CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

Unreleased

0.39.3 - 2024-05-08

Added

• axi_sim_mem: Allow response data for uninitialized region to have configurable defined value.
• axi_test: add clear_memory_regions to axi_rand_master.
• axi_test: Add add_traffic_shaping_with_size to axi_rand_master to allow for traffic shaping with a custom size.

Changed

• axi_pkg: Adjust LatencyMode parameter of xbar_cfg_t to bit vector from xbar_pipeline_e enum to allow custom configurations.

v0.39.3 is fully backward-compatible to v0.39.2.

0.39.2 - 2024-03-13

Added

• axi_interleaved_xbar: An experimental crossbar extension interleaving memory transfers over #334 subordinate devices. Use at your own risk.
• axi_zero_mem: Implementing \dev\zero function for AXI. #334

Fixed

• axi_to_detailed_mem: VCS crashed on default parameters 0, changed them to 1 #334
• axi_to_mem: Add missing testmode pins #327
• axi_sim_mem: Fix byte calculation in R and W forks #331

v0.39.2 is fully backward-compatible to v0.39.1.

0.39.1 - 2023-09-05

Added

• axi_cdc: Add SyncStages parameter.
• axi_to_mem_interleaved: Add interface variant.
• axi_burst_splitter: Expose id_queue's FULL_BW parameter.
• axi_chan_compare: Add parameter to allow reordered transactions.
• Add AXI_HIGHLIGHT macro to highlight AXI signals.
• Add flat port instantiation macros.

Fixed

• axi_test: Avoid false negatives for misaligned reads in axi_scoreboard.
• axi_to_detailed_mem: Ensure proper propagation or err and exokay signals.

0.39.0 - 2023-07-20

Added

• Synthesizable IPs:
  • axi_bus_compare and axi_slave_compare; two synthesizable verification IPs meant to be used to compare two AXI buses on an FPGA.
  • axi_lite_from_mem and axi_from_mem acting like SRAMs making AXI4 requests downstream.
  • axi_lite_dw_converter: Convert the data width of AXI4-Lite transactions. Emits the appropriate amount of downstream transactions to perform the whole requested access.
  • axi_rw_join and axi_rw_split to split/join the read and write channels of an AXI bus.
• CT-macros allowing to instantiate AXI structs with custom channel type names.
• axi_pkg': Add documentation to xbar_cfg_t`.
• Testbench IPs:
  • axi_chan_compare.sv: Non-synthesizable module comparing two AXI channels of the same type
  • Add axi_file_master to axi_test, allowing file-based AXI verification approaches.
  • Add #_width functions to axi_test returning the width of the AXI channels.

Changed

• Synthesizable IPs:
  • axi_demux: Replace FIFO between AW and W channel by a register plus a counter. This prevents AWs from being issued to one master port while Ws from another burst are ongoing to another master port. This is required to prevents deadlocks due to circular waits downstream. Removes FallThrough parameter from axi_demux.
  • Split the axi_demux logic and timing decoupling. A new module called axi_demux_simple contains the core logic.
  • axi_dw_downsizer uses axi_pkg::RESP_EXOKAY as a default value.
  • Simplify the casez in axi_id_remap.
  • Add optional explicit mapping to the axi_id_serialize module.
  • Expand axi_to_mem to axi_to_detailed_mem exposing all of AXI's side-signals; namely id, user, cache, prot, qos, region, atop. Add possibility to inject err and exokay.
  • axi_xbar: Add parameter PipelineStages to axi_pkg::xbar_cfg_t. This adds axi_multicuts in the crossed connections in the xbar between the demuxes and muxes. Improve inline documentation.
  • Move mem_to_banks to common_cells.
• axi_pkg: Improve for better compatibility with Vivado.
• `axi_test:
  • axi_lite_rand_slave: R response field is now randomized.
  • Remove excessive prints from random master and slave.
  • Properly size-align the address.
• axi_pkg: Define localparams to define AXI type widths.
• Update common_cells from version v1.26.0 to v1.27.0.
• Tooling:
  • Use pulp-platform/pulp-actions/gitlab-ci@v2 in the GitHub CI to communicate with the internal CI.
  • Bump DC Shell version from 2019.12 to 2022.03
  • No longer check ModelSim versions 10.7e and 2021.3, add 2022.3.
  • More thorough verification runs for the xbar.
  • Start transitioning from shell script to Makefile to run simulations.
• Use scripts/update_authors to update authors, slight manual fixes performed.

Fixed

• axi_to_mem_banked: Reduce hardware by properly setting UniqueIds.
• axi_to_mem_interleaved and axi_to_mem_split properly instantiates a demultiplexer now. Adds test_i port for DFT.

Breaking Changes

There are breaking changes between v0.38.0 and v0.39.0:

• axi_demux: FallThrough parameter was removed.
• axi_xbar: axi_pkg::xbar_cfg_t added PipelineStages parameter.
• axi_to_mem_interleaved and axi_to_mem_split: Added test_i input port.

