Open Source VHDL Verification Methodology | Site-Wide Activity https://osvvm.org/activity Activity feed for the entire site. Sun, 26 Apr 2026 00:21:41 +0100 https://buddypress.org/?v= en-US 30 hourly 2 18e38174a548cabd00fb55b88c6411ed DanielGof became a registered member https://osvvm.org/activity/p/11077 Sat, 25 Apr 2026 14:09:19 +0100 0 7c0abe2717ce7c125a333af03ddb8faf Greg became a registered member https://osvvm.org/activity/p/11076 Fri, 24 Apr 2026 15:31:13 +0100 0 3ed2faca8521897a673f4c0c11d1cd77 Magdalena became a registered member https://osvvm.org/activity/p/11075 Wed, 22 Apr 2026 15:41:13 +0100 0 b696233a13a9133560488fdd4af2d26f jon 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-2910 Sun, 19 Apr 2026 18:12:28 +0100 Hi Jim

I am using the AXI memory model. I think it is all working as it should. I actually tried using the ‘-‘ in the scoreboard data for the inactive bytes. I then used check() and it worked well.
Thanks
Jon

]]> 0 6fbf7d5e7a392f802ea3ee839a284e58 Álvaro became a registered member https://osvvm.org/activity/p/11073 Sat, 18 Apr 2026 15:14:24 +0100 0 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 cc216128ee59d79c0545dcb505c9e7de Rubén became a registered member https://osvvm.org/activity/p/11071 Thu, 16 Apr 2026 19:01:32 +0100 0 9d27deeb364c03128382a7b0e834e766 jon 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-2908 Wed, 15 Apr 2026 14:48:28 +0100 I just created a function to sero out the unused bytes in the read data and scoreboard data.

]]> 0 987d75d425874754e8bff500617962b2 jon replied to the topic Problem simulating with genrics in the forum OSVVM https://osvvm.org/forums/topic/problem-simulating-with-genrics#post-2907 Wed, 15 Apr 2026 10:42:38 +0100 It looks like the problem was that I was defining the generic as a default value in the testbench top. Doing that I needed to use the -G option. If i delete that statement then the -g option works.

]]> 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 332108e93fbc087e887640cd02b6eb04 jon replied to the topic Problem simulating with genrics in the forum OSVVM https://osvvm.org/forums/topic/problem-simulating-with-genrics#post-2905 Tue, 14 Apr 2026 18:23:27 +0100 Setting it to -G solved the problem.
Thanks
Jon

]]> 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 b791b63eafdd5d0d3c216892ae138eac jon 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-2903 Tue, 14 Apr 2026 16:41:11 +0100 But actually I still have the same issue at the end of the burst if the bytes arent a multiple of the bus width.

]]> 0 2b687ba086c7ff12dbea1e146dcb1d26 jon 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-2902 Tue, 14 Apr 2026 16:29:31 +0100 I just realized that I can read the AXI memory using a byte address which then shifts the data into the correct position.

]]> 0 80aa86ba1b7fc160e654eb070488d1d3 jon started the topic Checking AXI data when using WSTRB in the forum OSVVM https://osvvm.org/forums/topic/checking-axi-data-when-using-wstrb Tue, 14 Apr 2026 15:28:59 +0100 I am using the AXI memory to write a burst. The first beat has the WSTRB set to 1110 (first byte no used). I am using a scoreboard to check the data, and I set the expected data to be 020100UU. But when I call check the scoreboard fails. It seems to be checking the full value rather than only the three active bytes. Is this the correct way to do…[Read more]

]]> 0 50782d6ae86d928e4d7aec6b87e4f43f jon 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-2900 Tue, 14 Apr 2026 15:25:39 +0100 Hi Jim

Yes that was the issue.
Thanks
Jon

]]> 0 42a42cec33fdd6c92599c4bf9614c68f jon replied to the topic Problem simulating with genrics in the forum OSVVM https://osvvm.org/forums/topic/problem-simulating-with-genrics#post-2899 Tue, 14 Apr 2026 15:24:43 +0100 Hi Jim
Sorry for the delay.
The genric is in the testbench file where all items are instantiated (DUT, AXI compoents etc).
Thanks
Jon

]]> 0 28d387779d129058ab47f6c74dabddc7 Jerome replied to the topic Issue with xMiiMacTransmitter.vhd in the forum OSVVM https://osvvm.org/forums/topic/issue-with-xmiimactransmitter-vhd#post-2896 Thu, 02 Apr 2026 13:46:08 +0100 Hi Jim,

I agree with you, all 3 files had the same error.

