Nucleus RTOS

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Nucleus RTOS
Developer Mentor Graphics
Written in C
OS family Real-time operating systems
Working state Current
Source model Closed source
Latest release 3.x / September 15, 2009; 7 years ago (2009-09-15)
Available in ?
Platforms ARM, Freescale, MIPS, IBM PowerPC, Altera Nios II, Xilinx MicroBlaze, Renasas SuperH, Infineon, Atmel AT91SAM and others [1]
Kernel type Real-time kernel
Default user interface ?
License Proprietary
Official website Nucleus RTOS

Nucleus RTOS is a real-time operating system (RTOS) offered by the Embedded Software Division of Mentor Graphics for various central processing unit (CPU) platforms. Nucleus RTOS is embedded software and is in an estimated 2.11 billion devices worldwide.[2]

Development is typically done on a host computer running Windows or Linux. Applications are cross compiled to run on various target CPU architectures and tested using the actual target boards or in simulation environment.

The Nucleus RTOS is designed for deeply embedded systems applications including consumer electronics, set-top boxes, cellular phones, and other portable and handheld devices. For limited memory systems Nucleus RTOS can be scaled down to a memory footprint as small as 13 KB for both code and data.[citation needed]



  • Real time kernel
  • C++, POSIX and Micro ITRON interfaces
  • Dynamic download
  • Inter-process communication
  • Closed Source (however, the source code is available to customers, making it easier to debug than operating system distributed as binaries only)


File System[edit]

  • File Allocation Table (FAT)
  • CD-ROM
  • Virtual file system Application Programming Interface (API)


  • Low-level rendering
  • Windowing system
  • Multi-media GUI control framework


  • Encryption
  • Hash and signature algorithms
  • Key exchange protocols

Products using Nucleus RTOS[edit]

Mentor Graphics boasts Nucleus installment base of over 1.6 billion mobile devices,[3] as of mid-February, 2010 and 2.11 billion devices as of June 2010. According to a report[4] by an analyst firm, Nucleus has been shipped in over 2.84 billion devices as of the end of 2010.

Example devices using Nucleus products are as follows:


External links[edit]