Open Vector Interface (OVI)

Concept

Open Vector Interface (OVI) is the custom interface used in the documented European Processor Initiative RISC-V vector accelerator work to connect a scalar processor core with a decoupled Vector Processing Unit (VPU). It defines seven sub-interfaces for instruction issue, dispatch/kill confirmation, completion reporting, memory-operation signaling, load/store data movement, and mask/index address-generation support, and it served as a major verification boundary in the UVM-based functional verification environment.

First seen 5/27/2026

Last seen 5/28/2026

Evidence 8 chunks

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WIKI

Open Vector Interface (OVI)

Open Vector Interface (OVI) is the custom interface used in a RISC-V-based decoupled vector accelerator to connect the vector accelerator / Vector Processing Unit (VPU) with a scalar processor core.[OVI role] In the documented European Processor Initiative verification work, the accelerator implemented version 0.7.1 of the RISC-V Vector extension and was connected to the scalar processor core through OVI.[OVI role]

System role

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RELATIONSHIPS

5 connections

Vector Processing Unit (VPU) ← uses 99% 6e

The VPU is connected to the scalar core via the Open Vector Interface.

Functional Verification of a RISC-V Vector Accelerator ← evaluates 97% 4e

The paper evaluates the OVI protocol with assertions and scoreboard comparison.

Vector Processing Unit (VPU) part of → 92% 1e

OVI is the interface through which the VPU connects to the scalar core

SemiDynamics ← introduces 92% 1e

SemiDynamics developed the Open Vector Interface

Speculative Instruction Issue ← part of 92% 1e

OVI enables speculative issue of vector instructions via the DISPATCH sub-interface

LINKED ENTITIES

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Functional Verification of a RISC-V Vector Accelerator EVALUATES Extracted graph relationship

Vector Processing Unit (VPU) USES Extracted graph relationship

SemiDynamics INTRODUCES Extracted graph relationship

Speculative Instruction Issue PART_OF Extracted graph relationship

CITATIONS

10 sources

10 citations — click to expand

[1] OVI role Functional Verification of a RISC-V Vector Accelerator

[2] Scalar-core role Functional Verification of a RISC-V Vector Accelerator

[3] VPU context Functional Verification of a RISC-V Vector Accelerator

[4] OVI sub-interfaces Functional Verification of a RISC-V Vector Accelerator

[5] OVI handshaking Functional Verification of a RISC-V Vector Accelerator

[6] Verification boundary Functional Verification of a RISC-V Vector Accelerator

[7] UVM modeling Functional Verification of a RISC-V Vector Accelerator

[8] Result checking Functional Verification of a RISC-V Vector Accelerator

[9] OVI assertions Functional Verification of a RISC-V Vector Accelerator

[10] OVI specification reference Functional Verification of a RISC-V Vector Accelerator