GR716: LEON3 mixed-signal rad-hard microcontroller

The GR716 is a radiation hardened mixed-signal microcontroller with fault-tolerant features. It is available in two versions, the GR716A and the GR716B. The former has already been extensively tested for electrical and radiation performance, and flight parts are currently available. The latter, based on the GR716A design, is being developed to provide higher computational performance, support for more interfaces, enhanced analog functions, support for switching power applications, and functionality to support the use of commercial off the shelf (COTS) FPGAs in space. The GR716B is currently under development, with prototypes expected to be available in Q1 2024. This paper provides an overview of the architecture of both devices and focuses on the additional features and functionalities offered by the GR716B microcontroller.