0.38.0 - 2022-09-28

Added

• Add axi_dumper and axi_dumper_interpret script to dump log from an AXI bus for debugging purposes.
• Add FuseSoC and Vivado XSIM limited test to CI
• assign.svh: Add macros to assign flat buses using the Vivado naming style.
• axi_lfsr and axi_lite_lfsr: Add AXI4 and AXI4 Lite LFSR Subordinate devices.
• axi_xp: Add crosspoint with homomorphous slave and master ports.

Changed

• Improve compatibility with FuseSoC
• Improve compatibility with Vivado XSIM
• Performance improvements to axi_to_mem
• Use scripts/update_authors to update authors, slight manual fixes performed.

v0.38.0 is fully backward-compatible to v0.36.0 and v0.37.0.

0.37.0 - 2022-08-30

Added

• axi_fifo: Inserts a FIFO into all 5 AXI4 channels; add module and its testbench
• axi_test: Add mapped mode to the random classes as well as additional functionality to the scoreboard class.
• axi_throttle: Add a module that limits the maximum number of outstanding transfers sent to the downstream logic.
• axi_to_mem: AXI4+ATOP slave to control on chip memory.
• axi_to_mem_banked: AXI4+ATOP slave to control on chip memory, with banking support, higher throughput than axi_to_mem.
• axi_to_mem_interleaved: AXI4+ATOP slave to control on chip memory, interleaved to prevent deadlocks.
• axi_to_mem_split: AXI4+ATOP slave to control memory protocol interconnect.
• Bender: Add dependency tech_cells_generic v0.2.2 for generic SRAM macro for simulation.

Changed

• axi_demux: Add module docstring
• axi_sim_mem: Add the capability to emit read and write errors
• Bender: Update dependency common_cells to v1.26.0 from v1.21.0 (required by axi_throttle)
• Remove docs directory, move content to doc folder. docs is automatically created and populated during the CI run.
• Update vsim version to 2021.3 in CI, drop test for 2020.1 and 2021.1

Fixed

• axi_lite_demux: Improve compatibility with vsim version 10.7b.
• axi_lite_mux: Reduce complexity of W channel at master port by removing an unnecessary multiplexer.

v0.37.0 is fully backward-compatible to v0.36.0.

0.36.0 - 2022-07-07

Added

• Add Monitor modport to AXI_BUS, AXI_LITE, and AXI_LITE_DV interfaces.

0.35.3 - 2022-05-03

Fixed

• axi_demux: Eliminate unnecessary stalls of AW channel when the AR channel has reached its maximum number of transactions. Prior to this fix, axi_demux would always stall AWs while read transactions were at their maximum (that is, while MaxTrans read transactions were outstanding). However, this stall is only required when the AW that is being handled by axi_demux is an atomic operation (ATOP) that entails an R response. This fix therefore removes unnecessary stalls as well as an unnecessary dependency between reads and writes. The integrity of data or transactions was not affected by this problem.

0.35.2 - 2022-04-14

Fixed

• axi_lite_mux_intf: Fix type of slv and mst interface ports; they were AXI_BUS instead of AXI_LITE.
• axi_xbar_intf: Fix order of parameters. Prior to this fix, the CONNECTIVITY parameter was defined using the Cfg parameter before the Cfg parameter was defined.
• axi_test::axi_rand_master: Improve compatibility with simulators by changing an implication inside an assertion to a conditional assertion.

0.35.1 - 2022-03-31

Fixed

• axi_demux and axi_lite_demux: Add missing spill registers for configurations with a single master port.
• axi_demux_intf: Add missing parameter (ATOP_SUPPORT) to optionally disable support for atomic operations.
• axi_mux and axi_lite_mux: Add missing spill registers for configurations with a single slave port.
• axi_lite_mux_intf: Add missing parameter values on the internal axi_lite_mux instance (axi_req_t and axi_resp_t).
• axi_sim_mem: Propagate the AR channel's user signal correctly to the monitor.

0.35.0 - 2022-03-11

Added

• axi_sim_mem: Add monitoring interface to observe the point of coherency between the write and the read channel.

Fixed

• axi_sim_mem: Keep R response stable while not accepted.

0.34.0 - 2022-03-09

Added

• axi_demux and axi_isolate: Add parameter AtopSupport to optionally disable the support for atomic operations (ATOPs). This parameter defaults to 1'b1, i.e., ATOPs are supported. Therefore, this change is backward-compatible.
• axi_isolate: Add parameter TerminateTransaction to optionally respond to transactions during isolation. This parameter defaults to 1'b0, i.e., transactions do not get responses. Therefore, this change is backward-compatible.
• axi_xbar: Add Connectivity parameter to enable the implementation of partially-connected crossbars. This parameter defaults to '1, i.e., every slave port is connected to every master port. Therefore, this change is backward-compatible.
• axi_test: Add monitor class axi_monitor.
• axi_test::axi_driver: Add monitor tasks.

