Open Source VHDL Verification Methodology | Jim Lewis | Activity https://osvvm.org/members/jiml/activity Activity feed for Jim Lewis. Sun, 26 Apr 2026 00:21:41 +0100 https://buddypress.org/?v= en-US 30 hourly 2 7a249505dde3ff270a955aa172ffc4ed Jim Lewis replied to the topic Checking AXI data when using WSTRB in the forum OSVVM https://osvvm.org/forums/topic/checking-axi-data-when-using-wstrb#post-2909 Fri, 17 Apr 2026 03:41:26 +0100 Hi Jon,
Which OSVVM VC are you using?

For AXI4 Manager, it writes a U to memory in locations when WSTRB is 0. The U will not be stored in memory. For reading, there is no indication the data is valid or not. Hence, if your burst FIFO is organized as words, you will need to exclude those bits from comparing to X”020100–“. The ‘-‘ is…[Read more]

]]> 0 d1145cca1e0c28811771843b3c23878b Jim Lewis replied to the topic Problem simulating with genrics in the forum OSVVM https://osvvm.org/forums/topic/problem-simulating-with-genrics#post-2906 Tue, 14 Apr 2026 19:20:10 +0100 Be sure to try setting the generic defaults via the component (if used) or entity (if component not used).

]]> 0 8b9c18cb9fca2a04d9e85c45950b6f2d Jim Lewis replied to the topic Problem simulating with genrics in the forum OSVVM https://osvvm.org/forums/topic/problem-simulating-with-genrics#post-2904 Tue, 14 Apr 2026 16:46:12 +0100 In VendorScripts_Questa (if version is 2025 or newer) or VendorScripts_Siemens, the generic switch is set by the following:
# -------------------------------------------------
proc vendor_generic {Name Value} {

return "-g${Name}=${Value}"
}

According to the Questa command reference,
-g <Name>=<Value> …
(optional) Assigns a value to all s…[Read more]

]]> 0 5b874d086449aa845d21f2aefd7048aa Jim Lewis replied to the topic Issue with xMiiMacTransmitter.vhd in the forum OSVVM https://osvvm.org/forums/topic/issue-with-xmiimactransmitter-vhd#post-2895 Wed, 25 Mar 2026 16:17:42 +0000 Hi Jerome,
I suspect that I agree.

It seems to be in:
* xMiiMacTransmitter.vhd (as you reported)
* xMiiPhyRxTransmitter.vhd
* xMiiPhyTxReceiver.vhd

Do you concur that all of these should be updated?

They pass all my tests – but only because they all have the same issue.

I have updated these and pushed them to the dev branch of OSVVM.

Best…[Read more]

]]> 0 35066582eaf2d758f69ba74285b22664 Jim Lewis replied to the topic NVC Simulation Error in the forum OSVVM https://osvvm.org/forums/topic/nvc-simulation-error#post-2894 Wed, 25 Mar 2026 15:50:06 +0000 Hi Dave,
Is get_component_name a function that has an optional boolean parameter and returns type string?
It would help to see its definition, however, I will make some guesses.

I have seen this issue before when the optional parameter is type integer, but never with type boolean.
With type integer, in this context, it is correct if…[Read more]

]]> 0 389fee74747227636153bdfe27f4fced Jim Lewis replied to the topic Problem with the AXI stream receiver in the forum OSVVM https://osvvm.org/forums/topic/problem-with-the-axi-stream-receiver#post-2891 Wed, 25 Mar 2026 15:13:47 +0000 Hi Jon,
What is the value of TValid during that time? If you do a get and TValid is true, the VC will receive data.

To avoid these sort of things, I usually hold off calling Get until the DUT is out of reset.

Best Regards,
Jim

]]> 0 060e285af38589c6e1c93321e4823b19 Jim Lewis replied to the topic XSIM 2025.2 issue with CovPType in procedure in the forum OSVVM https://osvvm.org/forums/topic/xsim-2025-2-issue-with-covptype-in-procedure#post-2890 Wed, 25 Mar 2026 15:01:32 +0000 Hi Matthias,
XSIM seems to be a moving target. In 2024.2 similar things happened. Some of what worked in 2023.2 no longer worked. I was able to change things so they worked again – and many things that did not work previously started to work.

