Magnetoresistive RAM manufacturer Everspin has announced their first MRAM-based storage products and issued two other press releases about recent accomplishments. Until now, Everspin's business model has been to sell discrete MRAM components, but they're introducing a NVMe SSD based on their MRAM. Everspin's MRAM is one of the highest-performing and most durable non-volatile memory technologies on the market today, but its density and capacity falls far short of NAND flash, 3D XPoint, and even DRAM. As a result, use of MRAM has largely been confined to embedded systems and industrial computing that need consistent performance and high reliability, but have very modest capacity requirements. MRAM has also seen some use as a non-volatile cache or configuration memory in some storage array controllers. The new nvNITRO family of MRAM drives is intended to be used as a storage accelerator: a high-IOPS low-latency write cache or transaction log, with performance exceeding that of any single-controller drive based on NAND flash.

Everspin's current generation of spin-torque MRAM has a capacity of 256Mb per die with a DDR3 interface (albeit with very different timings from JEDEC standard for DRAM). The initial nvNITRO products will use 32 or 64 MRAM chips to offer capacities of 1GB or 2GB on a PCIe 3 x8 card. MRAM has high enough endurance that the nvNITRO does not need to perform any wear leveling, which allows for a drastically simpler controller design and means performance does not degrade over time or as the drive is filled up—the nvNITRO does not need any large spare area or overprovisioning. Read and write performance are also nearly identical, while flash memory suffers from much slower writes than reads, which forces flash-based SSDs to buffer and combine writes in order to offer good performance. Everspin did not have complete performance specifications available at time of writing, but the numbers they did offer are very impressive: 6µs overall latency for 4kB transfers (compared to 20µs for the Intel SSD DC P3700), and 1.5M IOPS (4kB) at QD32 (compared to 1.2M IOPS read/200k IOPS write for the HGST Ultrastar SN260). The nvNITRO does rely somewhat on higher queue depths to deliver full performance, but it is still able to deliver over 1M IOPS at QD16, around 800k IOPS at QD8, and QD1 performance is around 175k IOPS read/150k IOPS write. MRAM supports fine-grained access, so the nvNITRO performs well even with small transfer sizes: Everspin has hit 2.2M IOPS for 512B transfers, although that is not an official performance specification or measurement from the final product.

As part of today's announcements, Everspin is introducing MRAM support for Xilinx UltraScale FPGAs in the form of scripts for Xilinx's Memory Interface Generator tool. This will allow customers to integrate MRAM into their designs as easily as they would use SDRAM or SRAM. The nvNITRO drives are a demonstration of this capability, as the SSD controller is implemented on a Xilinx FPGA. The FPGA provides the PCIe upstream link as a standard feature, the memory controller is Everspin's new and Everspin has developed a custom NVMe implementation to take advantage of the low latency and simple management afforded by MRAM. Everspin claims a 30% performance advantage over an unspecified NVRAM drive based on battery-backed DRAM, and attributes it primarily to their lightweight NVMe protocol implementation. In addition to NVMe, the nvNITRO can be configured to allow all or part of the memory to be directly accessible for memory-mapped IO, bypassing the protocol overhead of NVMe.



The initial version of the nvNITRO is built with an off-the-shelf FPGA development board and mounts the MRAM on a pair of SO-DIMMs. Later this year Everspin will introduce new denser versions on a custom PCIe card, as well as M.2 drives and 2.5" U.2 using a 15mm height to accommodate two stacked PCBs. By the end of the year, Everspin will be shipping their next generation 1Gb ST-MRAM with a DDR4 interface, and the nvNITRO will use that to expand to capacities of up to 16GB in the PCIe half-height half-length card form factor, 8GB in 2.5" U.2, and at least 512MB for M.2.

Everspin has not announced pricing for the nvNITRO products. The first generation nvNITRO products are currently sampling to select customers and will be for sale in the second quarter of this year, primarily through storage vendors and system integrators as a pre-installed option.

New Design Win For Current MRAM

Everspin is also announcing another design win for their older field-switched MRAM technology. JAG Jakob Ltd is adopting Everspin's 16Mb MRAM parts for their PdiCS process control systems, with MRAM serving as both working memory and code storage. These systems have extremely strict uptime requirements, hard realtime performance requirements and service lifetimes of up to 20 years; there are very few memory technologies on the market that can satisfy all of those requirements. Everspin will continue to develop their line of MRAM devices that compete against SRAM and NOR flash even as their higher-capacity offerings adopt DRAM-like interfaces.