Changed

• axi_isolate: Add parameters for the address, data, ID, and user signal width. This is required for the implementation of the TerminateTransaction parameter (see Added section). This change is backward-incompatible for all instances of axi_isolate outside this repository. Users must update all instances of axi_isolate in their code. The interface variant is not affected and remains backward-compatible.

0.33.1 - 2022-02-26

Fixed

• axi_xbar_intf: Add missing ATOPS parameter to optionally disable the support of atomic operations (introduced in v0.25.0 for axi_xbar). The default value of the added parameter makes this fix backward-compatible.

0.33.0 - 2022-02-21

Added

• Add axi_sim_mem_intf interface variant of axi_sim_mem.

Fixed

• axi_cdc: Improve compatibility with VCS by restricting a QuestaSim workaround to be used only for QuestaSim (issue #207).
• axi_id_remap: Improve compatibility with Verilator by excluding asserts for that tool.
• axi_lite_demux: Improve compatibility with VCS (issue #187 reported for axi_demux, which was fixed in v0.29.2).
• axi_xbar: Improve compatibility with VCS by adding VCS-specific code that does not use constant function calls (#208).

0.32.0 - 2022-01-25

Changed

• axi_atop_filter, axi_burst_splitter, axi_cut, axi_delayer, axi_demux, axi_err_slv, axi_isolate, axi_lite_demux, axi_lite_mux, axi_lite_to_axi, and axi_lite_xbar, axi_multicut, axi_serializer, axi_sim_mem: Prefix req_t and resp_t type parameters with axi_. This prevents type collisions in tools that have problems with correct type resolution and isolation. This change is backward-incompatible for all instances of the listed modules outside this repository. Users must update all instances of the listed modules in their code. Interface variants are not affected and remain backward-compatible.

0.31.1 - 2022-01-17

Fixed

• axi_xbar: Fix signal width for single master port. Before this fix, a crossbar instantiated with a single master port would contain arrays with incorrect dimensions.

0.31.0 - 2021-12-07

Added

• Add three modules to convert between any two AXI ID widths under many different concurrency requirements:
  • axi_iw_converter is the top-level module that converts between any two AXI ID widths with all supported parameters. It upsizes IDs by extending the MSBs with zeros and joins two interfaces with identical ID widths. For downsizing IDs, it instantiates one of the following two modules:
  • axi_id_remap remaps AXI IDs from wide IDs at the slave port to narrower IDs at the master port without serializing transactions.
  • axi_id_serialize reduces AXI IDs by serializing transactions when necessary.

0.30.0 - 2021-12-01

Added

• Add axi_lite_xbar_intf interface variant of axi_lite_xbar.

Fixed

• axi_lite_demux: Improve compatibility with new version of QuestaSim's optimizer (vopt). Before this workaround, QuestaSim 2021.1 could segfault on instances of axi_lite_demux.

0.29.2 - 2021-11-12

Fixed

• axi_demux: Improve compatibility with VCS (#187). The workaround of #169 was not compatible with VCS 2020.12. That workaround is now only active if TARGET_VSIM is defined.
• axi_dw_downsizer and axi_dw_upsizer (part of axi_dw_converter): Avoid latch inference on the Mentor Precision synthesis tool.
• axi_lite_cdc_src_intf: Fix _i and _o suffixes in instantiation of axi_cdc_src.
• axi_test::axi_rand_slave: Improve compatibility with VCS (#175).
• axi_test::axi_scoreboard: Add default value to parameters to improve compatibility with some tools.

0.29.1 - 2021-06-02

Fixed

• axi_lite_to_apb_intf: Add missing parameters, which were added to axi_lite_to_apb in v0.28.0.

0.29.0 - 2021-05-06

Changed

• axi_xbar and axi_demux: Add support for unique IDs by adding a UniqueIds parameter to both modules (#172). If you can guarantee that the ID of each transaction is always unique among all in-flight transactions in the same direction, setting the UniqueIds parameter to 1'b1 simplifies the demultiplexer (see documentation of axi_demux for details). This change is backward-compatible on axi_demux (because the default value of the new parameter is 1'b0). As axi_xbar is configured with the xbar_cfg_t struct, this change is not backward-compatible for axi_xbar (except for xbar_cfg_ts initialized with a default part).

Fixed

• axi_test::axi_rand_master: Refactor ID legalization into common function to simplify the implementation and remove redundant code. No known functional bug was fixed, but the correctness of the refactored code can be asserted more easily.

0.28.0 - 2021-04-15

Added

• Add source- and destination-clock-domain "halves" for the clock domain crossing (CDC): axi_cdc_src and axi_cdc_dst. This is implemented by refactoring the axi_cdc module, so the implementation is reused from the existing axi_cdc module. To avoid code duplication, axi_cdc now instantiates an axi_cdc_src connected to an axi_cdc_dst.

Changed

• axi_lite_to_apb: Make pipeline registers on request and response path optional (can be enabled with the new PipelineRequest and PipelineResponse parameters), and disable those pipeline registers by default.

