For more information and updates: http://alexforencich.com/wiki/en/verilog/axi/start
GitHub repository: https://github.com/alexforencich/verilog-axi
Collection of AXI4 and AXI4 lite bus components. Most components are fully parametrizable in interface widths. Includes full MyHDL testbench with intelligent bus cosimulation endpoints.
AXI width adapter module with parametrizable data and address interface widths. Supports INCR burst types and narrow bursts. Wrapper for axi_adapter_rd and axi_adapter_wr.
AXI width adapter module with parametrizable data and address interface widths. Supports INCR burst types and narrow bursts.
AXI width adapter module with parametrizable data and address interface widths. Supports INCR burst types and narrow bursts.
AXI to AXI DMA engine with parametrizable data and address interface widths. Generates full-width INCR bursts only, with parametrizable maximum burst length. Supports unaligned transfers, which can be disabled via parameter to save on resource consumption.
Descriptor multiplexer/demultiplexer for AXI CDMA module. Enables sharing the AXI CDMA module between multiple request sources, interleaving requests and distributing responses.
AXI nonblocking crossbar interconnect with parametrizable data and address interface widths and master and slave interface counts. Supports all burst types. Fully nonblocking with completely separate read and write paths; ID based transaction ordering protection logic; and per-port address decode, admission control, and decode error handling. Wrapper for axi_crossbar_rd and axi_crossbar_wr.
Address decode and admission control module for AXI nonblocking crossbar interconnect.
AXI nonblocking crossbar interconnect with parametrizable data and address interface widths and master and slave interface counts. Read interface only. Supports all burst types. Fully nonblocking with completely separate read and write paths; ID based transaction ordering protection logic; and per-port address decode, admission control, and decode error handling.
AXI nonblocking crossbar interconnect with parametrizable data and address interface widths and master and slave interface counts. Write interface only. Supports all burst types. Fully nonblocking with completely separate read and write paths; ID based transaction ordering protection logic; and per-port address decode, admission control, and decode error handling.
AXI to AXI stream DMA engine with parametrizable data and address interface widths. Generates full-width INCR bursts only, with parametrizable maximum burst length. Supportts unaligned transfers, which can be disabled via parameter to save on resource consumption. Wrapper for axi_dma_rd and axi_dma_wr.
Descriptor multiplexer/demultiplexer for AXI DMA module. Enables sharing the AXI DMA module between multiple request sources, interleaving requests and distributing responses.
AXI to AXI stream DMA engine with parametrizable data and address interface widths. Generates full-width INCR bursts only, with parametrizable maximum burst length. Supportts unaligned transfers, which can be disabled via parameter to save on resource consumption.
AXI stream to AXI DMA engine with parametrizable data and address interface widths. Generates full-width INCR bursts only, with parametrizable maximum burst length. Supportts unaligned transfers, which can be disabled via parameter to save on resource consumption.
AXI FIFO with parametrizable data and address interface widths. Supports all burst types. Optionally can delay the address channel until either the write data is completely shifted into the FIFO or the read data FIFO has enough capacity to fit the whole burst. Wrapper for axi_fifo_rd and axi_fifo_wr.
AXI FIFO with parametrizable data and address interface widths. AR and R channels only. Supports all burst types. Optionally can delay the address channel until either the read data FIFO is empty or has enough capacity to fit the whole burst.
AXI FIFO with parametrizable data and address interface widths. WR, W, and B channels only. Supports all burst types. Optionally can delay the address channel until the write data is shifted completely into the write data FIFO, or the current burst completely fills the write data FIFO.
AXI shared interconnect with parametrizable data and address interface widths and master and slave interface counts. Supports all burst types. Small in area, but does not support concurrent operations.
AXI RAM with parametrizable data and address interface widths. Supports FIXED and INCR burst types as well as narrow bursts.
AXI register with parametrizable data and address interface widths. Supports all burst types. Inserts simple buffers or skid buffers into all channels. Channel register types can be individually changed or bypassed. Wrapper for axi_register_rd and axi_register_wr.
AXI register with parametrizable data and address interface widths. AR and R channels only. Supports all burst types. Inserts simple buffers or skid buffers into all channels. Channel register types can be individually changed or bypassed.
AXI register with parametrizable data and address interface widths. WR, W, and B channels only. Supports all burst types. Inserts simple buffers or skid buffers into all channels. Channel register types can be individually changed or bypassed.
AXI lite width adapter module with parametrizable data and address interface widths. Wrapper for axi_adapter_rd and axi_adapter_wr.
AXI lite width adapter module with parametrizable data and address interface widths.
AXI lite width adapter module with parametrizable data and address interface widths.
AXI lite shared interconnect with parametrizable data and address interface widths and master and slave interface counts. Small in area, but does not support concurrent operations.
AXI lite RAM with parametrizable data and address interface widths.
AXI lite register with parametrizable data and address interface widths. Inserts skid buffers into all channels. Channel registers can be individually bypassed. Wrapper for axil_register_rd and axil_register_wr.
AXI lite register with parametrizable data and address interface widths. AR and R channels only. Inserts simple buffers into all channels. Channel registers can be individually bypassed.
