LEON3FT-RTAX Fault-tolerant Processor
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 Actel. Supported packages are
CQFP352 and CCGA624. For prices and lead times, contact
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Projects
LEON3FT-RTAX has been flown on the Indian Chandrayaan-1 mission, and will be used on the Taiwanese
ARGO and the the Swedish
PRISMA missions. It has also been integrated in the
TDP8 instrument on Alphasat/Alphabus.
