Changelog

v1.0.0: Ratified Release

Released on 2024-05-22 - GitHub

Released on 2024-04-15 - GitHub

Incorporated comments received during review period

Added glossary
Clarification on instruction id increment
Removed ECS mechanism
Changed third source operand to be multiplexed with destination operand if not in MADD, MSUB, NMSUB, or NMADD opcode
Added guidelines for connecting for than one coprocessor
Allow retraction of compressed transaction through change of instr
Allow register transaction to be retracted based on id/hartid change
Various smaller changes

Released on 2024-02-16 - GitHub

Update of the specification towards ratification.
Major feature changes include:

Introduction of the register interface. This is a backwards-compatible addition, which allows higher performance in deeper pipelines.
Changed behavior of commit interface: Instead of marking a single instruction as to be killed or non-speculative, a single commit transaction can now apply to a group of commits, allowing e.g. a pipeline flush after an exception with a single commit transaction.
Addition of hartid parameter to allow for multiple harts to be connected to a co-processor.

In addition, several textual improvements, typo fixes, and visual improvements have been put in place.

Released on 2024-02-16 - GitHub

This version has been developed by OpenHW Group to continue the development of the interface

Released on 2024-02-13 - GitHub

Initial draft specification