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 Advanced Micro Devices, Inc. (AMD) is an American multinational semiconductor company based in Santa Clara, California, that develops computer processors and related technologies for business and consumer markets. While it initially manufactur ...

ARM In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint (shoulder joint) and the elbow joint. The distal part of the upper limb between the ...

Huawei Huawei Technologies Co., Ltd. ( ; ) is a Chinese multinational technology corporation headquartered in Shenzhen, Guangdong, China. It designs, develops, produces and sells telecommunications equipment, consumer electronics and various smar ...

Mellanox Technologies Mellanox Technologies Ltd. ( he, מלאנוקס טכנולוגיות בע"מ) was an Israeli-American multinational supplier of computer networking products based on InfiniBand and Ethernet technology. Mellanox offered adapters, switches, softwa ...

Qualcomm Qualcomm () is an American multinational corporation headquartered in San Diego, California, and incorporated in Delaware. It creates semiconductors, software, and services related to wireless technology. It owns patents critical to the 5G, 4 ...

and

Xilinx Xilinx, Inc. ( ) was an American technology and semiconductor company that primarily supplied programmable logic devices. The company was known for inventing the first commercially viable field-programmable gate array (FPGA) and creating the fi ...

. Quotes from the homepage: * ''The mission of the CCIX Consortium is to develop and promote adoption of an

industry standard ''Industry Standard'' is the sixth studio album by the Dixie Dregs, released in 1982. This was the second of two albums released under the moniker The Dregs, and is their only album featuring vocals (by Alex Ligertwood of Santana and Patrick Si ...

specification to enable coherent interconnect technologies between general-purpose processors and acceleration devices for efficient heterogeneous computing.'' * ''The CCIX standard is available to member companies with initial products expected in 2017.''

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

Compute Express Link Compute Express Link (CXL) is an open standard for high-speed central processing unit (CPU)-to-device and CPU-to-memory connections, designed for high performance data center computers. CXL is built on the PCI Express (PCIe) physical and electr ...

(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

Epyc Epyc is a brand of multi-core x86-64 microprocessors designed and sold by AMD, based on the company's Zen microarchitecture. Introduced in June 2017, they are specifically targeted for the server and embedded system markets. Epyc processors share t ...

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

, many do not support the use of CCIX in practice, as it has not been fully validated.

References

External links

CCIX consortium

CCIX page at wikichip.org
{{Computer-bus Computer hardware standards Computer buses