GR740 Quad-Core LEON4 SPARC V8 Processor


The GR740 device is a radiation-hard system-on-chip featuring a quad-core fault-tolerant LEON4 SPARC V8 processor, eight port SpaceWire router, PCI initiator/target interface, CAN 2.0 interfaces and 10/100/1000 Mbit Ethernet interfaces.
The GR740 has been designed as the European Space Agency's Next Generation Microprocessor (NGMP) and is part of the ESA roadmap for standard microprocessor components. The GR740 is the first rad-hard implementation of the NGMP system-on-chip architecture.


  • GR740 components and development boards are immediately available.
  • Information on radiation tests results are further down on this page.
  • All QML qualification tests were completed by the fourth quarter of 2020. Formal approval is expected within six months thereafter, after which formally qualified QML-V and QML-Q parts are made available to customers. Before formal approval QML-V equivalent parts are available. For inquiries, please contact This email address is being protected from spambots. You need JavaScript enabled to view it..


  • System frequency: 250 MHz
  • Main memory interface: PC100 SDRAM
  • SpaceWire router with SpaceWire links 200 Mbit/s minimum
  • 33 MHz  PCI 2.3 initiator/target interface
  • Ethernet 10/100/1000 Mbit MACs
  • CCGA625 / CLGA625 package


  • Fault-tolerant quad-processor SPARC V8 integer unit with 7-stage pipeline, 8 register windows, 4x4 KiB instruction and 4x4 KiB data caches.
  • Double-precision IEEE-754 floating point units
  • 2 MiB Level-2 cache
  • 64-bit PC100 SDRAM memory interface with Reed-Solomon EDAC
  • 8/16-bit PROM/IO interface with EDAC
  • SpaceWire router with eight SpaceWire links
  • 2x 10/100/1000 Mbit Ethernet interfaces
  • PCI Initiator/Target interface
  • MIL-STD-1553B interface
  • 2x CAN 2.0 controller interface
  • 2x UART, SPI, Timers and watchdog, 16+22 pin GPIO
  • CPU and I/O memory management units
  • Multi-processor interrupt controller with support for asymmetric and symmetric multiprocessing
  • SpaceWire TDP controller and support for time synchronisation
The GR740 device is targeted at high-performance general purpose processing. The architecture is suitable for both symmetric and asymmetric multiprocessing. Shared resources can be monitored to support mixed-criticality applications.

Software Support

We provide development tools such as the GRMON software debugger and various compilers and operating systems and a qualified boot loader for flight.

Quad-Core LEON4 Next Generation Microprocessor Development Board

The GR-CPCI-GR740 evaluation board has been designed for evaluation of the GR740 device:


Document File
GR740 Data Sheet and User’s Manual
Documentation for GR740-CP, GR740-MP, and flight models.
GR740-UM-DS.pdf (September 2020)
GR740 Data Sheet and User’s Manual,
Documentation for prototype silicon (GR740-XX and GR740-YY) users.
GR740-UM-DS-1-10.pdf (July 2018)
GR740 Overview Presentation GR740-OVERVIEW.pdf (September 2018)
Comparison Between GR740, LEON4-N2X and NGMP GR740-CMP.pdf (August 2017)
GR740 pinout in Excel spreadsheet format GR740_pinout_rev1-6.xlsx (July 2020)
GR740 Technical Note on Benchmarking and Validation GR740-VALT-0010.pdf (April 2019)
GR740 PCB Design Package
Contains IBIS, BSDL, Package outline assembly drawings, Daisy-chain information
(password protected) (August 2019)
GR740 Power Calculator Spreadsheet GR740powercalculator.xlsx (February 2017)
GR740 Radiation Summary GR740-RADS-1-1-3.pdf (September 2020)

Other Resources

A socket for use with prototype devices is available from Ironwood Electronics. The part number is C14992.