Cache coherent interconnect for accelerators
The cache coherent interconnect for accelerators (CCIX) protocol is the result of an effort of a joint group of computer, hardware and software component vendors: AMD, ARM, Huawei, Mellanox Technologies, Qualcomm and Xilinx. Quotes from the homepage: Current Status. As of 2021, the future of CCIX as widely used interface to attach accelerators to servers in a cache-coherent fashion is doubtful. Many of the original members of the CCIX Consortium have instead opted to support the competing CXL standard, originally developed by Intel but then opened up, for the same purpose. This has led  to processors originally announced with CCIX support, such as the AMD Epyc 7002, never actually shipping with that feature enabled. On the side of servers with ARM processors that also list CCIX in their specifications, such as the TaiShan 200 series from Huawei, many do not support the use of CCIX in practice, as it has not been fully validated.