AXI lite register with parametrizable data and address interface widths. WR, W, and B channels only. Inserts simple buffers into all channels. Channel registers can be individually bypassed.
awid : Write address ID
awaddr : Write address
awlen : Write burst length
awsize : Write burst size
awburst : Write burst type
awlock : Write locking
awcache : Write cache handling
awprot : Write protection level
awqos : Write QoS setting
awregion : Write region
awuser : Write user sideband signal
awvalid : Write address valid
awready : Write address ready (from slave)
wdata : Write data
wstrb : Write data strobe (byte select)
wlast : Write data last transfer in burst
wuser : Write data user sideband signal
wvalid : Write data valid
wready : Write data ready (from slave)
bid : Write response ID
bresp : Write response
buser : Write response user sideband signal
bvalid : Write response valid
bready : Write response ready (from master)
arid : Read address ID
araddr : Read address
arlen : Read burst length
arsize : Read burst size
arburst : Read burst type
arlock : Read locking
arcache : Read cache handling
arprot : Read protection level
arqos : Read QoS setting
arregion : Read region
aruser : Read user sideband signal
arvalid : Read address valid
arready : Read address ready (from slave)
rid : Read data ID
rdata : Read data
rresp : Read response
rlast : Read data last transfer in burst
ruser : Read data user sideband signal
rvalid : Read response valid
rready : Read response ready (from master)
ADDR_WIDTH : width of awaddr and araddr signals
DATA_WIDTH : width of wdata and rdata signals
STRB_WIDTH : width of wstrb signal
ID_WIDTH : width of *id signals
AWUSER_ENABLE : enable awuser signal
AWUSER_WIDTH : width of awuser signal
WUSER_ENABLE : enable wuser signal
WUSER_WIDTH : width of wuser signal
BUSER_ENABLE : enable buser signal
BUSER_WIDTH : width of buser signal
ARUSER_ENABLE : enable aruser signal
ARUSER_WIDTH : width of aruser signal
RUSER_ENABLE : enable ruser signal
RUSER_WIDTH : width of ruser signal
rtl/arbiter.v : Parametrizable arbiter
rtl/axi_adapter.v : AXI lite width converter
rtl/axi_adapter_rd.v : AXI lite width converter (read)
rtl/axi_adapter_wr.v : AXI lite width converter (write)
rtl/axi_cdma.v : AXI central DMA engine
rtl/axi_cdma_desc_mux.v : AXI CDMA descriptor mux
rtl/axi_crossbar.v : AXI nonblocking crossbar interconnect
rtl/axi_crossbar_addr.v : AXI crossbar address module
rtl/axi_crossbar_rd.v : AXI crossbar read module
rtl/axi_crossbar_wr.v : AXI crossbar write module
rtl/axi_dma.v : AXI DMA engine
rtl/axi_dma_desc_mux.v : AXI DMA descriptor mux
rtl/axi_dma_rd.v : AXI DMA engine (read)
rtl/axi_dma_wr.v : AXI DMA engine (write)
rtl/axi_fifo.v : AXI FIFO
rtl/axi_fifo_rd.v : AXI FIFO (read)
rtl/axi_fifo_wr.v : AXI FIFO (write)
rtl/axi_interconnect.v : AXI shared interconnect
rtl/axi_ram.v : AXI RAM
rtl/axi_register.v : AXI register
rtl/axi_register_rd.v : AXI register (read)
rtl/axi_register_wr.v : AXI register (write)
rtl/axil_adapter.v : AXI lite width converter
rtl/axil_adapter_rd.v : AXI lite width converter (read)
rtl/axil_adapter_wr.v : AXI lite width converter (write)
rtl/axil_interconnect.v : AXI lite shared interconnect
rtl/axil_ram.v : AXI lite RAM
rtl/axil_register.v : AXI lite register
rtl/axil_register_rd.v : AXI lite register (read)
rtl/axil_register_wr.v : AXI lite register (write)
rtl/priority_encoder.v : Parametrizable priority encoder
Write
___ ___ ___ ___ ___
clk ___/ \___/ \___/ \___/ \___/ \___
_______
awid XXXX_ID____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
awaddr XXXX_ADDR__XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
awlen XXXX_00____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
awsize XXXX_0_____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
awburst XXXX_0_____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
awprot XXXX_PROT__XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
awvalid ___/ \_______________________________
___________ _______________________
awready \_______/
_______________
wdata XXXX_DATA__________XXXXXXXXXXXXXXXXXXXXXXXX
_______________
wstrb XXXX_STRB__________XXXXXXXXXXXXXXXXXXXXXXXX
_______________
wvalid ___/ \_______________________
_______
wready ___________/ \_______________________
_______
bid XXXXXXXXXXXXXXXXXXXXXXXXXXXX_ID____XXXXXXXX
_______
bresp XXXXXXXXXXXXXXXXXXXXXXXXXXXX_RESP__XXXXXXXX
_______
bvalid ___________________________/ \_______
___________________________________________
bready
Read
___ ___ ___ ___ ___
clk ___/ \___/ \___/ \___/ \___/ \___
_______
arid XXXX_ID____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
araddr XXXX_ADDR__XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
arlen XXXX_00____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
arsize XXXX_0_____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
arburst XXXX_0_____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
arprot XXXX_PROT__XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______
arvalid ___/ \_______________________________
___________________________________________
arready
_______
rid XXXXXXXXXXXXXXXXXXXXXXXXXXXX_ID____XXXXXXXX
_______
rdata XXXXXXXXXXXXXXXXXXXXXXXXXXXX_DATA__XXXXXXXX
_______
rresp XXXXXXXXXXXXXXXXXXXXXXXXXXXX_RESP__XXXXXXXX
_______
rvalid ___________________________/ \_______
___________________________________________
rready
Running the included testbenches requires MyHDL and Icarus Verilog. Make sure that myhdl.vpi is installed properly for cosimulation to work correctly. The testbenches can be run with a Python test runner like nose or py.test, or the individual test scripts can be run with python directly.
tb/axi.py : MyHDL AXI4 master and memory BFM tb/axil.py : MyHDL AXI4 lite master and memory BFM