Fixed

• axi_demux: Improve compatibility with new version of QuestaSim's optimizer (vopt) (#169). Before this workaround, QuestaSim 2020.2 and 2021.1 could segfault on instances of axi_demux.

0.27.1 - 2021-02-01

Fixed

• axi_dw_downsizer and axi_dw_upsizer (part of axi_dw_converter): Fix declaration order of w_req_t, w_req_d, and w_req_q to remove problematic forward references.
• FuseSoC: Fix version of common_cells (1.21.0).

0.27.0 - 2021-02-01

Added

• assign.svh: Add macros for assigning between AXI-Lite structs, both inside a process (AXI_LITE_SET_*_STRUCT) and outside a process (AXI_LITE_ASSIGN_*_STRUCT). This is safer than assigning structs with a simple =, because the macros assign individual fields.
• typedef.svh: Add AXI_TYPEDEF_ALL and AXI_LITE_TYPEDEF_ALL macros for defining all channels and request/response structs of an AXI4+ATOPs and an AXI4-Lite interface, respectively, in a single macro call.
• axi_test::axi_rand_slave: Add parameter RAND_RESP, which enables randomization of the resp field in B and R beats.

Changed

• axi_test::axi_rand_master: Randomize the QoS field.
• Update common_verification dependency to 0.2.0, which has been released for more than a year.
• Update common_cells dependency to 1.21.0 to align on version 0.2.0 of the common_verification dependency. This includes version 1.20.1 of common_cells, which fixes an out-of-bounds index in axi_burst_splitter (#150).

0.26.0 - 2021-01-19

Added

• Add infinite, simulation-only memory axi_sim_mem.
• assign.svh: Add macros for assigning between structs, both inside a process (AXI_SET_*_STRUCT) and outside a process (AXI_ASSIGN_*_STRUCT). This is safer than assigning structs with a simple =, because the macros assign individual fields. (Fields that mismatch between two structs, e.g., due to different user signal widths, should, and in some cases must, be still assigned separately.)

Changed

• Rename the following classes in axi_test to follow the convention that all user-facing objects in this repository start with axi_:
  • rand_axi_lite_master to axi_lite_rand_master,
  • rand_axi_lite_slave to axi_lite_rand_slave,
  • rand_axi_master to axi_rand_master, and
  • rand_axi_slave to axi_rand_slave.

0.25.0 - 2021-01-14

Added

• axi_xbar: Add parameter to disable support for atomic operations (ATOPs).

Changed

• AXI_BUS, AXI_BUS_ASYNC, AXI_BUS_DV, AXI_LITE, and AXI_LITE_DV: Change type of every parameter from int to int unsigned. An unsigned type is more appropriate, because none of those parameters can actually take a negative value, and it improves compatibility with some tools.
• axi_test::rand_axi_lite_slave and axi_test::rand_axi_lite_master: Change type of address and data width parameters (AW and DW) from int to int unsigned. Same rationale as for AXI_BUS (et al.) above.

Fixed

• axi_demux: Break combinatorial simulation loop.
• axi_xbar: Improve compatibility with vsim version 10.6c (and earlier) by introducing a workaround for a tool limitation (#133).
• tb_axi_lite_regs: Removed superfluous hardcoded assertion.
• Improve compatibility with Vivado XSim by disabling formal properties in axi_demux, axi_err_slv, and axi_xbar if XSIM is defined.

0.24.2 - 2021-01-11

Changed

• axi_test::rand_axi_lite_master and axi_test::rand_axi_lite_slave: Specify default values for parameters to improve compatibility with tools that require a default value for every parameter.

Fixed

• axi_lite_demux: Move typedef out of generate block to improve compatibility with VCS.
• axi_test::rand_axi_master and axi_test::rand_axi_slave: Fix call to randomize function for class variables. Prior to this fix, the std::randomize() function was used for three class variables, but class variables must use the .randomize() member function.

0.24.1 - 2020-11-04

Changed

• Update common_cells dependency to 1.20.0 to fix file order in IPApproX.

Fixed

• doc/axi_lite_mailbox: Fix position of RFIFOL and WFIFOL in STATUS register.
• IPApproX:
  • Add missing link against common_cells_lib.
  • Fix include path for common_cells.
  • Fix version specification of common_verification.

0.24.0 - 2020-10-27

Added

• axi_pkg: Add function that defines response precedence.

Changed

• axi_dw_downsizer and axi_dw_upsizer: Pipeline injection of atomic AWs into the AR channel to shorten the critical path.

Fixed

• axi_dw_downsizer and axi_dw_upsizer: Improve portability of bit slice assignment constructs.
• axi_dw_downsizer:
  • Forward worst response among split transactions.
  • Fix overflow of B forward FIFO.
• axi_test: Remove minimal length constraint from rand_atop_burst.

0.23.2 - 2020-09-14

Fixed

• ips_list.yml: Add missing common_verification dependency.