Thanks,
Best Regards,
Jerome

]]> 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 0479f2542c34ee13b147728408e4bd2d David started the topic NVC Simulation Error in the forum OSVVM https://osvvm.org/forums/topic/nvc-simulation-error Wed, 25 Mar 2026 15:31:12 +0000 Hello Jim,

I’m not sure if this is an OSVVM issue, a QuestaSim issue or an NVC issue, could you help me identify where/if this should be raised please? or if my VHDL is wrong that is using OSVVM.

This code runs successfully in Questa but gives an error when run in NVC:

** Error: type of index BOOLEAN does not match type of array dimension…[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 b07891e090464a3b75fc72b92ec0573a jon started the topic Problem simulating with genrics in the forum OSVVM https://osvvm.org/forums/topic/problem-simulating-with-genrics Sat, 14 Mar 2026 15:41:28 +0000 I am trying to change a generic in my testbench when I start the simulation (using Questasim base). I am using the following script :-
TestName tb_test1
analyze tb_test1.vhd +acc
simulate tb_test1 [generic USE_ADV_MODE 1]
I get the following output from the simulator
vopt {*}-work dma_mm2s -L dma_mm2s tb_test1 common.glbl -o tb_test1_opt…[Read more]

]]> 0 3508ca79d035755b0b2547ad7213585f jon 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-2887 Fri, 13 Mar 2026 19:33:07 +0000 I found the issue. The problem was that the reset was undefined right at the start which was causing some issues.

]]> 0 fe86e39f1ec44ca3094b76736c866303 jon started the topic Problem with the AXI stream receiver in the forum OSVVM https://osvvm.org/forums/topic/problem-with-the-axi-stream-receiver Fri, 13 Mar 2026 18:56:38 +0000 I am using the AXI stream receiver to receive data from a DMA controller. I am using Get to read values from it. The problem I am seeing is that I am reading two words of all zeros before I get any activity on the AXI stream receiver. Once I get data then I can read that fine. But I dont understand why I am getting these two values. I do call Get…[Read more]

]]> 0 da3cfe394752bcc12bb7577836eeb422 David replied to the topic Combining Results from Multiple Runs into One HTML Report in the forum OSVVM https://osvvm.org/forums/topic/combining-results-from-multiple-runs-into-one-html-report#post-2885 Wed, 11 Mar 2026 07:24:45 +0000 Hello Mikkie, sorry for not seeing your question.

To merge results:
vcover merge merged.ucdb run1.ucdb run2.ucdb run3.ucdb

Then the normal “report” to view the combined report:
vcover report merged.ucdb

Note, the VHDL has to be identical otherwise you’re trying to merge results that are not aligned, I think Questa gives an error.

]]> 0 ce4d2699abf918253c93743ebcf3a2aa Jerome started the topic Issue with xMiiMacTransmitter.vhd in the forum OSVVM https://osvvm.org/forums/topic/issue-with-xmiimactransmitter-vhd Fri, 06 Mar 2026 13:20:04 +0000 Hello,
I’m new to using the OSVVM libraries,
and I’m trying to use the VC Ethernet model (xMiiMacTransmitter.vhd).
It seems to me there’s an error in the clock generation process (ClkProc).
The tperiod_xClk signal takes a period value calculated according to the configuration (I agree with that),
but the RefGtxClk signal changes state after this…[Read more]

]]> 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 f452838504e289af246458cba3771a7d Jerome became a registered member https://osvvm.org/activity/p/11045 Thu, 05 Mar 2026 00:28:15 +0000 0 ca1334c94e57d1f2f22b5571d12e2265 Matthias Alles 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-2881 Tue, 03 Mar 2026 21:08:25 +0000 OK, I just checked, this seems to be a regression in XSIM. It works in 2024.2.2 as well as 2025.1.