Best Regards,
Jim

]]> 0 49f18623c9a0313b664be8bd51b7ec18 Jim Lewis replied to the topic Problem simulating with genrics in the forum OSVVM https://osvvm.org/forums/topic/problem-simulating-with-genrics#post-2889 Wed, 25 Mar 2026 14:53:20 +0000 Hi Jon
Is the generic at the top level of the testbench or is it at a lower level?

Best Regards,
Jim

]]> 0 7a395a44765847c9fa4fb5ee5425c9a3 Jim Lewis wrote a new post https://osvvm.org/?p=2882 Thu, 05 Mar 2026 03:47:28 +0000 OSVVM 2026.01 The OSVVM 2026.01 release adds one big feature, PCIe CoSim Verification Component, and numerous smaller updates.   PCIe CoSim Verification […]

]]> 0 e5717b2e142c0aaf343b472c7e028407 Jim Lewis replied to the topic Is there a built-in way in OSVVM to detect build failure without parsing logs? in the forum OSVVM https://osvvm.org/forums/topic/is-there-a-built-in-way-in-osvvm-to-detect-build-failure-without-parsing-logs#post-2876 Sat, 21 Feb 2026 23:15:30 +0000 Using a test reporter is the intended method to get this information in CI

]]> 0 1753e800bcf4e6ff533dae43b30950fc Jim Lewis replied to the topic Is there a built-in way in OSVVM to detect build failure without parsing logs? in the forum OSVVM https://osvvm.org/forums/topic/is-there-a-built-in-way-in-osvvm-to-detect-build-failure-without-parsing-logs#post-2874 Thu, 19 Feb 2026 16:26:52 +0000 Hi Amine,
If you are still in Tcl, there are a number of variables you can check with the build status. Currently these are not documented, but they should be. Lets start here:

* ::osvvm::ReportBuildName – Name of Build
* ::osvvm::BuildStatus – PASSED / FAILED
* ::osvvm::TestCasesPassed
* ::osvvm::TestCasesFailed
*…[Read more]

]]> 0 0e8235ce3f9a5e4209bd95147c3b9668 Jim Lewis replied to the topic Is there a built-in way in OSVVM to detect build failure without parsing logs? in the forum OSVVM https://osvvm.org/forums/topic/is-there-a-built-in-way-in-osvvm-to-detect-build-failure-without-parsing-logs#post-2866 Tue, 03 Feb 2026 17:45:01 +0000 Hi Amine,
CI will be running modelsim from the bash command line. And you can use:
vsim -c -do "exit -code [catch {source $OsvvmLibraries/Scripts/StartUp.tcl ; LinkLibraryDirectory ; build RunTest.pro}]

The “exit -code” is required to get the return status. What I return error on depends on what reporter I am using.

If I am using a JUnit…[Read more]

]]> 0 494da2d52792f947ebe1eb75829bdde3 Jim Lewis replied to the topic Is there a built-in way in OSVVM to detect build failure without parsing logs? in the forum OSVVM https://osvvm.org/forums/topic/is-there-a-built-in-way-in-osvvm-to-detect-build-failure-without-parsing-logs#post-2861 Sat, 17 Jan 2026 19:11:01 +0000 By failed, do you mean test case failed or the build process errored out for some reason? OSVVM has are controls for both of these.

From the OSVVM Settings User Guide, you will find that they are controlled by variables:

variable FailOnBuildErrors "true" ;# simulator command had errors
variable FailOnReportErrors "false" ;#…[Read more]

]]> 0 52723ecf0968ac01ca28260306255e64 Jim Lewis replied to the topic Confusion of Axi4Full Testcases in the forum OSVVM https://osvvm.org/forums/topic/confusion-of-axi4full-testcases#post-2859 Sat, 17 Jan 2026 00:08:17 +0000 Hi Veit,
Thanks for the issue reports. I have updated the names so they match. That said, since the test runner compiles and then runs the test case, the test case execution was still correct. I still hate it when the names do not match though.

You can also file issue reports like this on the VC’s issue page, such as for this…[Read more]

]]> 0 68df5a94ff29f5d3c7093010f50859f5 Jim Lewis replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2849 Fri, 02 Jan 2026 14:05:24 +0000 Hi Jon,
Thanks for sticking with this one. Knowing which version of Questa you had made told me I needed to search harder in VendorScripts_Questa.tcl. I found the issue. It is fixed on Dev.