0.23.1 - 2020-06-19

Fixed

• axi_lite_demux_intf: Fix passing of req_t and resp_t parameters to axi_lite_demux.
• axi_lite_xbar: Add missing slv_a{w,r}_cache_i connections on axi_lite_to_axi instance.

0.23.0 - 2020-05-11

Added

• axi_lite_regs: Add memory-mapped registers with AXI4-Lite slave port and the option to make individual bytes read-only.

Changed

• Interfaces AXI_LITE and AXI_LITE_DV: add aw_prot and ar_prot signals.
  • The AXI_LITE_ASSIGN* and AXI_LITE_SET* macros (in include/axi/assign.svh) have been updated to include the two new interface signals.
  • axi_test::axi_lite_driver: A new prot function argument has been added to the send_aw, send_ar, recv_aw, and recv_ar functions.
  • axi_test::rand_axi_lite_master:
    • A new w_prot and r_prot function argument has been added to the write and read function, respectively. The new arguments have a default value of '0.
    • The send_aws and the send_ars function now randomizes the prot signal of each AW and AR, respectively.
  • axi_test::rand_axi_slave: Display prot signal (but otherwise still ignore it).

Fixed

• rand_axi_master (in axi_test): Another fix to respect burst type restrictions when emitting ATOPs.

0.22.1 - 2020-05-11

Fixed

• rand_axi_master (in axi_test): Respect burst type restrictions when emitting ATOPs.

0.22.0 - 2020-05-01

Added

• axi_pkg: Add bufferable and modifiable helper functions.
• axi_dw_converter: Add support for single-beat fixed bursts in the downsizer and for fixed bursts of any length in the upsizer.

Changed

• axi_dw_downsizer (part of axi_dw_converter): Downsize regardless of the modifiable bit of incoming transactions. Previously, non-modifiable transactions whose attributes would have to be modified for downsizing were rejected with a slave error. As of this change, transactions are downsized and their attributes modified even if their modifiable bit is not set. This is permitted by a note in the AXI specification (page A4-65 of IHI0022H).

Fixed

• axi_dw_downsizer (part of axi_dw_converter): Fix condition for keeping transactions that have a smaller size than the master/downstream port unmodified.

0.21.0 - 2020-04-27

Added

• axi_serializer: serialize transactions with different IDs to the same ID.

Changed

• axi_modify_address:
  • Simplify redundant slv_resp_t and mst_resp_t parameters to single axi_resp_t parameter.
  • Remove unnecessary slv_a{r,w}_addr_o outputs, which were fed back from the slv_req_i inputs. Those signals can instead be derived outside axi_modify_address.
• axi_modify_address_intf:
  • Change name of slave port to slv and master port to mst and change name of associated parameters to align them with repository conventions.
  • Change type of parameters to int unsigned because their values are unsigned.
  • Add parameters for data, ID, and user width to avoid derivation from interface, which is incompatible with many tools.
  • Add missing I/O suffixes to port names and align them with axi_modify_address.

Fixed

• axi_modify_address_intf: Fix type parameters passed to actual implementation.

0.20.0 - 2020-04-22

Added

• axi_pkg: Add wrap_boundary function to calculate the boundary of a wrapping burst.
• axi_test: The random AXI master rand_axi_master can now emit wrapping bursts (but does not do so by default). Three new parameters control the burst types of the emitted transactions; not setting those parameters means the random master behaves as it did before this change.
• Interface AXI_BUS_DV: Add Monitor modport, in which all signals are inputs.
• axi/assign.svh: Add AXI_ASSIGN_MONITOR macro, which assigns an AXI_BUS to an AXI_BUS_DV.Monitor.
• Package axi_test: Add axi_scoreboard class, which checks that data read from a memory address matches data written to that address.

Changed

• axi_pkg:
  • The beat_addr function now supports all burst types. Due to this, the function has two new arguments (the length and type of the burst).
  • The beat_upper_byte and beat_lower_byte functions internally call beat_addr, so they have two new arguments as well.

0.19.0 - 2020-04-21

Changed

• axi_lite_to_axi: Expose AxCACHE signals. It is now possible to define the cache signal of AXI transactions coming out of this module by driving the added slv_aw_cache_i and slv_ar_cache_i inputs. To retain the behavior prior to this change, tie those two inputs to zero.

0.18.1 - 2020-04-08

Fixed

• axi_modify_address: Fix unconnected w_valid.
• axi_dw_converter: Fix internal inversion of up- and downconversion, which led to incorrect lane steering and serialization.
• rand_axi_master (in axi_test): In ATOP mode, this module could get stuck receiving an R beat when only writes (without ATOP read responses) were left to complete. This has been fixed.
• assign.svh: Remove spurious semicolons.
• axi_lite_to_apb: Fix message of assertion checking the strobe width.

0.18.0 - 2020-03-24

Added

• axi_dw_converter: a data width converter between AXI interfaces of any data width. Depending on its parametrization, this module instantiates one of the following:
  • axi_dw_downsizer: a data width converter between a wide AXI master and a narrower slave.
  • axi_dw_upsizer: a data width converter between a narrow AXI master and a wider slave.

