Macronix supports automotive system needs with high-density LybraFlash

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The combination of Internet of Things (IoT), high-speed 5G communication and artificial intelligence (AI) technologies has given rise to a diversity of applications for embedded systems such as automotive electronics and factory automation equipment. For example, rapid advances in autonomous driving and Internet of Vehicles (IoV) have significantly reshaped the automotive market. Advanced Driver Assistant Systems (ADAS) and digital instrument clusters include features that bring entirely new driving experiences to consumers. These are enabled by a myriad of software implementations that play an instrumental role.

The demand for large-capacity nonvolatile memory (NVM) used to store software code grows with the increase in the complexity and scale of system application programs. Flash memory devices with more than one Gigabit (Gb) capacities, therefore, become increasingly important, and memory device makers' planning of large-capacity memory products plays a pivotal role helping them expand their market footprint.

With years of experience in developing memory solutions for automotive electronics and factory automation equipment, particularly automotive flash memory, leading NVM provider Macronix has made its way into the supply chain of the world's top automakers. Macronix's solutions are being used in subsystems produced by the 10 largest tier-1 suppliers, which includes the growing electric car segment. Its high-density memory product mix now includes five major lines: octaflash, SPI NOR, LybraFlash, SPI NAND (ECC Free) and SPI NAND (host-based ECC). Tailored to suit all types of system application requirements, these Macronix solutions help tier-1 suppliers quickly gain ground in the market.

LybraFlas - striking a balance between all critical requirements

The automotive memory market will see an array of innovative memory solutions emerge to address the challenges facing traditional NOR flash in capacity expansion and market competition. According to Psyche Kuo, deputy director of product marketing at Macronix, automotive electronics manufacturers consider five key factors when choosing flash memory: cost-effectiveness, reliability, usability, access speed and write speed.

Limitations in semiconductor manufacturing processes as technology nodes shrink, make capacity expansion for traditional NOR flash cost ineffective. Macronix's innovative LybraFlash intelligently works around these limitations. Aside from enabling cost-effectiveness, I/O performance is another highlight of LybraFlash. An automotive system requires a large amount of program code to be retrieved from flash to system RAM for execution. Although the I/O performance of LybraFlash may not be on par with the industry's fastest NOR flash, like octaflash - it comes close to that of traditional Quad Serial NOR. Furthermore, in the case of a system glitch, data need to be logged quickly, so fast write speeds are essential. LybraFlash enables very fast write, a feature that particularly catches automotive electronics manufacturers' attention, said Kuo. Because automotive systems attach great importance to safety functions, key parameters must be quickly recorded when a system failure occurs for tracking and analytical purposes afterwards. Featuring four times faster write speeds compared to traditional NOR flash, LybraFlash satisfies customers' needs and wins their favor. Last but not least, LybraFlash is built in with the industry's most robust 8-bit (or 12-bit) ECC for serial flash and error status checking, as Macronix considers reliability a top priority for automotive electronics. The integration of innovative memory products in any device requires a certain level of design customization in the end device. To use LybraFlash, customers only need to make small modifications to their software code, which is much easier than incorporating most other advanced memory products.

In practice, automotive electronics manufacturers decide on the suitable serial flash to use in consideration of their target application. For example, a full display cluster requires larger flash capacities now than before. Although NOR flash, such as high-density octaflash NOR, provides compelling reliability and access speeds, LybraFlash is an ideal match to automotive market segments that highlight affordability and mid-range specifications, and thus consider cost-effectiveness a major requirement. Apart from striking a strong balance between capacity and access speed, LybraFlash also delivers far superior fast write speed over traditional NOR flash. In general, LybraFlash's benefits can be harnessed through simple code changes; enable a good balance of capacity, cost and performance; and boost the competitive edge of automotive products.

Delivering user experience comparable to NOR flash, LybraFlash presents an ideal choice for automotive systems

When an automotive system boots up, a large amount of program code is retrieved from flash to system RAM for execution. This is a process where application software plays no role so the flash device must operate in a NOR access mode or something similar. Because LybraFlash is able to operate in an access mode similar to NOR, there is no need to change the automotive system's hardware design, therefore only small modifications to system software are needed. Operating in a continuous access mode similar to NOR and built in with a bad-block link table, LybraFlash delivers a user experience comparable to NOR flash.

With respect to error-correcting capabilities critical to memory products' life cycle, LybraFlash is designed with outstanding 8- or 12-bit ECC to significantly reduce errors. On top of that, LybraFlash provides the flexibility for users to configure the Flexible ECC Bit Flip Threshold Setting, for example, setting as 6 to 12-bits; thus, the data is only moved after correction to avoid excessive data moves and to prolong the flash's lifespan.

Macronix makes LybraFlash available in 1Gb/2Gb/4Gb capacities, as well as 3V and 1.8V voltages. As an extension to Macronix's NOR flash line, LybraFlash not only meets a specific range of I/O performance and data refresh needs, but also offers large capacities that conventional NOR products rarely achieve. Mainly used in automotive systems such as ADAS and instrument clusters, LybraFlash is undergoing rigorous AEC-Q100 certifications to present the automotive market with an ideal solution combining large-capacity, high-I/O throughput, long lifespan, and optimal reliability. This high reliability feature also makes it well suited for factory automation applications. Sampling of the first-generation LybraFlash MX31 series began in January 2020 for customers' initial design verification. Macronix will continue to expand its high-density memory offerings, aggressively targeting new application markets led by automotive electronics and factory automation equipment.

For more product information, please visit the Macronix website.

Psyche Kuo, deputy director of Product Marketing, Macronix

Psyche Kuo, deputy director of Product Marketing, Macronix

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