog/tb_div.v. All other files are untouched.

About the modifications in this fork

kinopochan makes no claim of rights over the modifications in the main branch. When using this code, please follow the original upstream license (OpenIP License, see above) and include the attribution terms it requires, with a documented list of modifications (this repository's aquarius-dash.md serves as such a list).

この fork の改造差分 (main ブランチ) について、きのぽは特に権利 主張をしません。利用時はオリジナル (上記 OpenIP License) のライセンス に従った表記 + 改造内容の記録を含めてください (本リポジトリの aquarius-dash.md が改造内容の記録として使えます)。