What is AMBA AXI protocol?
The AXI is a point to point interconnect that designed for high performance, high speed microcontroller systems. The AXI protocol is based on a point to point interconnect to avoid bus sharing and therefore allow higher bandwidth and lower latency. AXI is arguably the most popular of all AMBA interface interconnect.
What is the difference between AMBA and AXI?
However if the SoC is large, has multiple clock domains, or if a subsystem is large and has multiple clock domains and the demand for throughput and bandwidths are high, the frequency of clock are higher e.g. 200+ MHz, then AXI is the way to go….
| AHB | AXI |
|---|---|
| No QoS Support | AXI 4 supports QoS |
What is AXI3?
The Advanced eXtensible Interface (AXI), part of the ARM Advanced Microcontroller Bus Architecture 3 (AXI3) and 4 (AXI4) specifications, is a parallel high-performance, synchronous, high-frequency, multi-master, multi-slave communication interface, mainly designed for on-chip communication.
What is exclusive okay in AXI?
[AXI Exclusive Access] Simply put Exclusive accesses are a sequence of read transactions followed by write transactions to the same address range. Successful exclusive accesses receive an EXOKAY response. All other accesses, including exclusive fail accesses, receive an OKAY response.
What is AXI ID width?
The slave ID width is equal to the master ID width plus the LOG2 of the number masters ports of the interconnect. The AXI protocol requires this width in order to allow correct routing of the response back to the master.
Where is AXI protocol used?
The protocol used by many SoC 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.
What is 1k boundary in AHB?
1 kilobyte is the smallest area an AHB slave may occupy in the memory map. Therefore,if a burst did cross a 1 kilobyte boundary, the access could start accessing one slave at the beginning of the burst and then switch to another on the boundary, which must not happen for the above reason.
What is the AXI capability of data interleaving?
By interleaving the two write data streams, the interconnect can improve system performance. Each AXI channel transfers information in only one direction, and there is no requirement for a fixed relationship between the various channels.
What is AXI beat?
A ‘beat’ is an individual data transfer within an AXI burst. An AXI ‘burst’ is a transaction in which multiple data items are transferred based upon a single address, and it is each data item transferred that is referred to as a ‘beat’.
What is exclusive transfer in AMBA?
Simply put Exclusive accesses are a sequence of read transactions followed by write transactions to the same address range. Successful exclusive accesses receive an EXOKAY response. All other accesses, including exclusive fail accesses, receive an OKAY response.
What is an exclusive access?
Exclusive Access system grants selected members early access to upcoming releases. According to a press release, “Exclusive Access may be delivered before the general launch, after the general launch, or delivered in absence of a general launch – some drops may release only via Exclusive Access.”
How many channels are there in AXI?
five channels
The AXI protocol defines five channels: three for write signals, and two for read signals.
How is AXI stream protocol used in AMBA 4?
*Download AMBA 4 AXI4-Stream Protocol Spec document here (Source: arm). AXI Stream protocol is used to transfer the data from one device to another, or from Master device to the Slave device. Master is the main initiator of the data transfer and Slave is the main receiver.
When did the AXI micro controller bus come out?
AXI is part of ARM AMBA, a fami ly of micro controller buses first introduced in 1996. The first version of AXI was first included in AMBA 3.0, released in 2003. AMBA 4.0, released in 2010, includes the second version of AXI, AXI4.
Why is the AXI protocol important for data transfer?
The AXI protocol also ensures an efficient, flexible, and predictable means for transferring data. About Data Interpretation. The AXI protocol does not specify or enforce th e interpretation of data; therefore, the data contents must be understood, and the different IP must have a compatible interpretation of the data.
Which is AXI interconnect IP Contai NS compliant?
The Xilinx AXI Interconnect IP contai ns AXI-compliant master and slave interfaces, and can be used to route transactions between one or more AXI masters and slaves. The AXI Interconnect IP is described in Xilinx AXI Interconnect Core IP, page 19.