Advanced eXtensible Interface

The Advanced eXtensible Interface (AXI) is an on-chip communication bus protocol and is part of the Advanced Microcontroller Bus Architecture specification (AMBA).^[1]^[2] AXI had been introduced in 2003 with the AMBA3 specification. In 2010, a new revision of AMBA, AMBA4, defined the AXI4, AXI4-Lite and AXI4-Stream protocols. AXI is royalty-free and its specification is freely available from ARM.

AMBA AXI specifies many optional signals, which can be included depending on the specific requirements of the design,^[3] making AXI a versatile bus for numerous applications.

While the communication over an AXI bus is between a single initiator and a single target, the specification includes detailed descriptions and signals to include N:M interconnects, able to extend the bus to topologies with multiple initiators and targets.^[4]

AMBA AXI4, AXI4-Lite and AXI4-Stream have been adopted by Xilinx and many of its partners as a main communication bus in their products.^[5]^[6]

^ "AMBA | Documentation". Arm Holdings.
^ Toole, Christina (24 October 2016). "Introduction to AXI Protocol: Understanding the AXI interface". arm.com. Arm Limited. Retrieved 11 September 2023. The protocol used by many SoC designers today is AXI, or Advanced eXtensible Interface, and is part of the Arm Advanced Microcontroller Bus Architecture (AMBA) specification. It is especially prevalent in Xilinx's Zynq devices, providing the interface between the processing system and programmable logic sections of the chip.
^ Arm Holdings. "AMBA AXI and ACE Protocol Specification" (PDF). developer.arm.com. pp. 109–118. Archived from the original (PDF) on 5 July 2019. Retrieved 5 July 2019.
^ Arm Holdings. "AMBA AXI and ACE Protocol Specification" (PDF). developer.arm.com. pp. 23–24. Archived from the original (PDF) on 5 July 2019. Retrieved 5 July 2019.
^ "AMBA AXI4 Interface Protocol". www.xilinx.com. Xilinx Inc.
^ "AXI4 IP". www.xilinx.com. Xilinx Inc.

[1] "AMBA | Documentation". Arm Holdings.

[ARM-AXI-Protocol_(2016)-2] Toole, Christina (24 October 2016). "Introduction to AXI Protocol: Understanding the AXI interface". arm.com. Arm Limited. Retrieved 11 September 2023. The protocol used by many SoC designers today is AXI, or Advanced eXtensible Interface, and is part of the Arm Advanced Microcontroller Bus Architecture (AMBA) specification. It is especially prevalent in Xilinx's Zynq devices, providing the interface between the processing system and programmable logic sections of the chip.

[3] Arm Holdings. "AMBA AXI and ACE Protocol Specification" (PDF). developer.arm.com. pp. 109–118. Archived from the original (PDF) on 5 July 2019. Retrieved 5 July 2019.

[4] Arm Holdings. "AMBA AXI and ACE Protocol Specification" (PDF). developer.arm.com. pp. 23–24. Archived from the original (PDF) on 5 July 2019. Retrieved 5 July 2019.

[5] "AMBA AXI4 Interface Protocol". www.xilinx.com. Xilinx Inc.

[6] "AXI4 IP". www.xilinx.com. Xilinx Inc.

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