If you do not want to update to the Dev branch, you can edit the line in VendorScripts_Questa.tcl that says:
set SimulateOptions [concat $::VsimArgs…[Read more]

]]> 0 85f31d0ab22001aeeb0e845d3edb841a Jim Lewis replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2847 Thu, 01 Jan 2026 22:50:15 +0000 Which version of Questa are you using?

Historically Questa offered either a vsim or a vopt/vsim flow. Up until 2025, OSVVM only supported the vsim flow, but supports both vsim and vopt/vsim flow.

The startup VendorScripts_Siemens.tcl supports the vsim flow. VendorScripts_Questa.tcl supports the vopt/vsim flow.

To choose which one you…[Read more]

]]> 0 8664ecc1e7a279dcae21616ee46edaac Jim Lewis replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2844 Thu, 01 Jan 2026 05:51:57 +0000 If you make this call:
SetSecondSimulationTopLevel glbl

Then OSVVM would do:
vsim -c -t ps -lib common_tb TbStream_SendGetBurst1_opt glbl -suppress 8683 -suppress 8684

That said, since a library is not specified for glbl, Questa will assume it to be in common_tb. So as a result, Questa may add the common_tb.glbl in their interpretation of…[Read more]

]]> 0 2ecbb1d821ee94b9dbe6e13c438ed104 Jim Lewis replied to the topic Osvvm LocalScriptsDefault.tcl location in the forum OSVVM https://osvvm.org/forums/topic/osvvm-localscriptsdefault-tcl-location#post-2837 Fri, 05 Dec 2025 02:34:09 +0000 Hi Senthil,
This is now fixed on the dev branch of OsvvmLibraries on GitHub. You can get the dev branch by doing:

git clone --recursive --branch dev https://github.com/osvvm/OsvvmLibraries

Best Regards,
Jim

]]> 0 11887aa76d48cd4bdf5bafa6e25bc132 Jim Lewis replied to the topic Using Cosimulation Framework with C/C++ Library in the forum OSVVM https://osvvm.org/forums/topic/using-cosimulation-framework-with-c-c-library#post-2836 Tue, 02 Dec 2025 17:45:51 +0000 It is Simon doing the heavy lifting.

]]> 0 33d26d337b3397a273543347358b1a1c Jim Lewis replied to the topic Using Cosimulation Framework with C/C++ Library in the forum OSVVM https://osvvm.org/forums/topic/using-cosimulation-framework-with-c-c-library#post-2834 Tue, 02 Dec 2025 16:35:01 +0000 Hi Eamon,
Simon posted the blog post that hopefully answers your question. See: https://osvvm.org/archives/2830

Best Regards,
Jim

]]> 0 c3b0d7e115c721312911ce41ec8f84c3 Jim Lewis replied to the topic Using Cosimulation Framework with C/C++ Library in the forum OSVVM https://osvvm.org/forums/topic/using-cosimulation-framework-with-c-c-library#post-2833 Tue, 02 Dec 2025 16:34:59 +0000 Hi Eamon,
Simon posted the blog post that hopefully answers your question. See: https://osvvm.org/archives/2830

Best Regards,
Jim

]]> 0 331e1cce2b8fb2c618a6600b68782bb4 Jim Lewis replied to the topic Using Cosimulation Framework with C/C++ Library in the forum OSVVM https://osvvm.org/forums/topic/using-cosimulation-framework-with-c-c-library#post-2826 Tue, 02 Dec 2025 11:43:04 +0000 Hi Eamon,
I have asked Simon to post a response to this. Unfortunately the website is having some issues with Simon being able to post a response to it. Hopefully it will be resolved shortly.

Many apologies. We usually get these type of things answered within a day or two of the post.

Best Regards,
Jim

]]> 0 b10ad9ddc7da0ec45685c043cf07f028 Jim Lewis replied to the topic Osvvm LocalScriptsDefault.tcl location in the forum OSVVM https://osvvm.org/forums/topic/osvvm-localscriptsdefault-tcl-location#post-2824 Tue, 02 Dec 2025 03:24:03 +0000 Hi Senthil,
I will have this fixed shortly on the dev branch.

