Compute Express Link: The Breakthrough CPU-to-Device Interconnect

About CXL™

Compute Express Link™ (CXL™) is a new high-speed CPU-to-Device and CPU-to-Memory interconnect designed to accelerate next-generation data center performance. CXL technology maintains memory coherency between the CPU memory space and memory on attached devices, which allows resource sharing for higher performance, reduced software stack complexity, and lower overall system cost. This permits users to simply focus on target workloads as opposed to the redundant memory management hardware in their accelerators. 

CXL is designed to be an industry open standard interface for high-speed communications, as accelerators are increasingly used to complement CPUs in support of emerging applications such as Artificial Intelligence and Machine Learning.

CXL Specification 1.1 Available Now to Members 

The CXL Specification 1.1 enables a high-speed, efficient interconnect between the CPU and platform enhancements and workload accelerators, such as GPUs, FPGAs and other purpose-built accelerator solutions. The technology is built upon the well-established PCI Express® (PCIe®) infrastructure, leveraging the PCIe 5.0 physical and electrical interface to provide advanced protocol in three key areas:

  • I/O Protocol 

  • Memory Protocol, initially allowing a host to share memory with an accelerator

  • Coherency Interface

The specification is available to companies that Join CXL.

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