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Silicon Motion’s Ferri Family Optimizes Embedded Flash-based Storage for Automotive Use
T
he automotive industry is transforming at lightning speed with the rise of connected vehicles. In recent years, the concept of the digital cockpit has been proposed, including integrated dashboard, navigation, audio, and video, and higher transmission rates and a higher-end transmission system and larger storage will be required at this time. The automotive storage solutions transitioned from RAW NAND, SD, eMMC to UFS. In the near future, PCIe SSDs with native SR-IOV support will become the mainstream.
For the automotive market, the considerations of performance and price have to be balanced with the need for ultra-high quality and reliability.
Silicon Motion satisfies this requirement through a combination of: • Strict quality criteria
Strict criteria are applied to the specification of the controller and NAND dies used in Ferri family products. The die selection is made only from high-yield wafers drawn from mature (rather than leading-edge) production processes, by which stage all defects and quality issues have normally been well characterized and so can readily be detected. This means that the production process for the Ferri family products starts with known-good dies.
In addition, every part of the Ferri family supply chain, from the foundry which fabricates the controller to the factory which sorts the wafers to the test and validation facility to Silicon Motion itself is all certified for IATF 16949.
considerations for system designers. For users of automotive storage devices, this calls for close evaluation of two parameters: endurance, and data integrity Silicon Motion addresses the issue of endurance through the implementation of sophisticated global wear levelling technology in its NAND controller.
In addition, it features advanced technology for prolonging data retention, including: • Static Data Refresh and Early Retirement
The effect of these and other lifespan operations is to achieve an endurance rating of 3,000 Program/Erase cycles, surpassing the benchmark typically set by the automotive industry for IVI storage applications.
Data integrity is ensured through the application of error correction technology superior to that typically used in consumer NAND devices. Equipped with Silicon Motion’s proprietary NANDXtend® ECC technology by using an LDPC code and a Group page RAID algorithm, Silicon Motion’s automotive storage solutions extend the service life of SSD.
Silicon Motion also implements Enhanced Write Protection which offers permanent, temporary and power-on protection options. Special procedures to protect data in the event of unexpected power loss – a relatively common occurrence in the automotive environment – ensure that data that is being written as power goes down is safely stored before the Ferri family device powers down.
Automotive traceability requirements are fully supported – for instance, the Ferri family device’s controller die includes a unique chip ID stored in one-time programmable memory so that it can be traced back to its original wafer lot and wafer map. The Silicon Motion commitment to automotive quality feeds through all the way to final assembly, which takes place on a fully automated line. Test chambers are used to screen every block in every production unit for defects at an operating temperature specified by the customer. The screening allows Silicon Motion to identify all cells at risk of becoming an early bad block, so that they can be quarantined by the NAND controller before shipment to the customer.
• High data integrity and reliability In the automotive environment, reliability and a long operating lifespan are core
Silicon Motion’s automotive storage solutions satisfy the strict requirements of automotive system designs. With SR-IOV support, full end-to-end data path protection and extended temperature support, the Silicon Motion automotive storage solutions provide high reliability and data integrity. Silicon Motion offers flexible longevity support to guarantee long-term availability. Silicon Motion automotive storage solutions are qualified to AEC-Q100 and ASPICE. In addition, Silicon Motion supports the automotive grade products with a FMEDA to facilitate automotive manufacturers’ compliance with the ISO 26262 functional safety standard.
Silicon Motion’s Ferri Family storage solutions are particularly well adapted to the needs of the automotive market, providing a combination of long-term reliable operation, data integrity and data retention to ensure that the solid-state memory matches the quality and reliability of any other electronics system in a vehicle.
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Components in Electronics
EIA Supplement 2021 27
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