All releases are available from the GitHub Releases Page.
Cocotb 1.4.0.dev0 (2020-02-22)¶
Add support for distinguishing between NET (vpiNet) and REG (vpiReg) type when using vpi interface. (#1107)
Cocotb now supports the following example of forking a non-decorated async coroutine.
async def example(): for i in range(10): await cocotb.triggers.Timer(10, "ns") cocotb.fork(example())
As such, it is now possible to override the default cocotb logging behavior with something like:
# remove the cocotb log handler and formatting root = logging.getLogger() for h in root.handlers[:]: root.remove_handler(h) h.close() # add your own logging.basicConfig()
Cocotb now supports deposit/force/release/freeze actions on simulator handles, exposing functionality similar to the respective Verilog/VHDL assignments.
from cocotb.handle import Deposit, Force, Release, Freeze dut.q <= 1 # A regular value deposit dut.q <= Deposit(1) # The same, higher verbosity dut.q <= Force(1) # Force value of q to 1 dut.q <= Release() # Release q from a Force dut.q <= Freeze() # Freeze the current value of q
Custom logging handlers can now access the simulator time using
logging.LogRecord.created_sim_time, provided the
SimTimeContextFilterfilter added by
default_config()is not removed from the logger instance. (#1411)
Questa now supports
PLUSARGS. This requires that
tcl.hbe present on the system. This is likely included in your installation of Questa, otherwise, specify
If a makefile uses cocotb’s
make helpnow lists the supported targets and variables. (#1318)
Cocotb no longer supports Python 2, at least Python 3.5 is now required. Users of Python 2.7 can still use cocotb 1.3, but are heavily encouraged to update. It is recommended to use the latest release of Python 3 for improved performance over older Python 3 versions. (#767)
Questa now interprets relative paths to source files as relative to the Makefile, the same behavior used by other simulators. (#1063)
Released on 08 January 2020
This will likely be the last release to support Python 2.7.
Initial support for the Verilator simulator (version 4.020 and above). The integration of Verilator into cocotb is not yet as fast or as powerful as it is for other simulators. Please use the latest version of Verilator, and report bugs if you experience problems.
New makefile variables
COCOTB_HDL_TIMEPRECISIONfor setting the default time unit and precision that should be assumed for simulation when not specified by modules in the design. (#1113)
cocotb.__version__constant, which contains the version number of the running cocotb. (#1196)
Notable changes and bug fixes¶
DeprecationWarnings are now shown in the output by default.
Tracebacks are now preserved correctly for exceptions in Python 2. The tracebacks in all Python versions are now a little shorter.
assertwill be considered a test failure. Previously, it was considered a test error.
Many (editorial) documentation improvements.
AvalonSTPktsWithChanneltype is deprecated. Use the
Released on 24 July 2019
asyncfunctions and generators was added (Python 3 only). Please have a look at Async functions for an example how to use this new feature.
VHDL block statements can be traversed. (#850)
Support for Python 3.7 was added.
Notable changes and bug fixes¶
The heart of cocotb, its scheduler, is now even more robust. Many small bugs, inconsistencies and unreliable behavior have been ironed out.
Exceptions are now correctly propagated between coroutines, giving users the “natural” behavior they’d expect with exceptions. (#633)
setimmediatevalue()function now works for values larger than 32 bit. (#768)
The documentation was cleaned up, improved and extended in various places, making it more consistent and complete.
Tab completion in newer versions of IPython is fixed. (#825)
Python 2.6 is officially not supported any more. cocotb supports Python 2.7 and Python 3.5+.
The cocotb GitHub project moved from
cocotb/cocotb. Redirects for old URLs are in place.
The bits argument to
BinaryValue, which is now called n_bits.
The logger attribute of log objects like
some_coro.log, which is now just an alias for
cocotb.utils.get_python_integer_typesfunction, which was intended to be private.
Depending on your simulation, cocotb 1.2 might be roughly 20 percent slower than cocotb 1.1. Much of the work in this release cycle went into fixing correctness bugs in the scheduler, sometimes at the cost of performance. We are continuing to investigate this in issue #961. Independent of the cocotb version, we recommend using the latest Python 3 version, which is shown to be significantly faster than previous Python 3 versions, and slightly faster than Python 2.7.
Please have a look at the issue tracker for more outstanding issues and contribution opportunities.
Released on 24 January 2019.
This release is the result of four years of work with too many bug fixes, improvements and refactorings to name them all. Please have a look at the release announcement on the mailing list for further information.
Released on 15 February 2015.
FLI support for ModelSim
Mixed Language, Verilog and VHDL
300% performance improvement with VHPI interface
WaveDrom support for wave diagrams.
Released on 25 February 2014.
Issue #101: Implement Lock primitive to support mutex
Issue #105: Compatibility with Aldec Riviera-Pro
Issue #109: Combine multiple
results.xmlinto a single results file
Issue #111: XGMII drivers and monitors added
Issue #113: Add operators to
Issue #116: Native VHDL support by implementing VHPI layer
Issue #117: Added AXI4-Lite Master BFM
Released on 27 September 2013.
This contains a raft of fixes and feature enhancements.
Released on 19 July 2013.
Release 0.2 supports more simulators and increases robustness over 0.1.
A centralized installation is now supported (see documentation) with supporting libraries build when the simulation is run for the first time.
Released on 9 July 2013.
The first release of cocotb.
Allows installation and running against Icarus, VCS, Aldec simulators.