Source: Everspin

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  • BrokenCrayons - Wednesday, March 8, 2017 - link

    There's a 99.99% chance that your 99.99% number is not supported by facts. :)
  • Spunjji - Wednesday, March 8, 2017 - link

    It kinda is, though. MRAM technology is not going to offer sufficient density to replace those products - certainly not affordably. The replacement will need to come from somewhere else.
  • Tchamber - Wednesday, March 8, 2017 - link

    I wouldn't be so fast to ignore this. SSDs have been in use since the 70s and took decades to make it to the consumer level. In 1977 Micro Memory had an SSD with 8KB for $650. It's OK if they start out small, they might have the next big thing...who knows.
  • BrokenCrayons - Thursday, March 9, 2017 - link

    Of course there's a chance MRAM will never develop or is physically impossible to develop into a replacement for NAND storage. I can't see how there won't be significant technical hurdles and, even if the engineering issues can be overcome, there are still financial and market forces to contend with that can stop a superior technology from surviving (Amiga anyone?). Being positive and upbeat is not akin to being foolish or unrealistic so don't mistake my excitement and interest as not being grounded with a healthy dose of realism.
  • ddriver - Wednesday, March 8, 2017 - link

    Oh yeah? The last 10 years there have been news of "revolutionary new battery technology" what would completely destroy li-ion in terms of capacity, safety, endurance and weight, at least 2-3 times annually. Yet 10 years later, we still use li-ion. With the slight difference that it now explodes more than ever.

    As for MRAM, it is intrinsically crippled by its operational principle. It will never really catch up on say nand, even long after nand has hit the brickwall of process scaling. Ways to fabricate high density MRAM exist, however it would be astronomically expensive and very, very slow.

    There is a bell shaped curve for everything, and it has only one peak. Sometimes technology just can't get any better, and often it is already good enough. Take car batteries for example. They were lead-acid for decades, and they will be lead-acid in a 100 years, provided there are still people around, and they have fuel to drive cars with.

    The facts are out there, for those who do not wish to be ignorant. It is not my job to educate, especially not the ineducable.
  • BrokenCrayons - Thursday, March 9, 2017 - link

    I'm still not seeing any support for this 99.99% claim you're making. As for the development of new products that make it to's clear that you don't understand how a (relatively) free global market works with respect to R&D and innovation. Despite this lack of understanding, you insist on making grand, sweeping claims about how things should be in an attempt to prop up your own false idea of your mental superiority. There's no need to be like that and it's pretty clear that you feel so insecure about yourself that you can't help but take every possible baited hook you find in an on-going series of attempts to aggressively reassure yourself that your misguided feelings about your intellect are true. We've gone down this road before where I've found it necessary to give you a bit of a spanking and I think it'd be prudent of you realize you're diving into another pissing contest with a skunk. Backing off now might validate you aren't quite the foolish fish you've made yourself into up to this point.
  • BurntMyBacon - Thursday, March 9, 2017 - link

    @ddriver: "Oh yeah? The last 10 years there have been news of "revolutionary new battery technology" what would completely destroy li-ion in terms of capacity, safety, endurance and weight, at least 2-3 times annually. Yet 10 years later, we still use li-ion."

    Putting aside other technologies still spinning up, we already have AgZn. Silver Zinc has higher energy density than Lithium-Ion, it is more environmentally friendly (95% of raw materials are recyclable), it has a better safety record (no runaway thermals, no FAA restrictions), and is (wait for it ...) already used in Europe (and apparently in U.S. military application for a while now). Lithium-Ion is just cheaper (Lithium is much more abundant) so it won't likely disappear. This is the same situation that has resulted in apparent popularity of Alkaline. Better choices exist, but the markets they are found in will always be defined by the cost to produce.
  • wumpus - Thursday, March 9, 2017 - link

    This one somehow made it to production and shipped. That puts it so far beyond nearly all competing technologies that it isn't funny. It also gives it a lifeline to R&D to give it a chance to keep up with NAND flash, DRAM, 3xpoint, etc.

    Once it shipped, the 99.9% number wasn't even close anymore. But I can't claim that it is a good bet, just not a[n almost] sure loss like any non-shipping competing tech.
  • fanofanand - Wednesday, March 15, 2017 - link

    You are absolutely right! It's just like those darned energy companies that are holding back the engine which can run on only water! Those corporate corporatists, just always looking to make money and hold back progress! Ugh I feel so exploited now.
  • londedoganet - Wednesday, March 8, 2017 - link

    My mind instantly goes to American football player Saggitariutt Jefferspin when I see the name of the company. Also the toy top manufacturer Foreverspin.

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