AJEET SBC with Xilinx V5 FPGA

The AJEET board combines the processing functions and the I/O necessary for a complete spacecraft C&DH system on a single 3U board. The AJEET uses the rad-hard BRE440 system-on-a-chip (SoC) and the rad-hard Virtex-5QV FPGA. The board includes the following resources:


  • Radiation-Hardened BRE440 SoC PowerPC Processor @100MHz Core Frequency
  • Radiation-Hardened Xilinx Virtex-5QV FPGA
  • 512Mbytes Double Data Rate (DDR) SDRAM System Memory (EDAC)
  • 128Kbytes Boot EEPROM (TMR)
  • Up to 8Gbyte FLASH Memory (TMR) with independent switched power
  • 256Mbytes Digital Signal Processing (DSP) SDRAM (EDAC/Reed-Solomon capable)
  • PCI V2.2, 32/64-bit, 33/66 MHz, configurable for cPCI system slot or peripheral slot operation; Initiator and target operation
  • Mass: 460g, Power: 11.7W, TID: 50KRad
  • Qty 24 RS422 or LVDS inputs
  • Qty 24 RS422 or LVDS outputs
  • Qty 2 RS485 transceivers
  • Qty 1 LVDS DeSerializers (3:21)
  • Qty 16 Bi-Level inputs (TTL/CMOS), 5V or 3.3V
  • Qty 80 Analogs (+/-10V) / AD590 Temps (16 can be PRTs) with 14 AD590 voltage excitations
  • Qty 12 Sun Sensors with 3 Sun Sensor Current Excitations
  • Support for 10/100 Mbps RMII Ethernet (Requires 3 LVDS TX, 4 LVDS RX)
  • Support for SpaceWire Interfaces (Requires 2 LVDS TX, 2 LVDS RX per interface)
Feature AJEET Capability Comment
IBM PPC 440 core with FPU, 100MHz Core Frequency
VxWorks 6.7 BRE-Boot BSP Included
L1 (Data and Instruction) cache
32Kbyte each
L2 Cache
4 Channels
2 Channels, RMII (10/100)
LVDS Buffers. Interface unit for ground testing can be purchased as an option.
2 Channels
RS422 Buffers
33MHz, 32 bit cPCI Interface
Boot Code Storage
128Kbytes EEPROM
Triple Module Redundant (TMR)
SW Code Storage
1GKbytes Flash
Triple Module Redundant (TMR)
System Memory
512Mbytes DDR
EDAC protected
DSP and I/O Memory
256Mbytes SDRAM
EDAC protected/Reed-Solomon capable. Can be used for Xilinx data processing
User Defined FPGA resource
Rad-Hard Xilinx Virtex-5 (SIRF)
On-Orbit reprogrammable
High Speed data interface
1 LVDS DESER (3:21) interface
Up to 800Mbps data transfer link
User Defined digital I/O
2 RS485 buffers
Connected to Xilinx FPGA for flexibility
User Defined digital I/O

24 RS422/LVDS TX and

24 RS422/LVDS RX

Connected to Xilinx FPGA for flexibility.  Additional Ethernet interfaces are supported (each requires 3 LVDS TX, 4 LVDS RX)

SpaceWire interfaces are supported (each requires 2 LVDS TX, 2 LVDS RX) Note: Some of these RS422 buffers are used for UART and Ethernet interfaces.

User Defined discrete signals
16 TTL/CMOS Inputs
Discrete to monitor relay etc., status
User Defined Analog I/O

80 Analogs / AD590 Temps,

12 Sun Sensors for SOH

Up to 16 AD590 inputs can be configured for PRTs. Analog I/Os are on AJEET daughter board that can be removed if not required.