AndesCore™ S8

Compact Processor for Security

AndesCore™ S8 Overview

  • Secure MPU against memory tampering
  • Shields against side-channel attack
  • Secure debug for multi-party software development
  • Flexible configurations and run-time control

Enhanced security is becoming essential as IoT devices find their way in to home automation and wearable applications. In addition to security, these applications demand low power consumption and high performance to handle compute intensive functions such as processing sensor data and wireless protocol stacks. The Andes Technology S8 processor is a new CPU core architecture based on the compute engine in the N8 core, but with added functionality to address security from hacking. The secure memory protection unit (MPU) at the center of the S8 strictly protects the execution and access according to multiple security levels. S8 also provides functions not found on competing 32-bit CPU core offerings: data and address scrambling and differential power analysis protection. The first defends against hacks that target the interface between CPU and memory. The second guards against hacking the program by observing the power use signature of the CPU. 


  • Smart card
  • Memory card
  • Health card
  • Access card
  • Passport
  • Driving license
  • Telephone card
  • Library card

Block Diagram

Development Tools

  • AndeSight™ Integrated Development Environment
  • AICE JTAG/SDP debugger hardware

Key Features and Performance

AndeStar™ V3 Architecture

Key FeaturesBenefits
21st-century RISC-like instruction set 21st-century RISC-like instruction set
V3 subset for MCU most frequency used instructions Smaller die size and lower power consumption
16/32-bit mixable opcode format Smaller code size
AndeStar Security Extension Micro Profile Secure core capabilities
All-C Embedded Programming Faster SW development and easier maintenance
Hardware divider More performance
Direct support of up to 32 interrupts with programmable priority levels Quick identification of interrupt sources and fast assignment of service routines
16MB or 4G address space Less address bits option leading to small gate count
Memory mapped IO Easy to program and friendly to compiler

CPU Core

Key FeaturesBenefits
1.53 DMIPS/MHz*  3.02 CoreMark/MHz*Superior performance-per-MHz
3-stage pipeline Superior performance-efficiency, while allowing for high speeds
Secure MPU & secure debugging Code and data protection

Choice of multipliers

  • Fast (1 cycle) for performance
  • Small (<0.5K gates) for size

Application specific configurations

  • More performance
  • Smaller size
Processor state bus Simplification SoC design and debugging
Performance monitors Program code performance tuning

Interface to FlashFetch IP (Separately licensable) which contains following options

  • Prefetching functionality
  • Caching functionality
  • SPI interface to external flash
Slow flash memory acceleration and power consumption reduction
Extensive clock gating and logic gating Lower power
N:1 core/bus clock ratios Simplified SoC integration
Low-latency vectored interrupt Faster context switch for real-time applications
Completion of most operations in 1 cycle Single-cycle capable for Local Memory and AHB bus accesses Better performance-efficiency

* BSP v4.2.0, DMIPS/MHZ without no-inline option, best performances

Memory Subsystems

Key FeaturesBenefits

Optional External Instruction and Data Local Memory

  • Size: 0KB to 4MB
  • ILM: program code, data and IO
  • DLM: program data and IO

Higher efficiency for program execution

  • Flexible size selection to fit diversified needs
  • Capable of replacing DLM and bus for lower cost
  • Capable of replacing bus for lower cost
BIU supports AHB-lite or APB User-selectable bus interface for optimal efficiency

Debug Support

Key FeaturesBenefits
2-wire Serial Debug Port or 5-wire JTAG Debug Port Low-cost 2 wire support and industry-standard 5-wire support

Embedded Debug Module (EDM)

  • Up to 8 breakpoints and watchpoints
  • Secured debug access to system address space
  • Flexible configurations to trade off gate count and debugging capabilities
  • Code and data protection by allowing only authorized debugging


Frequency (MHz)780
Dynamic power (uW/MHz)8.0
Area (mm2)0.024

* Base configuration, LVT library; Frequency at slow process corner, 0.81V, 125°C and without I/O constraint; Power consumption at typical process corner, 0.9V, 25°C