Cobham Gaisler AB provides IP cores and supporting development tools for embedded processors based on the SPARC architecture. We specialize in digital hardware design for both commercial and aerospace applications
GR740 Quad-Core LEON4 SPARC V8 Processor
Introduction
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.
Schedule
- GR740 prototype devices and development boards are immediately available.
- Radiation tests of the first silicon have been performed during 2016. Results are summarized in the validation technical note further down on this page.
- Flight models will use a silicon revision currently in development.
Specification
- 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
- CLGA625 package
Features
- 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
Applications
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
Cobham Gaisler provides development tools such as the GRMON software debugger and various compilers and operating systems.
Quad-Core LEON4 Next Generation Microprocessor Development Board
The GR-CPCI-GR740 evaluation board has been designed for evaluation of the Cobham Gaisler GR740 device:
Documentation
| Document | File |
| GR740 Data Sheet and User’s Manual Documentation for GR740-CP, GR740-MP, and flight models. |
GR740-UM-DS.pdf (July 2018) |
| 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 (April 2017) |
| Comparison Between GR740, LEON4-N2X and NGMP | GR740-CMP.pdf (August 2017) |
| GR740 pinout in Excel spreadsheet format | GR740_pinout_rev1-5.xlsx (September 2015) |
| GR740 Technical Note on Benchmarking and Validation | GR740-VALT-0010.pdf (August 2018) |
| GR740 IBIS model | gr740_clga625.ibs (password protected) |
| GR740 PCB Design Package Contains IBIS, BSDL, Package outline assembly drawings, Daisy-chain information |
GR740_PCB_Design_Package.zip (password protected) (August 2017) |
| GR740 Power Calculator Spreadsheet | GR740powercalculator.xlsx (February 2017) |
Other Resources
A socket for use with prototype devices is available from Ironwood Electronics. The part number is C14992.