0.17.0 - 2020-03-23

Added

• Add axi_isolate to isolate downstream slaves from receiving new transactions.

Changed

• axi_lite_to_axi: Add mandatory AxiDataWidth parameter to enable fix mentioned below.

Fixed

• Improve compatibility with Xcelium:
  • by removing unsupported hierarchical argument to $bits() function in axi_lite_to_axi;
  • by removing unsupported struct assignment in axi_lite_demux.

0.16.3 - 2020-03-19

Changed

• axi_err_slv: Add optional parameter to define data returned by read response. The parameter defaults to a 64-bit value, so buses with data width larger than or equal to 64 bit see an additional 32-bit value in error responses compared to the prior version. Other than that, this change is fully backward compatible.

0.16.2 - 2020-03-16

Fixed

• axi_atop_filter: Fix underflow in counter for AxiMaxWriteTxns = 1.

0.16.1 - 2020-03-13

Fixed

• Remove whitespace in and semicolon after macro calls.
• axi_intf: Improve Verilator compatibility by disabling unsupported assertions.

0.16.0 - 2020-03-11

Added

• axi_cdc_intf: Add interface variant of AXI clock domain crossing.

Fixed

• axi_cdc: Remove unused global import axi_pkg::*.
• axi_intf: Remove global import axi_pkg::* and explicitly use symbols from axi_pkg.
• axi_lite_cut_intf: Add missing assigns to and from interface ports.
• tb_axi_cdc:
  • Remove global import axi_pkg::*.
  • Define channels with AXI_TYPEDEF macros instead of local typedefs.

Removed

• Remove unused AXI_ARBITRATION and AXI_ROUTING_RULES interfaces.

0.15.1 - 2020-03-09

Added

• axi_intf: Add single-channel assertions to AXI_BUS_DV.

Fixed

• axi_lite_to_apb: Fix the interface version (axi_lite_to_apb_intf) to match the changes from version 0.15.0.
• axi_demux: When MaxTrans was 1, the IdCounterWidth became 0. This has been fixed.
• axi_atop_filter:
  • The master interface of this module in one case depended on aw_ready before applying w_valid, which is a violation of the AXI specification that can lead to deadlocks. This issue has been fixed by removing that dependency.
  • The slave interface of this module could illegally change the value of B and R beats between valid and handshake. This has been fixed.
• rand_axi_master (in axi_test):
  • Fix infinite wait in send_ws task.
  • Decouple generation of AWs from sending them. This allows to apply W beats before or simultaneous with AW beats.
• rand_axi_slave (in axi_test):
  • Decouple receiving of Ws from receiving of AWs. This allows to receive W beats independent of AW beats.
• Update common_cells to 1.16.4 to fix synthesis warning in id_queue.

0.15.0 - 2020-02-28

Added

• axi_burst_splitter: Split AXI4 bursts to single-beat transactions.

Changed

• axi_lite_to_apb: The psel field of the apb_req_t struct is now a single bit. That is, every APB slave has its own request struct. Accordingly, apb_req_o is now an array with NoApbSlaves entries.
• axi_decerr_slv has been replaced by a more generic axi_err_slv, which takes the kind of error as parameter. This axi_err_slv no longer has a FallThrough parameter; instead, a response (i.e., B or R beat) now always comes one cycle after the AW or AR beat (as required by the AXI Spec) but the slave can accept a W beat in the same cycle as the corresponding AW beat. Additionally, axi_err_slv got a parameter ATOPs that defines if it supports atomic operations.
• axi_to_axi_lite: Rework module to structs and add burst support.

Fixed

• axi_demux: The case statement controlling the counters had not been specified unique even though it qualified for it. This has been fixed.
• axi_lite_mux_intf: Fix signal names in internal assignments, names of parameters of axi_lite_mux instance, and typos in assertion messages.

0.14.0 - 2020-02-24

Added

• Add axi_lite_mailbox: AXI4-Lite mailbox.

0.13.0 - 2020-02-18

Added

• axi_xbar_intf: Add interface variant of crossbar.

Fixed

• axi_atop_filter: Fix ModelSim warnings by adding default statement. The signal in the case has a single bit, and both values were correctly handled in synthesis. However, when starting simulation, the signal has an undefined value, and ModelSim threw warnings that this violated the unique condition.
• axi_demux: Move typedef outside generate for compatibility with VCS.
• axi_id_prepend:
  • Fix text of some assertion messages.
  • Fix case of prepending a single-bit ID.
• tb_axi_xbar: Fix for localparam AxiIdWidthSlaves to be dependent on the number of masters.

0.12.0 - 2020-02-14

Added

• axi_lite_to_apb: AXI4-Lite to APB4 converter.

0.11.0 - 2020-02-13

Added

• axi_cdc: Add a safe AXI clock domain crossing (CDC) implementation.

