Automotive
its Ferri storage products, all of which are available in versions qualifi ed to AEC-Q100 Grades 3 and 2.
Controller technology extends data retention
As Figure 2 shows, the acceleration of electron leakage from NAND Flash memory cells at high temperatures dramatically shortens data retention, down to as little as two days at 85°C for an MLC cell which has undergone its rated maximum number of P/E cycles. The Silicon Motion solution is to monitor the voltage at every cell in an array to detect those in which leakage has progressed to a critical state, and then to reprogram at-risk cells. The Ferri product feature which implements this technology, IntelligentScan + DataRefresh, can extend NAND Flash array lifetimes far beyond the nominal P/E cycle lifetime specifi ed by the Flash manufacturer (see Figure 3). The intelligence in the IntelligentScan feature also includes responding automatically to temperature, and scanning more frequently when operating at high temperature.
When a cell’s oxide layer has degraded so much that it can no longer be suffi ciently
recharged, the IntelligentScan function will repair it if possible, or retire it, thus avoiding any risk to data integrity.
The controller in Ferri products also implements advanced global wear levelling, so that P/E operations, and thus wear, are evenly allocated across an entire array.
Confi guring NAND Flash cells for optimized operation
The controller embedded in Silicon Motion AEC-Q100 qualifi ed storage devices also provides the capability for the user to confi gure operation of TLC NAND Flash to extend data integrity. The SLCMode function available in Ferri products virtually groups together TLC or MLC cells into a one-bit SLC-like confi guration. This is ideal for use cases in which the nominal storage capacity (in TLC mode) is over-specifi ed. Operation with the SLCMode feature turned on reduces the nominal capacity, but gives SLC-like data retention and data integrity performance. Ferri products offer MLCmode operation as well as SLCmode, giving users the ability to choose the ideal balance between data integrity and capacity for their application. In addition, they provide an SSDLifeGuard feature
which automatically monitors the health status of the SSD, and triggers the controller to implement data protection and error correction operations when blocks or pages are at risk.
Extending NAND cell operation beyond ten years AEC-Q100 qualifi cation for automotive storage devices calls for zero-defect performance at high temperature – a very challenging requirement for NAND Flash- based devices, because of the acceleration in data leakage from NAND cells at high temperatures of 85°C and above. The fact that Silicon Motion’s Ferri products are qualifi ed for automotive use at temperatures up to 105°C is testament to the effectiveness of the unique technologies, such as IntelligentScan + DataRefresh, which Silicon Motion has developed for managing NAND Flash arrays.
The optimization of storage products for automotive applications results from Silicon Motion’s commitment to the automotive market – a commitment which is also demonstrated by its compliance with the full range of automotive industry standards,
including IATF 16949, ASPICE, and VDA 6.3. Automotive manufacturers can also take
confi dence from Silicon Motion’s leadership position in the market for merchant SSD controllers and embedded storage devices. Silicon Motion is the leading specialist manufacturer of NAND Flash controller technology and can draw on more than 20 years’ experience in developing specialized processor ICs which manage NAND components. In the past ten years, Silicon Motion has shipped more than six billion NAND Flash controllers, more than any other company in the world.
So now automotive manufacturers can embed robust solid-state storage into infotainment and ADAS ECUs with confi dence that Silicon Motion’s Ferri products’ lifetime, data integrity and data retention will meet users’ expectations for vehicle lifetimes of ten years and beyond.
https://www.siliconmotion.com
References 1
IHS Markit report cited at:
https://www.eenewsautomotive.com/news/ number-automotive-ecus-continues-rise
The CEC173x Real-Time PRoT Controller Upgrade Your Platform Security with “Trust Shield”
The CEC173x family “Trust Shield” controller is an advanced Root of Trust (RoT) technology that establishes cyber resiliency and end-to-end chain of trust. Using this solution, a platform’s security can be strengthened with Secure Boot/Updates, Real-Time System Bus Protection, Device Identity Verification, and Side-channel Attack Countermeasures.
Key Features • Real-Time SPI Bus Monitoring • Hardware 384-bit Physically Unclonable Function (PUF) • Device and Firmware Attestation • Lifecycle Management and Ownership Transfer • Hardware Cryptographic Cipher Suite
microchip.com/trustshield 16 November 2022 Components in Electronics
The Microchip name and logo and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. All other trademarks are the property of their registered owners. © 2022 Microchip Technology Inc. All rights reserved. MEC2430A-UK-06-22
www.cieonline.co.uk
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