Best Regards,
Jim

]]> 0 873a00533fc25eef5126abac143bc329 Jim Lewis replied to the topic Osvvm LocalScriptsDefault.tcl location in the forum OSVVM https://osvvm.org/forums/topic/osvvm-localscriptsdefault-tcl-location#post-2822 Mon, 01 Dec 2025 19:40:35 +0000 Hi Senthil
OutputHomeDirectory is not the correct variable to be setting.
Please use OutputBaseDirectory.

I have tested it with settings as follows. In both of these the results are in the $CurrentSimulationDirectory.
variable OutputBaseDirectory “”
variable OutputBaseDirectory “osvvm”

I have not tested it with other than these…[Read more]

]]> 0 5434dfd71a9402a382595c34358acff7 Jim Lewis replied to the topic Using OSVVM in Vivado in the forum OSVVM https://osvvm.org/forums/topic/using-osvvm-in-vivado#post-2819 Fri, 28 Nov 2025 04:54:38 +0000 Hi Jon,
I recommend getting all of OsvvmLibraries. Then from the Script_user_guide.pdf, to start XSIM, do the following:

1.3.9 Xilinx XSIM
Using OSVVM in Xilinx XSIM is under development. So far, Xilinx seems to be able to
compile OSVVM utility library, however, we have not had any of our internal test cases
pass.
To run OSVVM scripts in XSIM,…

[Read more]

]]> 0 57206c1f844f5fac65e1617c1a9a8109 Jim Lewis wrote a new post https://osvvm.org/?p=2816 Tue, 25 Nov 2025 06:56:55 +0000 Upcoming OSVVM Class SessionsAccelerate your path to adopting OSVVM.  OSVVM training is available on-line and on-site. Class details are here On-line classes are live sessions with […]

]]> 0 b7dca61105d81a3816f80400fdc5fcbc Jim Lewis replied to the topic Osvvm LocalScriptsDefault.tcl location in the forum OSVVM https://osvvm.org/forums/topic/osvvm-localscriptsdefault-tcl-location#post-2814 Sat, 22 Nov 2025 14:48:24 +0000 Hi Senthil,
Settings have been changed through time. What I say here pertains to the current release, 2025.06a. Typically I try to keep changes backward compatible.

You will find how to for OSVVM’s tcl and vhdl settings documented in OsvvmSettings_user_guide.pdf in OsvvmLibraries/Documentation. With respect to finding the settings files, it…[Read more]

]]> 0 0f1eaae2199f3082e56c8d11f32048a1 Jim Lewis replied to the topic Setting tKeep per transaction using Send in the forum OSVVM https://osvvm.org/forums/topic/setting-tkeep-per-transaction-using-send#post-2807 Tue, 18 Nov 2025 00:09:26 +0000 Hi Senthil,
The next thing to know is that every feature in OSVVM VC is tested. That is why our test suite has so many test cases. Test cases for AxiStream are in the directory, OsvvmLibraries/AXI4/AxiStream/TestCases. A search for UU finds that test cases that test this capability:

TbStream_ByteHandling1.vhd – tests using X”UU” and X”WW” in…[Read more]

]]> 0 4cffa51196cadf0efd29aa71981c1a56 Jim Lewis replied to the topic Setting tKeep per transaction using Send in the forum OSVVM https://osvvm.org/forums/topic/setting-tkeep-per-transaction-using-send#post-2805 Mon, 17 Nov 2025 22:03:53 +0000 Hi Senthil
See OsvvmLibraries/Documentation/AxiStream_user_guide.pdf:

7.3 Setting and Checking TKeep and TStrb
On the AxiStream interface, a TStrb value that corresponds to a data value of ‘1’ indicates the value
contains valid data. A value of ‘0’ indicates it is a filler value. A TKeep value of ‘1’ indicates the value is
either valid data or a…[Read more]

]]> 0 9f5976a1633494d66c38ff350f7c7a5b Jim Lewis replied to the topic Scoreboard Push Index Not In Range Error in the forum OSVVM https://osvvm.org/forums/topic/scoreboard-push-index-not-in-range-error#post-2802 Wed, 12 Nov 2025 19:46:32 +0000 Hi Minteng,
When an ID has a value of -2**31 (-2147483648), it has not been initialized yet.
OSVVM VC, such as AxiStream, initialize the TransRec.BurstFifo signal at time 0 ns delta cycle 1,
so it is not valid until time 0 ns delta cycle 2.

