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
  • CLIC for timer and software interrupts
  • PLIC with support for up to 128 interrupts with 7 priority levels
  • Benchmark Scores
    • 2.5 DMIPS/MHz
    • 5.1 CoreMark/MHz

Compare to Cortex-A55

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

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