Airbus Military, Astrium and Cassidian are now Airbus Defence and Space



SCOC3 - Your computer core on a single chip

The development of the SCOC3 relies on the huge experience of Astrium in the field of microelectronic, with more 150 VHDL codes fulfilled since 20 years.

SCOC3 - Your Computer Core on a single chip

The SCOC3 ASIC was designed in order to fulfill 2 major objectives:

  • To take benefit of the lastest electronic integration and minaturisation technologies to reduce mass and cost of the space computers
  • To propose a european universal computer core as a building block for any satellite platform, extendable to payload computer

The LEON3FT Sparc V8 32 bits processor IP has been integrated with standard interface IP used on satellite – SpaceWire, 1553, CAN, UART – and with state of the art utilities for processor such as floating point unit, AHB bus, debug function, memory controller.

CCSDS standard TM/TC control is included in the ASIC. This allows one board to be eliminated with respect to the former platform computer generation.

The ASIC is implemented using the largest matrices of the ATMEL ATC18RHA technology: 3.6 Mgates at 180 nm on a 170 mm² Si chip. The packaging is a LGA 472, offering 342 IO for users over a small surface.

Key Features

  • All the core functions of a platform computer gathered within a single component:
    • LEON 3 FT with GRFPU-FT runs at 80 MHz, offering 74 MIPS
    • CCSDS TM/TC interface offering a MAP interface for cross-strapping of 2 SCOC3
    • Space Wire, 1553, CAN, UART
  • Dual AMBA-AHB bus architecture, with CPU bus and IO bus able to operate at different frequencies
  • CCSDS time management, housekeeping telemetry packetiser
  • Compatibility with both SDRAM and SRAM memories
  • Power management
  • Security module as an option (authentication, crypto)
  • SCOC3 software simulator for users
  • Integrated Development Environment based on Eclipse and RTEMS
  • Debug facilities: IP monitor and LEON DSU for CPU bus
  • Only subject to EU export licenses

Main Application Fields

  • Platform or payload computer
  • LEO, MEO and GEO satellite


Op frequency

32, 48, 64, 80 MHz

Memory gates

2.2 Mbits

Logical gates

1.8 Mgates


LGA 472, 342 users IO


30 x 30 x 6 mm3


12 g


1W @ 32 MHz; 1.9W @ 80 MHz


Voltage in

1.8 V and 3.3 V


SpaceWire, CAN, 1553, UART




ATF280 interface


IP monitor and DSU



-55 °C to +125 °C


100 krad total dose


SEU < 10-5 per day (for LET > 30 MeV)


Latchup free (LET up to 80 MeV)

Failure occurrence

< 150 fit @ 50°C


The development of the SCOC3 relies on the huge experience of Astrium in the field of microelectronic, with more 150 VHDL codes fulfilled since 20 years.

The SCOC3 is provided with the following services to ease its use by system teams:

  • Complete user manual
  • Software environment, including low level software, compiler, simulator, programming interface, test bench and examples of codes.
  • Evaluation boards (STARKIT)
  • Industrial service for the mounting of the MCGA 472 with a space qualified procedure

At software development level, the use of the LEON3 is equivalent to the use of ERC32 based computer. RTEMS is recommended for the operating system. In order to help users in their first steps with the SCOC3, and then to support software development, a SCOC3 software simulator is validated.

The software environment, hosted on a standard PC computer, includes the following items:

  • An Eclipse/CDT based Integrated Development Environment to:
    • build an application using RTEMS compiling tools
    • debug the application with GRMON
  • RTEMS and its SCOC3 custom BSP
  • A Interface Drivers Library for main SCOC3 interfaces: 1553, SpaceWire, CAN, UART, GPIO
  • Sample applications using the Interface Driver Library including source code and make files.

The starter kit SCOC3 system (STARKIT)



Download SCOC3 Fact Sheet (PDF)

Download SCOC3 ASIC Data Sheet (PDF)

Download StarKit Fact Sheet (PDF)

The SCOC3 User Manual is available on request at
(SCOC3 User Manual last issue: I02R06 dated 2012/06/18).