LEON3FT-RTAX Fault-tolerant Processor
Notice
The LEON3FT-RTAX has been discontinued. Existing customer are recommended to contact sales@gaisler.com to place repeat orders only.
For new designs, customers are recommended to use the GR712RC Dual-Core LEON3FT Mircoprocessoro or the GR716 LEON3FT Microcontroller.
Introduction
The LEON3FT-RTAX processor is a SOC design based on LEON3FT core, implemented in the RTAX2000S radiation-tolerant FPGA. The processor is delivered as a programmed and tested RTAX2000S device, with several package and quality options. The combination of the RTAX2000S radiation-tolerance and the fault-tolerant capabilities of LEON3FT makes LEON3FT-RTAX suitable for any space application. To validate the fault-tolerance properties of the LEON3FT-RTAX design, a heavy-ion error-injection test campaign was carried in November 2005. The test was fully successful and confirmed the suitability of the LEON3FT-RTAX processor for critical space applications.
LEON3FT-RTAX functionality
In addition to the LEON3FT core, the LEON3FT-RTAX includes a number of application-specific IP cores. Several pre-define configurations are available to address different application requirements. All configurations have the same basic architecture, which includes the following functions:
- LEON3FT processor with 8+4 kbyte cache
- LEON3 Debug Support Unit
- PROM/SRAM controller with EDAC
- Interrupt controller for 15 interrupts
- Timer module with two 32-bit timers and watchdog
- Two UARTs with FIFO
- 16-bit I/O port
The configurations are differentiated according to the following table:
| Configuration | FPU |
MMU | SDRAM | SpaceWire | 1553 | CAN | Ethernet | PCI |
| LEON3FT-RTAX-IC1 | yes | - | - | - | 1 RT | 1 | - | - |
| LEON3FT-RTAX-IC2 | yes | - | - | 2 | - | - | - | - |
| LEON3FT-RTAX-SC1 | yes | - | - | - | 1 BRM | - | - | - |
| LEON3FT-RTAX-SC2 | - | - | yes | 3 | - | - | - | - |
| LEON3FT-RTAX-SC3 | - | yes | yes | 2 | - | 1 | - | - |
| LEON3FT-RTAX-SC4 | - | yes | yes | - | - | - | 1 | yes |
| LEON3FT-RTAX-PC1 | yes | - | yes | 2 | - | - | - | - |
| LEON3FT-RTAX-PC2 | yes | - | yes | - | - | - | 2 | - |
Performance and power
The configurations can be clocked up to 25 MHz over the full military temperature range (except LEON3FT-RTAX-IC1 and LEON3FT-RTAX-SC1 that are fixed to 24 MHz). This provides upto 20 DMIPS and 4 MFLOPS in configurations with an FPU. The power consumption depends on the application, and is typically 0.5 W at full processor load. In power-down mode, the processor power consumption is ~ 0.3 W.
Custom configurations
In addition to the pre-defined configurations, it is possible to order LEON3FT-RTAX devices with custom configurations. Such configuration can also include IP core from the GRLIB IP library which are not listed above. An NRE cost will be charged for the development of each custom configuration.
Packaging, quality and lead time
The LEON3FT-RTAX devices are shipped as pre-programmed and tested parts in all quality levels supported by Microchip. Supported packages are CQFP352 and CCGA624.