riscv/riscv-isa-manual resource

Health v2 · maintenance only

Adoption not part of the score

4786 stars · 863 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

The official source repository for the RISC-V Instruction Set Manual, containing the unprivileged, privileged, and profiles specification volumes written in AsciiDoc/TeX. It is the canonical reference for the RISC-V instruction set architecture, with builds published as PDFs and HTML.

Use cases

• look up RISC-V instruction encodings and semantics
• understand the RISC-V privileged architecture and CSRs
• check which RISC-V extensions are ratified
• find marchid CSR values for open-source RISC-V implementations
• build the RISC-V spec as PDF or HTML for offline reading
• contribute corrections to the RISC-V ISA specification

When to choose

• you need the authoritative, ratified RISC-V ISA specification
• you are implementing a RISC-V core, assembler, or emulator
• you want to contribute to or track draft changes in the RISC-V specs

When to avoid

• you need a tutorial-style introduction to RISC-V programming
• you want executable software rather than specification documents

Facets

learning-resource · maturity active

documentation documentation hardware operating-systems cross-platform risc-v isa specification cpu-architecture reference-manual

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