RISC-V International
This page contains the single list of of all ratified technical publications.
ISA Specifications
These are the current, published versions of the ISA specifications. Prior published versions and the original ratification specifications for included extensions can be found on the RISC-V Technical Specifications Archive page.
| Specification name | Version | Publish Date | RISC-V Community | Source Repository |
|---|---|---|---|---|
| The RISC-V Instruction Set Manual Volume I: Unprivileged ISA | 20240411 | May 2024 | Unprivileged Horizontal Committee | riscv/riscv-isa-manual |
| The RISC-V Instruction Set Manual Volume II: Privileged Architecture | 20240411 | May 2024 | Privileged Horizontal Committee | riscv/riscv-isa-manual |
Note: Recently ratified extensions, but not yet included in the full specifications above, can be found on the RISC-V Ratified Extensions page.
Non-ISA Specifications
These are the current, published versions of the non-ISA specifications. Prior published versions may be found on the RISC-V Technical Specifications Archive page.
| Specification name | Version | First Published | Last Updated | Description | RISC-V Community | Source Repository |
|---|---|---|---|---|---|---|
| Efficient Trace for RISC-V | 2.0.3 | June 2022 | April 2024 | Specifies the signals between the RISC-V core and the encoder, compressed branch trace algorithm, and the packet format used to encapsulate the compressed branch trace information to implement processor tracing. | SOC Infrastructure Horizontal Committee | riscv-non-isa/tech-trace-spec |
| RISC-V ABIs Specification | 1.0 | November 2022 | Provides the processor-specific application binary interface document for RISC-V | Application & Tools Horizontal Committee | riscv-non-isa/riscv-elf-psabi-doc | |
| RISC-V Advanced Interrupt Architecture | 1.0 | June 2023 | Describes an Advanced Interrupt Architecture for RISC-V systems. | Privileged Software Horizontal Committee | riscv/riscv-aia | |
| RISC-V External Debug Support | 0.13.2 | March 2019 | Outlines a standard architecture for external debug support on RISC-V platforms. | SOC Infrastructure Horizontal Committee | riscv/tech-debug-spec | |
| RISC-V Functional Fixed Hardware Specification | 1.0.0 | January 2024 | Provides additional system specification for RISC-V systems which use Advanced Configuration and Power Interface (ACPI), specifically for some ACPI object fields of type “Resource Descriptor”. | Privileged Software Horizontal Committee | riscv-non-isa/riscv-acpi-ffh | |
| RISC-V IOMMU Architecture Specification | 1.0.0 | June 2023 | Describes an Input-Output Memory Management Unit (IOMMU) that connects direct-memory-access-capable Input/Output (I/O) devices to system memory. | SOC Infrastructure Horizontal Committee | ||
| RISC-V Platform-Level Interrupt Controller Specification | 1.0.0 | February 2023 | Delineates the operational parameters for a platform-level interrupt controller on RISC-V. | Privileged Software Horizontal Committee | riscv/riscv-plic-spec | |
| RISC-V Supervisor Binary Interface Specification | 2.0.0 | January 2024 | Second publication of the RISC-V Supervisor Binary Interface specification. It added a debug console, system suspend, nested acceleration, steal-time accounting, PMU snapshot, and various error codes; relaxed counter width requirements on PMU firmware counters; reserved space for firmware events; and clarified several extensions. | Privileged Software Horizontal Committee | riscv-non-isa/riscv-sbi-doc | |
| RISC-V UEFI Protocol Specification | 1.0.0 | May 2022 | Details all new UEFI protocols required only for RISC-V platforms. | Privileged Software Horizontal Committee | riscv-non-isa/riscv-uefi |
Note: If you do not see a specification in the above table, visit the RISC-V GitHub riscv-non-isa organization to see a complete list of all specifications which have been developed or are presently under development.
Compatibility Test Framework
The RISC-V Architectural Compatibility Test Framework Version 3 (RISCOF version 1.X) is now available.
This framework compares two arbitrary models against each other using a reference signature (one of which should be a reference model) and automatically selects tests according to the model configuration. Because the RISC-V ISA specification allows many architectural implementation choices, a tool (RISCV-CONFIG) has been created to describe implementation configurations. The RISCOF Framework uses RISCV-CONFIG to select and configure tests.
The current test coverage includes RV[32|64]IMCFD_Zb*_zK*_Zmmul_Zicsr_Zifencei (where * means a lot of sub extensions). Work continues to expand extensions supported and configurations covered.
More information can be found in the following locations
- Compatibility Test Framework (RISCOF) – GitHub repository, Documentation
- Test Framework Configuration Tool (RISCV-CONFIG) - GitHub repository, Documentation
- Architecture Compatibility Test suite (ACT) - GitHub repository, Test format specification
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