AXI-STREAM Protocol

Jan 9, 2024#FPGA29

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The AXI-STREAM protocol is a simple and efficient data transfer protocol used for high-throughput data streaming. It is lighter and simpler than the traditional AXI bus, and is suitable for applications that require high-speed data transfer. The protocol uses handshake signals like TVALID and TREADY for transfers, and organizes data into packets and frames. The interface signals include ACLK (global clock), ARSTn (global reset), TVALID (valid data from the host), TREADY (ready to receive data), TDATA (data width in multiples of bytes), TLAST (indicates packet boundaries), and TID (identity identifier for multiple data streams). The data transfer starts when both TVALID and TREADY are high on the rising edge of the clock. The AXI-STREAM protocol eliminates the need for address transmission, reducing propagation delay.

Introduction to AXI-STREAM#

Concept#

AXI-Stream bus is an efficient and simple data transfer protocol, mainly used for high-throughput data streaming scenarios. Compared to traditional AXI bus, AXI-Stream bus is simpler and lighter. It transfers data from one module to another without the need for addresses, making it suitable for applications that require high-speed data transfer.

Partial Terminology#

Transfer: Transfer based on the TVALID and TREADY handshake protocol
Packet: A group of data transmitted through axi-stream
Frame: The largest byte combination, containing an integer number of packets

Interface Signals#

Signal	Description
ACLK	Global clock signal, rising edge effective
ARSTn	Global reset signal, active low
TVALID	Valid data driven by the host
TREADY	The slave can receive data
TDATA[(8n-1):0]	Bit width is a multiple of bytes
TLAST	Indicates the boundary of the data packet
TID	Identity identifier issued by the host, which works when there are multiple stream data transfers, used to identify different data streams

Data transmission starts when both TVALID and TREADY are high on the rising edge of clk.

Since AXI-STREAM does not require address transmission and only performs simple sending and receiving, it reduces propagation delay.