The Next Generation Mass Memory Unit (MMU-NXT), developed with funding from ESA’s General Support Technology Programme (GSTP), is a high-performance onboard data storage system designed for future space missions requiring increased storage capacity and data throughput. Aimed at exceeding the capabilities of current mass memory units, MMU-NXT features a modular architecture with two cold-redundant halves. It is comprised of the Mass Memory Module (MMM) and Command and Control Module (CCM).

At the core of MMU-NXT are advanced technologies including the Versal AI Core ACAP XQRVC1902, which acts as a high-speed NAND flash controller and interface hub, and the Microchip RTG4 FPGA, responsible for managing SpaceWire routing and monitoring of the Versal device. A LEON3FT Soft-IP processor provides onboard command and control managed by the CCM.

The system supports up to 53 Tibit (BOL) of non-volatile NAND storage and incorporates 8 GiBytes of DDR4 memory (gross) as a data buffer. It achieves a maximum aggregated data rate of 20 Gbps, with SpaceWire operating up to 200 Mbps and SpaceFibre links supporting up to 6.25 Gbps data signaling rate. Interfaces include multiple SpaceWire and SpaceFibre ports for instrument data and downlink, a WizardLink interface for data input, and a redundant SpaceWire link for command and control and time synchronization.

By integrating state-of-the-art FPGAs and high-speed data links, MMU-NXT will offer a significant advancement in mass memory unit performance, making it a key enabler for data-intensive space applications.

The Biomass Payload Data Handling Unit (PDHU) is an integral component designed to support complex data operations in space missions. It manages a complete spectrum of data functions, including acquisition, compression, storage, encryption, and downlink. The PDHU is equipped with advanced, flash-based storage technology that is optimized for the harsh conditions of space, providing reliable error detection and correction capabilities. Its modular design allows for flexible customization of storage capacities and interface options to suit specific mission requirements.

The unit supports a variety of high-performance interfaces such as SpaceWire and WizardLink, catering to diverse payload, control, and monitoring needs. It operates efficiently, with power consumption kept below 12 watts during active downlink or recording modes, ensuring energy efficiency in space operations. With customizable storage options ranging from 1 Tbit to 16 Tbit at end of life and data downlink capabilities up to 1 Gbps, the PDHU is tailored for high-speed, reliable data handling. Furthermore, its robust, radiation-tolerant design and capability to function across a wide temperature range make it an indispensable tool for managing data in the challenging environment of space. This unit's adaptability and performance are crucial for ensuring the successful management and security of data on space missions.

The HERA satellite's Payload Data Handling Unit (PDHU) features a Mass Memory Unit that is adept at managing large volumes of data, essential for space missions. The unit boasts a write and read performance of up to 10 Mbps via SpaceWire connections, ensuring efficient data handling capabilities. It offers a substantial storage capacity of 486 Gbit (EOL), accommodating extensive data collection over time. The PDHU interfaces include three SpaceWire connections for payloads and a redundant (1N + 1R) interface for the onboard computer (OBC), emphasizing reliability in data transactions.

The EnMAP satellite is equipped with a sophisticated DPU, made by DSI. This system features a storage capacity of 512 Gbit and utilizes the CCSDS 122.0-B-1 standard for efficient image data compression. Additionally, it supports advanced CCSDS services, enabling high-speed image data downloads at rates up to 320 Mbit/s. This technology ensures effective data management and quick data retrieval essential for the satellite’s earth observation tasks.

The EnMAP satellite's on-board Instrument Control and Processing Unit (ICPU) is central to managing and optimizing the satellite's operations. It efficiently processes the incoming hyperspectral image data, manages the control of the satellite's scientific instruments, and seamlessly interfaces with the data storage module. This integration ensures robust handling of data from acquisition through to storage, facilitating the swift and accurate delivery of Earth observation insights.