Is AXI a protocol?
The AXI protocol defines the signals and timing of the point-to-point connections between manager and subordinates. Note: The AXI protocol is a point-to-point specification, not a bus specification. Therefore, it describes only the signals and timing between interfaces.
What is AXI Lite protocol?
AXI4-Lite is a subset of the AXI4 protocol intended for communication with simpler, smaller control register-style interfaces in components. The key features of the AXI4-Lite interfaces are: All transactions have a burst length of one. All data accesses are the same size as the width of the data bus.
What is QoS AXI?
The AMBA 4 AXI protocol brings in quality of service (QoS) signaling on the AXI bus to address the challenges imposed by bandwidth and latency requirements of various IP in a SoC.
How do you use AXI protocol?
The procedure for the AXI protocol is as follows:
- Master & slave must “handshake” to confirm valid signals.
- Transmission of control signal must be in separate phases.
- Separate channels for transmission of signals.
- Continuous transfer may be accomplished through burst-type communication.
What are AXI channels?
AXI provides response signaling for both read and write transactions. For read transactions, the response information from the subordinate is signaled on the read data channel using RRESP. For write transactions, the response information is signaled on the write response channel using BRESP.
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.
What is exclusive okay in AXI?
Exclusive Access – The Concept All other accesses, including exclusive fail accesses, receive an OKAY response. The exclusive access mechanism enables the implementation of semaphore type operations without requiring the bus to remain locked to a particular master for the duration of the operation.
What is AXI interface used for?
AXI interconnects allow multiple masters and/or multiple slaves to interface with each other. The AXI specification defines the interface between a master and slave, a master and interconnect, and a slave and interconnect.
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 interleaving in AXI protocol?
Write data interleaving enables a slave interface to accept interleaved write data with different AWID values. The slave declares a write data interleaving depth that indicates if the interface can accept interleaved write data from sources with different AWID values.
What is wrap boundary in AXI?
The wrap boundary is the size of each transfer in the burst multiplied by the total number of transfers in the burst. Two restrictions apply to wrapping bursts: the start address must be aligned to the size of the transfer. the length of the burst must be 2, 4, 8, or 16.