RISC-V SoCs: Powering Embedded Computing

RISC-V is an open-source standard instruction set architecture (ISA) that is managed by the non-profit RISC-V Foundation. This modular ISA has a base instruction set and optional extension sets. Because RISC-V is free and open-source, it has gained popularity worldwide. Over 65 RISC-V cores, both commercial and open-source, are available today.

Efinix has created 3 RISC-V SoCs based on the VexRiscv core created by Charles Papon. The VexRiscv core, which won first place in the RISC-V SoftCPU contest in 2018, is a 32-bit CPU using the ISA RISCV32I with M and C extensions, has five pipeline stages (fetch, decode, execute, memory, and writeback), and a configurable feature set. Each SoC has a RISC-V processor, memory, a range of I/O, and interfaces for embedding user functions. You can easily create entire systems that include embedded compute and user-defined accelerators all in the same Trion® FPGA.

Jade SoC

Cached, high-performance SoC with a DDR DRAM controller interface. Ideal for applications that provide real-time system controls and perform image signal processing.

  • ~12K LEs/78 RAM blocks
  • 50 MHz
  • 1.16 DMIPS/MHz
  • Up to 3.5 GB DDR DRAM
  • 4 KB on-chip RAM
  • 16 GPIO
  • Timer
  • PLIC
  • 3 SPI masters
  • 3 I2C masters/slaves
  • 2 UARTs
  • 1 AXI4 user peripheral
  • 2 APB3 user peripherals
Ruby block diagram

Ruby Risc-V SoC Data Sheet

Ruby Risc-V SoC Hardware and Software User Guide

Jade SoC

Cached, general-purpose SoC that blends performance with a smaller footprint. Ideal for applications that use communications protocols, such as command and control, industrial automation or data logging.

  • ~7K LEs/93 RAM blocks
  • 50 MHz
  • 1.2 DMIPS/MHz
  • 32 KB on-chip RAM
  • 16 GPIO
  • Timer
  • PLIC
  • 2 SPI masters
  • 2 I2C masters/slaves
  • 1 UART
  • 1 APB3 user peripheral
Jade block diagram

Jade Risc-V SoC Data Sheet

Jade Risc-V SoC Hardware and Software User Guide

Jade SoC

Cacheless, compact SoC with a small resource footprint. Ideal for applications that require embedded compute capability such as system monitoring or remote configuration and control.

  • ~5K LEs/16 RAM blocks
  • 50 MHz/20 MHz
  • 0.98 DMIPS/MHz
  • 4 KB on-chip RAM
  • 8 GPIO
  • Timer
  • PLIC
  • 1 SPI master
  • 1 I2C master/slave
  • 1 UART
  • 1 APB3 user peripheral
Opal block diagram

Opal Risc-V SoC Data Sheet

Opal Risc-V SoC Hardware and Software User Guide

What's in the Package?

With each RISC-V SoC, Efinix provides a complete package of hardware and software files. Additionally, to help you develop software applications, Efinix distributes a collection of pre-compiled open-source software. With these packages, you can:

  • Build RTL designs using the Ruby, Jade, or Opal RISC-V SoC using an example design targeting an Efinix development board, and learn how to extend the example for your own application.
  • Set up the software development environment using an example project, create your own software based on example projects, and use the provided API.

SoC Design Flow

SoC Design Flow


  • SoC RTL files
  • SoC testbench
  • Example design targeting an Efinix development board


  • Board support package (BSP)
  • Linker script
  • SoC include header files
  • OpenOCD configuration files
  • Example software applications


  • Eclipse IDE for managing projects and software
  • GCC compiler
  • OpenOCD debugger for debugging
  • Windows build tools (Windows)

Efinity Software Support

The SoCs are fully supported by the Efinity® software, which provides a complete tool flow from RTL design to bitstream generation, including synthesis, place-and-route, debugging, and timing analysis. The software has a graphical user interface (GUI) that provides a visual way to set up projects, run the tool flow, and view results. The software also has a command-line flow and Tcl command console. The software-generated bitstream file configures Trion devices. The software supports the Verilog HDL and VHDL languages.