GR716A - LEON3FT Microcontroller


The GR716A features a fault-tolerant LEON3 SPARC V8 processor, communication interfaces and on-chip ADC, DAC, Power-on-Reset, Oscillator, Brown-out detection, LVDS transceivers, regulators to support for single 3.3V supply, ideally suited for space and other high-rel applications. The GR716A is supported by a software development environment described below.

GR716 block diagram


  • System frequency up-to 50 MHz
  • SpaceWire links up-to 100 Mbps
  • CQFP132 hermetically sealed ceramic package
  • Total Ionizing Dose (TID) up to 300 krad (Si, functional)
  • Single-Event Latch-Up (SEL) to LETTH > 118 MeV-cm2mg
  • Single-Event Upset (SEU) below 7E-6 event/device/day in typical space orbits
  • Support for single 3.3V supply


  • Fault-tolerant SPARC V8 processor with 31 register windows 
      • 16-bit instruction set: LEON-REX for improved code density
      • Double precision IEEE-754 floating point unit
      • Memory protection units with 8 zones and individual access control of peripherals
      • Deterministic software execution and non-intrusive debugging
      • Fast context switching (PWRPSR, AWP, register partitioning, interrupt mapping, SVT, MVT) 
      • Interrupt zero jitter delay
      • Non-intrusive advanced on-chip debug support unit with trace buffers and statistics
  • External EDAC memory: 8-bit PROM/SRAM, SPI, I2C
  • SpaceWire interface with time distribution support, 100 Mbps
  • MIL-STD-1553B interface
  • 2x CAN 2.0B controller interface
  • PacketWire with CRC acceleration support
  • Programmable PWM interface
  • SPI with SPI-for-Space protocols
  • UARTs, I2C, GPIO, Timers with Watchdog
  • Interrupt controller, Status registers, etc.
  • Dual ADC 11bits @ 200Ksps, 4 differential or 8 single ended
  • DAC 12bits @ 3Msps, 4 channels
  • Mixed General purpose inputs and outputs
  • Power-on-Reset and Brown-out-detection
  • Temperature sensor, Integrated PLL
  • On-chip regulator for 3.3V single supply

Integrated Analog functions

  • Dual 11 bits 200KS/s SAR ADC with Pre-amplifier
  • 12 bit 3.75MS/s Rad Hardened DAC
  • Rad Hardened PLL
  • Crystal Oscillator
  • Power On System Reset
  • 1.8V and 3.3V voltage monitors
  • GPIO with local Power on Control
  • LVDS transceivers with build-in reference
  • Rad Hardened voltage and current reference
  • Rad Hardened Low-drop regulators for single supply support
  • Rad Hardened external voltage references
  • Rad Hardened high density RAM with EDAC protection

Memory support

  • 192KiB EDAC protected tightly coupled memory with single cycle access from processor and ATOMIC bit operations
  • Embedded ROM with bootloader for initializing and remote access
  • Dedicated SPI Memory interface with boot ROM capability
  • I2C memory interface with boot ROM capability
  • 8-bit SRAM/ROM I/F with support up to 16MiB ROM and 256MiB SRAM
  • Scrubber with programmable scrub rate for all embedded memories and external PROM/SRAM and SPI memories
  • Redundant boot memory (PROM/SRAM/SPI/I2C/NVRAM)
  • Application software container for checking software integrity using CRC
  • Boot from internal SRAM, external PROM/FLASH/SRAM/SPI/I2C memory


Support for many different standard interfaces makes the GR716A microcontroller ideally fit for handling supervision and control tasks in a satellite, such as

  • propulsion system control
  • sensor bus control
  • robotics applications control
  • simple motor control
  • mechanism control
  • power control
  • particle detector instrumentation
  • radiation environment monitoring
  • thermal control
  • antenna pointing control
  • remote terminal unit control
  • simple instrument control

Software Development Environment (SDE)

We provide compiler toolchains and development tools with GR716A specific support such as the GR716A BSPs, GRMON support and simulator CPU/IO models. The Bare-metal environment is free and open-source. The GR716-MINI board can be evaluated using the free GRMON3 evaluation version.

Our SDE for the GR716 consists of the following software components from:


Flight parts of the GR716A are available. The qualifications status for such parts is:

  • Qualification tests as per PCA defined by ESCC Basic Specification No. 2567000
  • Screening tests as per ESCC 9000

Detailed ordering information is described in the GR716-DS-UM.


Document Link
GR716 Data Sheet and User’s Manual GR716-DS-UM.pdf (November 2022)
GR716A Product Brief GR716A Product Brief.pdf (May 2023)
Comparison Between GR716A and GR716B GR716B-COMP-1-1-1-Comparison_between_GR716A_and_GR716B.pdf (May 2023)
GR716 Software Evaluation board GR716-MINI
GR716 Hardware Engineering board GR716-BOARD
GR716 Interface Development board GR-CPCI-GR716-DEV