Vector Acceleration IP core for RISC-V*.

Vector Acceleration IP core for RISC-V* is a flexible RISC-V Vector unit that aims to support RISC-V Vector extension. The interface is based on OVI (Open Vector Interface) in order to integrate with different scalar cores. The code is written with Chisel.

So far, the arithmetic functional units are sufficiently tested. Other functions such as load/store and control flow only passed basic test.

Arithmetic FUs are located at src/main/scala/darecreek/exu/vfucore/, which contains 64-bit FU cores (mask and permutation are VLEN-bit). You can write a wrapper to compose multiple 64-bit FUs into one VLEN-bit FU. In this project, the exu/lanevfu and exu/crosslane are FU wrappers (with VLEN=256).

Note: this project is suspended now.

As shown below, it is an out-of-order vector core with OVI interface (orange arrows). There are one arithmetic issue queue and one load/store issue queue, which can operate simultaneously. Each issue queue issues micro-ops in order, but it can be modified to out-of-order issuing potentially.

Please refer to Design Introduction for more details.

Only the OVI(Open Vector Interface) is under Solderpad Hardware License v2.1 and others follow the Mulan PSL v2.