CCIX Protocol Push PCI Express 4.0 up to 25G

By SemiWiki

June 9, 2017

The CCIX consortium has developed the Cache Coherent Interconnect for Accelerators (X) protocol. The goal is to support cache coherency, allowing faster and more efficient sharing of memory between processors and accelerators, while utilizing PCIe 4.0 as transport layer. With Ethernet, PCI Express is certainly the most popular protocol in existing server ecosystems, in-memory database processing or networking, pushing to select PCIe 4.0 as transport layer for CCIX.

But PCIe 4.0 is defined by the PCI-SIG to run up to 16Gbps only, so the CCIX consortium has defined extended speed modes up to 25Gbps (2.5Gbps, 8Gbps, 16Gbps, 25Gbps). The goal is to allow multiple processor architectures with different instruction sets to seamlessly share data in a cache coherent manner with existing interconnects, boosted up to 25Gbps to fulfill the bandwidth needs of tomorrow applications, like big data analytics, search machine learning, network functions virtualizations (NFV), video analytics, wireless 4G/5G, and more.

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