Are you working with an OSVVM VC or one of your own? If it is an OSVVM VC, time is either 0 ns
or the…[Read more]

]]> 0 2f10b8d137b0894fc56e76258f7b58b7 Jim Lewis replied to the topic Vivado : Error with AXI Data width in the forum OSVVM https://osvvm.org/forums/topic/vivado-error-with-axi-data-width#post-2795 Mon, 27 Oct 2025 16:54:32 +0000 Hi Remy,
Can you share exactly what you updated? Is it a particular OSVVM testbench or one of your own.

The test cases that do bursts as words will not work as they likely have dependencies on a specific size interface. The test cases that do bursts as bytes are expected to work though.

Best Regards,
Jim

]]> 0 33c99c740784047761380b58892662d7 Jim Lewis replied to the topic OSVVM: Build part of design and run only single test in the forum OSVVM https://osvvm.org/forums/topic/osvvm-build-part-of-design-and-run-only-single-test#post-2792 Sun, 19 Oct 2025 19:02:52 +0100 Hi Hassan,
What version of OSVVM are you using? The current version is 2025.06a.
What simulator and version are you using?

> 1. When only the testbench code was compiled. Why did it say “failed”?
Perhaps you can share the log files with me so I can look at it. Ultimately I need a reproducer test case of this.
Also try puts $::…[Read more]

]]> 0 563d3e27b09d5037d6a2f7f2acbfc826 Jim Lewis replied to the topic Weird QuestaSim Base Error in the forum OSVVM https://osvvm.org/forums/topic/weird-questasim-base-error#post-2790 Thu, 16 Oct 2025 19:35:16 +0100 Hi Nigel,
In the OSVVM 2024.09 and 2025.02 releases, the 2019 compile switch was turned on if the Questa release is greater than 2024.2. With the OSVVM 2025.04a release and beyond the 2019 switch it is turned back off again. So I recommend getting the newest release of OSVVM (2025.06a) and this problem is resolved.

In Questa, your issue is…[Read more]

]]> 0 17137605483ac5eb52bc5f5adb5b7d1d Jim Lewis replied to the topic Weird QuestaSim Base Error in the forum OSVVM https://osvvm.org/forums/topic/weird-questasim-base-error#post-2789 Thu, 16 Oct 2025 19:35:15 +0100 Hi Nigel,
In the OSVVM 2024.09 and 2025.02 releases, the 2019 compile switch was turned on if the Questa release is greater than 2024.2. With the OSVVM 2025.04a release and beyond the 2019 switch it is turned back off again. So I recommend getting the newest release of OSVVM (2025.06a) and this problem is resolved.

In Questa, your issue is…[Read more]

]]> 0 84e83a8ff32dc47a7768b062dd8ba41d Jim Lewis replied to the topic Safer Check if Simulation passed or Not in the forum OSVVM https://osvvm.org/forums/topic/safer-check-if-simulation-passed-or-not#post-2786 Tue, 14 Oct 2025 17:00:07 +0100 Hi Mikael,
This is a good point. In VHDL-2019, we put things in that will allow OSVVM to collect error information from VHDL and PSL assertions. Sounds like a great addition for the next release.

Do you know which version of Questa started supporting the following subprograms from std.env:
For VHDL Asserts:
GetVhdlAssertCount,…[Read more]

]]> 0 e0b20afa1d4fdf645b4bc1e9e7c7c365 Jim Lewis replied to the topic Handling expected failures in the forum OSVVM https://osvvm.org/forums/topic/handling-expected-failures#post-2776 Sat, 27 Sep 2025 14:50:37 +0100 Hi Mikkie
Use a negative value in the ExternalErrors parameter to EndOfTestReports. For example if you have 3 expected errors:

EndOfTestReports(ExternalErrors => (FAILURE => 0, ERROR => -3, WARNING => 0)) ;

The value is summed up with its corresponding field, then the absolute value is taken, and finally the separate values are summed to…[Read more]

]]> 0 25f85263d4142375d9a81cb7468f1904 Jim Lewis replied to the topic Request for estimated release window of Avalon MM in the forum OSVVM https://osvvm.org/forums/topic/request-for-estimated-release-window-of-avalon-mm#post-2768 Tue, 02 Sep 2025 14:45:12 +0100 Hi Marvin,
What Avalon MM capability are you looking for? Basic access is easy – registers. The curious and clever pipelining modes looked challenging when I looked at the interface. If you could enumerate what you need, it may break it loose.

