U7 Series


The SiFive U74 Standard Core is a single-core instantiation of the world’s highest performance RISC-V application processor, capable of supporting full-featured operating systems such as Linux.

The U74 is ideal for applications requiring high-throughput, single-thread performance -- but have power constraints (e.g., AR, VR, sensor hubs, IVI systems, IP cameras, digital cameras, gaming devices, etc.)

U74 Key Features
  • Fully-compliant with the RISC-V ISA specification
  • RV64GC U74 Application Core
    • 32KB L1 I-cache with ECC
    • 32KB L1 D-cache with ECC
    • 8 Region Physical Memory Protection
    • 128 Global Interrupts per core
    • Sv39 Virtual Memory support with 38 Physical Address bits

  • Integrated 128KB L2 Cache with ECC
  • CLINT for timer and software interrupts
  • PLIC with support for up to 128 interrupts with 7 priority levels
  • Benchmark Scores
    • 4.27/2.5 DMIPS/MHz (Best Effort/Legal)
    • 5.1 CoreMark/MHz
Instruction Set Architecture
S+U+M Mode
ARMv8.2, AArch32, AArch64
16-bit Instruction Support
Only in 32-bit AArch32 T32 Mode
Physical Memory Protection
MMU only
Real-Time Capabilities
Real-time capable
Interrupt Controller
Licensed Separately; requires separate integration
Memory Map

U74 Development Kit

Dev Kit Deliverables

  • RTL Evaluation
  • Test Bench RTL
  • Software Development Kit
  • Documentation
Series Overview

U7 Series

The U7 Series features SiFive’s highest-performance RISC-V Linux-capable application processor. The U7 core has a superscalar 8-stage pipeline with support for virtual memory, enabling the most demanding 64-bit RISC-V applications such as Edge Compute, Big-Data Analytics and 5G Base Stations.

U7 Series Highlights

Key Features

  • Up to 8 (+1) coherent high-performance RISC-V application processors
  • Supports an in-cluster coherent combination of application processors with real-time processors (U7 and S7)
  • Application processors with deterministic response
  • High-performance L1 memory microarchitecture
  • Physical Memory Protection
  • New microarchitecture features for enhanced security and real-time determinism


  • Enterprise Storage, Smart NICs
  • Edge Analytics, Big-Data Analytics
  • Autonomous Machines
  • Edge Compute and Switching/Routing
  • 5G Base Stations

All Standard Cores

Standard Cores
ARM Comparison
E2 Series
M0, M0+, M3, M4, M23, M33
E3 Series
R4, R5
E7 Series
M7, R7, R8
S2 Series
S5 Series
R4, R5
S7 Series
M7, R7, R8
U5 Series
A5, A7, A35, A53
U7 Series
Core Evaluation

From idea to reality.

Ready to see your code in action? The U74 Development Kit enables free evaluation of SiFive RISC-V Core IP.


Evaluation RTL

  • Full-Functional, synthesizable Verilog RTL
  • Run it in your own simulator
  • Simple, no-cost evaluation license
Start U74 Free Trial