Kioxia Demos CXL Devices with XL-Flash, BiCS 3D NAND

Kioxia CXL + BiCS Flash
(Image credit: KIOXIA America, Inc. via Twitter)

The Compute Express Link technology allows for building various devices to address a vast array of workloads, from expanding memory subsystem capacity and performance to offering ultra-fast persistent storage. Being one of the world's leading makers of NAND memory, Kioxia can address the latter. Recently, it demonstrated its 3D NAND and XL-Flash-based CXL solutions at the Flash Memory Summit 2023, as reported by ServeTheHome

Kioxia revealed plans to offer two lineups of its CXL products: CXL + XL-Flash-based devices for performance and reliability-centric applications such as in-memory databases and AI inference workloads, as well as CXL + BiCS 3D NAND-powered devices for capacity-hungry applications like Big Data and AI training. In both cases, storage devices use a special controller and CXL.mem protocol for reading and CXL.io protocol for writing to minimize respective latencies.

Kioxia's proprietary 1st Generation XL-Flash is essentially single-level cell (SLC) NAND spread over 16 planes, whereas 2nd Generation XL-Flash is multi-level cell (MLC) flash memory spread over a higher number of planes, which by definition offers lower latency and higher parallelism for read/write operations, thus guaranteeing massively higher performance compares to mainstream 3D TLC NAND. 

Anton Shilov
Contributing Writer

Anton Shilov is a contributing writer at Tom’s Hardware. Over the past couple of decades, he has covered everything from CPUs and GPUs to supercomputers and from modern process technologies and latest fab tools to high-tech industry trends.

  • Li Ken-un
    Kioxia's proprietary 1st Generation XL-Flash is essentially single-level cell (SLC) NAND spread over 16 planes, whereas 2nd Generation XL-Flash is multi-level cell (MLC) flash memory spread over a higher number of planes, which by definition offers lower latency and higher parallelism for read/write operations
    I’d assume the intention was to state that the MLC version would still offer lower latency despite the move from SLC to MLC?

    I understand how more planes improve parallelism, but how does that improve latency?
    Reply
  • thestryker
    The performance on XL-Flash was the closest anything has come to matching Optane, but it didn't really appear in many devices. I'm really curious how MLC based is going to compare as it shouldn't be anywhere near as good. If it turns out to be close to as good as the SLC version was I hope it gets more market penetration.
    Reply