Vendor: Sifive, Inc. Category: CPU

S21 Area optimized 64-bit RISC V processor

The SiFive S21 Standard Core is a full-featured 64-bit embedded processor based on the S2 Series.

RISC-V View all specifications

Overview

The SiFive S21 Standard Core is a full-featured 64-bit embedded processor based on the S2 Series. The S21 has separate Instruction and Data Buses, along with 2 banks of Tightly Integrated Memory (TIMs). The S21 is an ideal choice for area constrained applications demanding a 64-bit processor.

Key features

  • RISC-V ISA - RV64IMAC
  • 64-bit AXI Ports
  • Machine and User Mode with 4 Region Physical Memory Protection
  • 3-stage pipeline with Simultaneous Instruction and Data Access
  • 2 Banks of Tightly Integrated Memory
  • CLIC interrupt controller with 127 interrupts
  • Advanced debug with 4 hardware breakpoints/watchpoints
  • 1.6 DMIPS/MHz
  • 3.2 Coremarks/MHz

Block Diagram

S21 block diagram

What’s Included?

  • RTL Evaluation
  • Test Bench RTL
  • Software Development Kit
  • FPGA Bitstream
  • Documentation

Specifications

Identity

Part Number
S21
Vendor
Sifive, Inc.
Type
Silicon IP

Compute

CPU Architecture
RISC-V

Files

Product Sheet Download

Note: some files may require an NDA depending on provider policy.

Provider

Sifive, Inc.
HQ: USA

Learn more about CPU IP core

Introducing SKL: The SiFive Kernel Library

We’re thrilled to announce the launch of the SiFive Kernel Library or SKL (pronounced “skill”), an open-source collection of highly-optimized computational routines for the RISC-V Vector ISA (RVV) and its various extensions, including SiFive’s matrix engines.

Frequently asked questions about CPU IP cores

What is S21 Area optimized 64-bit RISC V processor?

S21 Area optimized 64-bit RISC V processor is a CPU IP core from Sifive, Inc. listed on Semi IP Hub.

How should engineers evaluate this CPU?

Engineers should review the overview, key features, supported foundries and nodes, maturity, deliverables, and provider information before shortlisting this CPU IP.

Can this semiconductor IP be compared with similar products?

Yes. Buyers can compare this product with similar semiconductor IP cores or IP families based on category, provider, process options, and structured technical specifications.

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