S5 Series


The SiFive S54 Standard Core is a 64-bit embedded processor that is fully-compliant with the RISC-V ISA. It adds support for the F and D standard extensions, which provide the S54 with double-precision floating-point capabilities.

The S54 is ideal for demanding applications such as avionics, signal processing, and industrial automation.


  • Fully compliant with the RISC-V ISA specification
  • RV64IMAFDC Support
    • RV64I – 64-bit RISC-V with 32 integer registers
    • Integer Multiplication and Division (M) support
    • Atomic (A) extension for high-performance, portable software
    • F and D extension for hardware double-precision floating-point
    • Compressed (C) extension for better code density
  • Machine and User Mode Support
  • In-order, 5-6 stage variable pipeline
  • Advanced Memory Subsystem
    • 16KB, 2-way Instruction Cache
    • Instruction Tightly Integrated Memory (ITIM) option
    • Up to 64KB Data Tightly Integrated Memory (DTIM) support
  • Support for up to 40 physical address bits
  • Efficient and Flexible Interrupts
    • Local interrupts w/ vectored addresses — up to 16
    • Platform Level Interrupt Controller (PLIC) — 255 interrupts w/ 7 priority levels
    • RISC-V Core Local Interruptor (CLINT) — 1 timer, 1 SW
  • 8-Region Physical Memory Protection (PMP)
  • High performance TileLink Interface
  • 2.87/1.70 DMIPS/MHz (Best Effort/Legal)
  • 3.01 CoreMark/MHz


Series Overview


The S5 Series offers 64‑bit RISC‑V performance with 32‑bit power and area. The S5 core has a 5-6 stage pipeline, offering a great balance between performance and efficiency.



  • Up to 8 coherent S5 Cores and optional L2 Cache Controller
  • Configurable core performance
  • Double precision Floating Point Unit
  • Level 1 Memory System and ECC
  • Number, type, and width of bus interfaces


  • Consumer Electronics
  • Motor Control
  • Industrial Automation
  • Storage
  • High-performance embedded


CoresAreaStandard CoresARM Comparison
E2 系列 E20 ,E21 ,E24

M0, M0+, M3, M4, M23, M33

E3 系列 E31 ,E31

R4, R5

E7 系列 E76 ,E76-MC

M7, R7, R8

S2 系列 S21


S5 系列 S51 ,S54

R4, R5

S7 系列 S76 ,S76-MC

M7, R7, R8

U5 系列 U54 ,U54-MC

A5, A7, A35, A53

U7 系列 U74 ,U74-MC