]]> 0 d74421e1a3c83810aa5b52a6b86e912d Matthias Alles started 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 Tue, 03 Mar 2026 20:51:57 +0000 Hi,
I’m having an issue with OSVVM in XSIM. I have a procedure that uses a CovPType as inout parameter, similar to the CompareBins procedure in CoveragePkg. XSIM gives me this error for my procedure as well as for the CompareBins procedure of the CoveragePkg:

FATAL_ERROR: Vivado Simulator kernel has discovered an exceptional condition from which…

[Read more]

]]> 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 306679726b5a2c4c1de77ecd18ddaf73 Amine, Adel 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-2875 Sat, 21 Feb 2026 21:51:42 +0000 Hi Jim,

Thanks for the information!

I’ve actually switched to using the built-in JUnit GitHub Action for test reporting. In this setup, I simply specify the location of the XML report files, and the action handles the rest.

Here is the current method I’m using:


# Setup OSVVM and launch simulation
- name: Run Simulation
run: |
cd $GI…[Read more]

]]> 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 e358fa5cdcbf192a6ad448604d8c4895 Mario became a registered member https://osvvm.org/activity/p/11038 Thu, 19 Feb 2026 10:11:05 +0000 0 d830521ca27521ccf4c0f4569ec3d8ca Patrick 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-2868 Sat, 14 Feb 2026 20:41:23 +0000 There is also pyEDAA.OSVVM for reading OSVVM’s YAML files (or XML files). You get a data model where you can access fields and aggregated files as well as status properties.

See https://github.com/edaa-org/pyEDAA.OSVVM

]]> 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 a812e4afe23119a2aac224ee3de2fa1d Maximilian became a registered member https://osvvm.org/activity/p/11031 Mon, 02 Feb 2026 12:24:49 +0000 0 9551533346dcac25a97bc6276405644d Dawson became a registered member https://osvvm.org/activity/p/11030 Wed, 28 Jan 2026 15:25:59 +0000 0 d78fc8469b550270a0279417e1e453ec Andy's profile was updated https://osvvm.org/activity/p/11029 Wed, 28 Jan 2026 08:55:58 +0000 0 9f0387fb9098a6f5cf8ba69f1dec776d Luca became a registered member https://osvvm.org/activity/p/11028 Mon, 26 Jan 2026 16:58:36 +0000 0 00f70f7cf63d8f69e4ceb3e2da1a9095 Michal became a registered member https://osvvm.org/activity/p/11027 Mon, 26 Jan 2026 11:29:50 +0000 0 8bb404dddee1a84991e457284a874342 Michael became a registered member https://osvvm.org/activity/p/11026 Fri, 23 Jan 2026 14:07:03 +0000 0 d1302737c78014e3d5f7d00a5d99c037 Guus became a registered member https://osvvm.org/activity/p/11022 Wed, 21 Jan 2026 07:54:11 +0000 0 5344a3ea65cdf88c33840650011da0c1 Eliseo became a registered member https://osvvm.org/activity/p/11021 Tue, 20 Jan 2026 21:49:15 +0000 0 0d260a31fb86d157fc963eba88fedb0a Amine, Adel changed their profile picture https://osvvm.org/activity/p/11018 Sun, 18 Jan 2026 13:25:10 +0000 0 0a34c62c7a5e8960bfc3eb0696af08cf Amine, Adel 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-2862 Sat, 17 Jan 2026 21:35:02 +0000 Hi Jim,

Thanks for the detailed explanation and references to the OSVVM settings.

I’ve built a CI framework using GitHub Actions, running ModelSim on an Ubuntu runner. I’ll publish the template once the framework is complete. In my setup:

Initialize OSVVM and build the library via build.pro (example included in the template):

library osv…[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]

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