Currently I am tied up working on Questa scripts due to their decision to make numerous…[Read more]

]]> 0 48fd410df5b79cf6c5a30c3f40764f20 Jim Lewis replied to the topic Using WaitForTransaction/RequestTransaction in a testbench in the forum OSVVM https://osvvm.org/forums/topic/using-waitfortransaction-requesttransaction-in-a-testbench#post-2762 Mon, 11 Aug 2025 16:29:58 +0100 Hi Francois,
Look at package OsvvmLibraries/Common/src/StreamTransactionPkg.vhd and see StreamRecType.
Note that each type in there is either a special type from OSVVM’s ResolutionPkg (see OsvvmLibraries/osvvm)
or by creating a custom resolution function, as was done for the enumerated type, StreamOperationType,
that was defined in the package.…[Read more]

]]> 0 f0aabf0adfa2f649fa661a24e30cf2ec Jim Lewis replied to the topic Using WaitForTransaction/RequestTransaction in a testbench in the forum OSVVM https://osvvm.org/forums/topic/using-waitfortransaction-requesttransaction-in-a-testbench#post-2760 Thu, 07 Aug 2025 15:17:19 +0100 Hi Francois,
The VC in the OSVVM library use either osvvm_common.StreamTransactionPkg.StreamRecType (for send and get type transactions – used by UART, AxiStream, xMii) or osvvm_common.AddressBusTransactionPkg.AddressBusRecType (for read and write type transactions – used by Axi4Manager, Axi4Memory, DpRam, WishboneManager,…[Read more]

]]> 0 efcdc68dd0ec9633ba7efc20afc2b832 Jim Lewis wrote a new post https://osvvm.org/?p=2756 Tue, 22 Jul 2025 01:20:20 +0100 OSVVM 2025.06 The 2025.06 release adds: Build Directories Tcl procedure CreateTestCaseCommonPkg Tcl procedure RunAllTests Questa – new vs. old script flows Clock […]

]]> 0 7d0c297042f1cd5d4050f2997027f49a Jim Lewis replied to the topic All AffirmIf Pass, but OSVVM HTML Report Returns NOCHECKS in the forum OSVVM https://osvvm.org/forums/topic/all-affirmif-pass-but-osvvm-html-report-returns-nochecks#post-2747 Wed, 16 Jul 2025 14:25:44 +0100 If the CoverReport process is removed, then the “Stim” process can end with std.env.stop – which is typically how OSVVM ends the test cases.

— Stimulus Generator
Stim: process
variable RandA : RandomPType;
variable RandB : RandomPType;
variable allDone : boolean := false;
variable nCycles : natural := 0;
begin…[Read more]

]]> 0 50e5465fd8a5f3f9e5d58d31804aa33f Jim Lewis replied to the topic All AffirmIf Pass, but OSVVM HTML Report Returns NOCHECKS in the forum OSVVM https://osvvm.org/forums/topic/all-affirmif-pass-but-osvvm-html-report-returns-nochecks#post-2746 Wed, 16 Jul 2025 14:19:10 +0100 One final thing to try. If you like the Alert/AffirmIf printing, you might also like the log printing better than the vhdl Report statement. In the “Stim” process you could change these to logs:

log("Number of simulation cycles = " & to_string(nCycles));
log("Coverage holes: " & to_string(CountCovHoles(cp_A_B)));

Logs have levels.…[Read more]

]]> 0 ef92f98a01cba025750aee04f28f1662 Jim Lewis replied to the topic All AffirmIf Pass, but OSVVM HTML Report Returns NOCHECKS in the forum OSVVM https://osvvm.org/forums/topic/all-affirmif-pass-but-osvvm-html-report-returns-nochecks#post-2745 Wed, 16 Jul 2025 14:07:07 +0100 This step is recommended, but not required. Do it after you get the above running.

To get the HTML based Functional Coverage reports, you need to use the singleton rather than the older, deprecated shared variable approach.