Changed

• The interface variants of axi_demux and axi_mux have been changed to match the convention for interface variants in this repository:
  • axi_demux_wrap: Change name to axi_demux_intf and change parameter names to ALL_CAPS.
  • axi_mux_wrap: Change name to axi_mux_intf, and change parameter names to ALL_CAPS.
• axi_demux: Default parameters to 0.

Fixed

• axi_demux: Add parameter case for NoMstPorts == 1.

0.10.2 - 2020-02-13

Fixed

• axi_atop_filter: Remove unreachable default in unique case block.
• axi_demux_wrap: Fix signals passed to demux.
• axi_lite_demux_intf: Fix signal passed to demux.
• axi_lite_mux: Add missing declaration of r_fifo_push.

0.10.1 - 2020-02-12

Fixed

• axi_lite_xbar: Fix synthesis for NoMstPorts == 1.

0.10.0 - 2020-02-11

Added

• axi_lite_xbar: fully-connected AXI4-Lite crossbar.
• axi_lite_demux: AXI4-Lite demultiplexer from one slave port to a configurable number of master ports.
• axi_lite_mux: AXI4-Lite multiplexer from a configurable number of slave ports to one master port.

Changed

• axi_test: Extended package with random AXI4-Lite master and slave test bench classes.

0.9.2 - 2020-02-11

Fixed

• axi_pkg: Fix value of CUT_ALL_PORTS (in xbar_latency_e) in Vivado synthesis.

0.9.1 - 2020-01-18

Fixed

• axi_decerr_slv: Fix parameter to be UpperCamelCase

0.9.0 - 2020-01-16

Added

• axi_test: Constrained randomizing AXI master (rand_axi_master) and slave (rand_axi_slave).
  • rand_axi_master issues a configurable number of read and write transactions to configurable memory regions (address ranges with associated memory types) and with random properties within constraints (e.g., burst length, exclusive accesses, atomic operations).
  • rand_axi_slave responds to transactions with random delays and data.
• axi_pkg: AXI memory types (mem_type_t) and functions get_arcache and get_awcache to calculate AxCACHE bits for a given memory type.
• Add axi_decerr_slv.
• Add axi_id_prepend.
• Add fully compliant axi_xbar.
• Add documentation on axi_mux, axi_demux and axi_xbar
• Module overview to README.md

Changed

• axi_test: The reset tasks in axi_driver and axi_lite_driver are now functions.
• Bump common_cells to 1.16.0 which contains the address decoding logic used in axi_xbar.

Fixed

• axi_intf move import into interface bodies.
• axi_pkg make functions automatic, fixing a problem with Synopsys.

0.8.2 - 2019-12-20

Fixed

• src_files.yml: Add only_local flag for axi_test.
• axi_test:
  • Add missing default parameters to axi_lite_driver.
  • Move wildcard import from axi_test into package to prevent pollution of compilation unit.

0.8.1 - 2019-12-19

Added

• axi_pkg: Functions to calculate addresses and byte positions within a beat.

0.8.0 - 2019-12-19

All modules have been changed from SystemVerilog interfaces to struct ports. Thus, all modules in this repository are now available in tools that do not support interfaces. Interfaces are now opt-in: every module has a variant with _intf suffix that is functionally equivalent but has interfaces instead of struct ports. If you would like to keep using interfaces, please add an _intf suffix to any module you are using from this repository. Some _intf variants require more parameters (e.g., to define the ID width) than the module prior to this release, but otherwise the _intf variants are drop-in replacements.

We encourage the use of structs to build AXI infrastructure, and we have added a set of typdef macros and have extended the assign macros to keep designers productive and prevent mismatches.

Additionally, we have removed a set of modules that had known issues. We will provide new implementations for these modules in near-term releases and no longer support the removed modules.

The individual changes for each module follow.

Added

• assign.svh:
  • Macros for setting an AXI or AXI-Lite interface from channel or request/response structs inside a process (AXI_SET_FROM_* and AXI_LITE_SET_FROM_*) and outside a process like an assignment (AXI_ASSIGN_FROM_* and AXI_LITE_ASSIGN_FROM_*).
  • Macros for setting channel or request/response structs to the signals of an AXI or AXI-Lite interface inside a process (AXI_SET_TO_* and AXI_LITE_SET_TO_*) and outside a process like an assignment (AXI_ASSIGN_TO_*, AXI_LITE_ASSIGN_TO_*).
• typedef.svh: Macros for defining AXI or AXI-Lite channel (AXI_TYPEDEF_*_CHAN_T and AXI_LITE_TYPEDEF_*_CHAN_T) and request/response structs (AXI_TYPEDEF_RE{Q,SP}_T and AXI_LITE_TYPEDEF_RE{Q,SP}_T).

