# riscv/riscv-isa-manual

RISC-V Instruction Set Manual

Repository: https://github.com/riscv/riscv-isa-manual
Canonical: https://ross.abutalabs.com/products/riscv-isa-manual
Homepage: https://riscv.github.io/riscv-isa-manual/
Language: TeX
License: CC-BY-4.0
License Family: other
Last push: 2026-08-26T18:53:06+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 3499, "days_push": 7, "days_rel": 9, "gap_med": 0, "n_releases_24m": 594}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4786, forks 863 (observed 2026-08-28T04:08:59.807226+00:00)

## What it is
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
- artifact type: learning-resource
- maturity: active
- function: documentation
- domain: documentation, hardware, operating-systems
- platform: cross-platform
- tags: risc-v, isa, specification, cpu-architecture, reference-manual

## Member repositories
- riscv/riscv-isa-manual (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:59.807226+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:18:42.452267+00:00, confidence not recorded.
  - readme: https://github.com/riscv/riscv-isa-manual (fetched 2026-08-28T04:08:59.807226+00:00, sha af7316471406)
  - homepage: https://riscv.github.io/riscv-isa-manual/ (fetched 2026-08-29T09:01:49.776359+00:00, sha 71185a11f3d1)
- Data as of 2026-08-30T08:39:29.467469+00:00.