This requires updating your architecture declarations, “InitCoverage”, “Sample”, and “CoverageReport” processes as…[Read more]

]]> 0 32b623696042dda6768a66e1d429aa77 Jim Lewis replied to the topic All AffirmIf Pass, but OSVVM HTML Report Returns NOCHECKS in the forum OSVVM https://osvvm.org/forums/topic/all-affirmif-pass-but-osvvm-html-report-returns-nochecks#post-2744 Wed, 16 Jul 2025 14:06:10 +0100 This step is recommended, but not required. Do it after you get the above running.

While I SetTestName, SetLogEnable can be called concurrently, it is more normal to call them in the process that is controlling the overall test. Currently this is the “Stim” process but we will return to this:

Stim: process
variable RandA : RandomPType;…[Read more]

]]> 0 0ea750b55f9f73b92798aebefae47c0d Jim Lewis replied to the topic All AffirmIf Pass, but OSVVM HTML Report Returns NOCHECKS in the forum OSVVM https://osvvm.org/forums/topic/all-affirmif-pass-but-osvvm-html-report-returns-nochecks#post-2742 Wed, 16 Jul 2025 13:43:52 +0100 Thanks for posting your whole testbench as it makes the issue clear.

You are calling EndOfTestReports concurrently. So it runs at time 0 ns. You do not want it to run until your test case has finished. Same goes for WriteAlertYaml and WriteAlertSummaryYaml. However, you do not need to call these or ReportAlerts as they are all called by…[Read more]

]]> 0 435631aa1437c31b53eba77167d873dd Jim Lewis started the topic Using ActiveHDL's VSimSA release 15 with OSVVM Scripting ... in the forum OSVVM https://osvvm.org/forums/topic/using-activehdls-vsimsa-release-15-with-osvvm-scripting Tue, 24 Jun 2025 13:58:03 +0100 Hi,
If you are using ActiveHDL’s VSimSA version 15 with OSVVM Scripting, please be sure to upgrade to version 16. You will be pleased. VSimSA in release 15 limited the stack space to Tcl and OSVVM’s scripts which process Yaml files ran slow. For shorter running simulations (like OSVVM regression tests), the time is significant. For your…[Read more]

]]> 0 8d8388842bebe93c19b9ba812f16279e Jim Lewis replied to the topic Unique Requirement Pass Goals For Each Test Case in the forum OSVVM https://osvvm.org/forums/topic/unique-requirement-pass-goals-for-each-test-case#post-2737 Wed, 18 Jun 2025 18:51:33 +0100 Hi Charlie,
What I suspect you are doing is that in the checker model you have created your requirements as follows:
Req1ID <= NewReqID("Req1", 1, ...) ;
Req2ID <= NewReqID("Req2", 1, ...) ;

When the build finishes with one or more tests that use this checker module is that the requirements are merged into the final report. However, that…[Read more]

]]> 0 163db9b1ebcdeb07e0b93b833f92cb68 Jim Lewis wrote a new post https://osvvm.org/?p=2728 Wed, 11 Jun 2025 03:10:55 +0100 OSVVM: VHDL's #1 Verification Methodology   The 2024 Wilson Verification survey shows that OSVVM is being used by 35% of all FPGA designers world-wide, which makes OSVVM VHDL’s #1 Verification […]

]]> 0 9979c3d9512b096370203e391748ec44 Jim Lewis replied to the topic Using VCs without the built-in Scripts - but instead VUnit in the forum OSVVM https://osvvm.org/forums/topic/using-vcs-without-the-built-in-scripts#post-2722 Mon, 02 Jun 2025 23:26:50 +0100 Hi Isaac,
I think Patrick’s solution will be the defacto solution for integration with VUnit. Particularly since he is working on generating reports too – really cool.

Before I talked to Patrick today, I worked on the script I mentioned above. For each OSVVM library, it will create a list of files associated with the library. Note the…[Read more]

]]> 0 556605086ba494ebcd509faacfa0d6b6 Jim Lewis replied to the topic Using VCs without the built-in Scripts - but instead VUnit in the forum OSVVM https://osvvm.org/forums/topic/using-vcs-without-the-built-in-scripts#post-2717 Mon, 02 Jun 2025 14:08:40 +0100 Hi Isaac,
From time to time, the OSVVM compile scripts are updated. It is hard to maintain more than one approach. The reason we developed the OSVVM scripts is to provide a better reporting mechanism. In addition the the ordinary JUnit reports, OSVVM does a more comprehensive Build summary. We also do test case summaries, functional…[Read more]

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