Changed

• axi_atop_filter has been changed from interfaces to struct ports. Please use the newly added axi_atop_filter_intf module if you prefer interfaces.
• axi_cut has been changed from interfaces to struct ports. Please use the newly added axi_cut_intf module if you prefer interfaces.
• axi_delayer has been changed from interfaces to struct ports. Please use the newly added axi_delayer_intf module if you prefer interfaces.
• axi_join has been renamed to axi_join_intf, and axi_lite_join has been renamed to axi_lite_join_intf. To join two structs, simply assign them instead.
• axi_multicut has been changed from interfaces to struct ports. Please use the newly added axi_multicut_intf module if you prefer interfaces.
• axi_modify_address has been changed from interfaces to struct ports. Please use the newly added axi_modify_address_intf module if you prefer interfaces.
• axi_lite_to_axi has been changed from interfaces to struct ports. Please use the newly added axi_lite_to_axi_intf module if you prefer interfaces.

Removed

• axi_lite_xbar: This interconnect module was not a full crossbar and its routing rules interface no longer fits our demands. A replacement will be provided in a near-term release.
• axi_address_resolver was used together with axi_lite_xbar and is removed along with it. If a standalone replacement for this module is required, please use addr_decoder from common_cells.
• axi_arbiter was used together with axi_lite_xbar and is removed along with it. If a standalone replacement of this module is required, please use rr_arb_tree from common_cells. A near-term release will introduce an AXI multiplexer and demultiplexer to suit protocol-specific needs.
• axi_id_remap had problems with ordering and ATOPs. A new, correct implementation will be provided in a near-term release.
• axi_lite_cut has been rendered unnecessary by changing axi_cut to struct ports. To get a cut with AXI-Lite ports, simply pass AXI-Lite channels and request/response structs as parameters. If you prefer interfaces, please replace any axi_lite_cut with the newly added axi_lite_cut_intf module.
• axi_lite_multicut: same rationale and transition procedure as for axi_lite_cut.
• In axi_pkg, the *Width localparams and the id_t, addr_t, etc. typedefs have been removed. There is no one-fits-all value of these parameters, so we cannot provide a generic definition for them in this package. Please use the added macros in typedef.svh to define your own types with a few lines of code (which you can put into your own package, for example).

0.7.2 - 2019-12-03

Fixed

• axi_to_axi_lite: Fix underflow in internal buffers.
• axi_to_axi_lite: Remove restriction on size of internal buffers.

0.7.1 - 2019-11-19

Changed

• axi_multicut: Simplified implementation without changing I/O behavior.

Fixed

• src_files: Removed axi_test.sv from synthesized files.
• tb_axi_lite_xbar: Fixed AW->W dependency.

0.7.0 - 2019-05-28

Changed

• The in and out modports have been removed from the interface definition of both AXI and AXI Lite. These modports were "aliases" of Slave and Master, respectively, and caused problems because many tools did not recognize the aliases as being identical to Slave and Master.

0.6.0 - 2019-02-27

Changed

• AXI interfaces now include the aw_atop signal. Interfaces, macros, and existing modules and TBs in this repository have been updated. The ReadMe has been updated to guide users of this repository on how to deal with the aw_atop signal.

Added

• Add AXI atomic operations (ATOPs) filter.

Fixed

• Replace non-ASCII characters in Solderpad license text.
• Add a trailing semicolon to the AXI_ASSIGN() and AXI_LITE_ASSIGN() macros in assign.svh (#8). Those macros can now be used without a semicolon. Existing code that uses the macros with a semicolon do not break.

0.5.0 - 2018-12-18

• Add axi channel delayer

Changed

• Remove clock from AXI_BUS and AXI_LITE. Such a clock signal is useful for testing purposes but confusing (or even harmful) in hardware designs. For testing purposes, the AXI_BUS_DV and AXI_LITE_DV (suffix for "design verification") interfaces have been defined instead.

Fixed

• Update src_files.yml to match Bender.yml.
• Add missing axi_test to compile script.

0.4.5 - 2018-09-12

Fixed

• Fix common_cells dependency to open-source repo

0.4.4 - 2018-09-06

Changed

• Make axi_cut and axi_multicut verilator compatible

0.4.3 - 2018-08-01

Changed

• Add license file and adjust copyright headers.

0.4.2 - 2018-06-02

Fixed

• Add test mode signal to axi_to_axi_lite adapter, used in the FIFOs.
• Remove axi_find_first_one from src_files.yml
• Fix release ID issue in ID axi_id_remap

0.4.1 - 2018-03-23

Fixed

• Remove time unit from test package. Fixes an issue in the AXI driver.

0.4.0 - 2018-03-20

Added

• Add AXI ID remapper.

Fixed

• Fixed typos in the AXI and AXI-Lite multicuts.
• Fixed ID width in AXI ID remapper.
• AXI join now asserts if width of outgoing ID is larger or equal to width of incoming ID.

0.3.0 - 2018-03-09

Added

• AXI and AXI-Lite multicuts

0.2.1 - 2018-03-09

Fixed

• Remove axi_find_first_one.sv from manifest

0.2.0 - 2018-03-09

Added

• AXI cut

0.1.0 - 2018-03-09

• Initial release with various interfaces, drivers for testbenches, and utility modules.