Communication series P3 : AMBA AXI in Verilog

Explore the AXI stream interface and its five channels for master–slave data transfer, with address/control, data, write and read channels, and t last and t user signals for packet delimitation.

Explore axi stream fundamentals with valid, tdata, tready, and tlast; compare three master-slave transactions, explaining no address transfer, backpressure handling, and data hold when tready is low.

Explore building ips around an axi stream interface, starting with a round robin arbiter in Verilog and then adding an extra stream interface and an axi fifo common in Ethernet.

Explore a Verilog round robin arbiter for AMBA AXI, testing grant one and grant two with single and dual requests, reset sequencing, and alternating grants to share resources fairly.

Design an axis arbiter that selects between two input axis slave interfaces and forwards transactions to a single axis master, using fixed priority and a shared clock and ready/valid handshake.

Explore two axis fifo approaches: wait for t ready before t valid, and push data when valid, using a 16-depth, 8-bit memory with write/read pointers, keep/last flags, and full/empty logic.

Demonstrate implementing and testing an axis fifo in verilog using a 20 ns clock, reset sequencing, and random stimuli to verify write and read with tdata, tvalid, and tready.

Learn how channel IDs uniquely tag AXI transactions in single-bit no-pipeline and pipeline modes. Identify how IDs enable matching responses to their transactions even when data arrives out of order.

Explore the write response channel: master and slave use be ready, be valid, be ID, and be response, with bid matching aw id and bresp indicating ok after last transfer.

Explore AXI lite signals for write and read transactions, including master–slave handshakes on address, data, and response channels with clock and active-low reset.

Explore four AXI configurations: single bit without pipeline, single bit with pipeline, burst without pipeline, and burst with pipeline, with address, data, and response phases, and their typical applications.

Explore single beat without pipeline in a master and slave AMBA AXI configuration, focusing on w valid, w ready, w address, w data, and be valid, be response signaling.

Implement a non pipelined amba axi i/o port transaction in verilog, detailing address phase, write address, write data, and write response channels, master/slave handshakes, 32-bit lanes, and synchronous active-low reset.

Implement a write-only axil master in verilog, initializing w data and w strobe to zero, driving input data on write channels and holding it until w valid and w ready.

Implement a write-only axil slave by sampling w_valid data, updating a 32-bit memory of 16 locations when address is in range, and issuing proper b channel responses or errors.

build and simulate a verilog amba axi write channel testbench to verify ten random master–slave write transactions, including address and data, with wvalid/wready and bvalid/bready handshakes and memory range checks.

Implement Verilog AXI lite master to initiate write and read operations with a slave via txi, drive an FSM, and exchange 32-bit addresses and data through all channels with timeouts.

Implement a read transaction flow for AMBA AXI in Verilog by sending the read address, waiting for valid data, sampling on the data bus, and using rlast with timeout logic.

Implement a Verilog AMBA AXI master write channel, detailing write address and data paths, burst handling, and waiting for the write response.

Conclude the module by examining burst modes in Verilog, building a master and slave that support burst modes, and implementing next-address prediction to enable your own axi ip.

Learn wrap mode in amba axi verilog, computing wrap boundaries from starting address, burst length, and byte size, and apply modulus-based wrapping to cyclic addresses.

Explore implementing a slave write in AMBA AXI using a sleeve module that predicts next-bit addresses, manages burst modes, and coordinates memory read/write via a finite state machine.