AMBA AXI4 PROTOCOL PDF

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AMBA AXI specifies many optional signals , which can be optionally included depending on the specific requirements of the design, [2] making AXI a versatile bus for numerous applications. While the communication over an AXI bus is between a single master and a single slave, the specification includes detailed description and signals to include N:M interconnects, able to extend the bus to topologies with more masters and slaves. Thread IDs allow a single master port to support multiple threads, where each thread has in-order access to the AXI address space, however each thread ID initiated from a single master port may complete out of order with respect to each other.

For instance in the case where one thread ID is blocked by a slow peripheral, another thread ID may continue Independent of the order of the first thread ID. Another example, one thread on a cpu may be assigned a thread ID for a particular master port memory access such as read Addr1, write addr1, read addr1, and this sequence will complete in order because each transaction has the same master port thread ID. Thread IDs on a master port are not globally defined, thus an AXI switch with multiple master ports will internally prefix the master port index to the thread ID, and provide this concatenated thread ID to the slave device, then on return of the transaction to its master port of origin, this thread ID prefix will be used to located the master port and the prefix will be truncated.

This is why the slave port thread ID is wider in bits than the master port thread ID. This bus is typically used for an end point that only needs to communicate with a single master device at a time, example, a simple peripheral such as a UART. In contrast, a CPU is capable of mastering to multiple peripherals and address spaces at a time, and will support more than one thread ID on its axi master ports and axi slave ports.

This is why a CPU will typically support a full spec axi bus. A typical example of an front side axi switch would include a full spec axi master connected to a cpu master, and several axi-lite slaves connected to the axi switch from different peripheral devices. Additional, axi-lite bus is restricted to only support transaction lengths of 1 data word per transaction. Similarly, the xREADY signal is driven by the receiving entity to notify that it is prepared to receive data.

Thanks to this handshake mechanism, both the source and the destination can control the flow of data, throttling the speed if needed. In the AXI specification, five channels are described: [7].

AXI is a burst-based protocol , [11] meaning that there may be multiple data transfers or beats for a single request. This makes it useful in the cases where it is necessary to transfer large amount of data from or to a specific pattern of addresses. This is useful for repeated access at the same memory location, such as when reading or writing a FIFO. In INCR bursts, on the other hand, each beat has an address equal to the previous one plus the transfer size.

This burst type is commonly used to read or write consequential memory areas. However, with WRAP bursts, if the address of the current beat reaches the "Higher Address boundary", it is reset to the "Wrap boundary":.

Additionally, the other auxiliary signals, if present, are used to define more specific transfers. To start a write operation, the master has to provide both the address information and the data ones. The address information are provided over the Write address channel, in a similar manner as a read operation:. A master has also to provide the data related to the specified address es on the Write data channel:.

After the completion of both the transactions, the slave has to send back to the master the status of the write over the Write response channel, by returning the result over the BRESP signal. From Wikipedia, the free encyclopedia. Transactions on the same master port that have the same thread ID must be completed in order. Additionally, different master ports may be completed out of order with respect to each other.

This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. Arm Holdings. Retrieved 5 July Xilinx Inc. Technical and de facto standards for wired computer buses. PC Card ExpressCard. Interfaces are listed by their speed in the roughly ascending order, so the interface at the end of each section should be the fastest. Categories : Computer buses System on a chip.

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Address ID, to identify multiple streams over a single channel. AWLEN [nb 1]. ARLEN [nb 1]. Lock type, to provide atomic operations. Quality of Service of the transaction. AWQOS [nb 2]. ARQOS [nb 2]. Data ID, to identify multiple streams over a single channel. WID [nb 3].

WUSER [nb 2]. RUSER [nb 2]. Write response ID, to identify multiple streams over a single channel. BUSER [nb 2].

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Advanced Microcontroller Bus Architecture

It facilitates development of multi-processor designs with large numbers of controllers and components with a bus architecture. Since its inception, the scope of AMBA has, despite its name, gone far beyond microcontroller devices. These protocols are today the de facto standard for embedded processor bus architectures because they are well documented and can be used without royalties. An important aspect of an SoC is not only which components or blocks it houses, but also how they interconnect. AMBA is a solution for the blocks to interface with each other. The AMBA specification defines an on-chip communications standard for designing high-performance embedded microcontrollers. It is supported by ARM Limited with wide cross-industry participation.

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Advanced eXtensible Interface

AMBA AXI specifies many optional signals , which can be optionally included depending on the specific requirements of the design, [2] making AXI a versatile bus for numerous applications. While the communication over an AXI bus is between a single master and a single slave, the specification includes detailed description and signals to include N:M interconnects, able to extend the bus to topologies with more masters and slaves. Thread IDs allow a single master port to support multiple threads, where each thread has in-order access to the AXI address space, however each thread ID initiated from a single master port may complete out of order with respect to each other. For instance in the case where one thread ID is blocked by a slow peripheral, another thread ID may continue Independent of the order of the first thread ID. Another example, one thread on a cpu may be assigned a thread ID for a particular master port memory access such as read Addr1, write addr1, read addr1, and this sequence will complete in order because each transaction has the same master port thread ID. Thread IDs on a master port are not globally defined, thus an AXI switch with multiple master ports will internally prefix the master port index to the thread ID, and provide this concatenated thread ID to the slave device, then on return of the transaction to its master port of origin, this thread ID prefix will be used to located the master port and the prefix will be truncated. This is why the slave port thread ID is wider in bits than the master port thread ID.

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AMBA AXI4 Interface Protocol

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