Open Source VHDL Verification Methodology | jon | Activity https://osvvm.org/members/beandigital/activity Activity feed for jon. Fri, 14 Aug 2026 01:10:22 +0100 https://buddypress.org/?v= en-US 30 hourly 2 d4b054564078710975807d3339c3cbcf jon started the topic Sending an array between processes in the forum OSVVM https://osvvm.org/forums/topic/sending-an-array-between-processes Tue, 14 Jul 2026 18:42:43 +0100 I have a DUT with an AXI stream input interface that accepts an Ethernet packet. I want to be able to create a testbench to generate packets and input them into the DUT. I have a procedure that accepts some input parameters and then outputs an array of values containing the packet. What would be the best way to pass this array from the generate…[Read more]

]]> 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 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 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 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 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 25edc69d7e30271daf794395613b81aa jon replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2851 Fri, 02 Jan 2026 15:08:14 +0000 Hi Jim

Thanks for fixing this.

Jon

]]> 0 7b11ab4c8ab7f9f6cb607a0a689fbee1 jon replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2848 Fri, 02 Jan 2026 09:36:23 +0000 I am not sure what I am doing wrong. I am using the latest Questa base so I am using the VSIM/VOPT flow.
I compiled GLBL into my common_tb library where are the other design files are located. It just seems the issue is with the vsim command. Having coomon_tb.glbl makes it fail with the error shown in the previous post.

vsim -c -t ps -lib…[Read more]

]]> 0 af3c7a74573e8d56562aa179d5dbc1d0 jon replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2846 Thu, 01 Jan 2026 15:16:29 +0000 To summarize I dont think its necessary to have GLBL in a seperate library. It seems as though I need to have GLBL in the vopt step but not in the vsim step. The following works, the only difference is that GLBL isnt included for the vsim step. If I use the script then it is included and the simulation wont start because of the error below.

vopt…[Read more]

]]> 0 798a3c5f7a45104824f9ed97eea6c58b jon replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2845 Thu, 01 Jan 2026 09:39:31 +0000 Hi Jim

I compliled GLBL into its own librrary but that didnt help. It seems that I need GLBL included for the vopt step but not in the simulate step. I manually added -L xilinx_glbl to the vopt command and that seemed to work. But I am not sure how I make the script add the library to vopt.

Thanks

Jon

]]> 0 2b0edd6f250b0028df70b12f905cbc30 jon replied to the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm#post-2843 Tue, 30 Dec 2025 15:04:48 +0000 It seems that the issue is to do with the Questasim vsim command. The script is doing the following

vsim -c -t ps -lib common_tb TbStream_SendGetBurst1_opt common_tb.glbl -suppress 8683 -suppress 8684

If I remove the common_tb.glbl in the above the it runs.

]]> 0 38be19f248110ddc76e65273ed020bec jon started the topic Using GLBL with OSVVM in the forum OSVVM https://osvvm.org/forums/topic/using-glbl-with-osvvm Mon, 29 Dec 2025 12:59:43 +0000 I am trying to use the Xilinx XPM library in a simulation and it needs glbl.v. I compliled it using the Xilinx source into my work library. I also added the following to my script

SetSecondSimulationTopLevel glbl

But I am getting the following warning


Warning: (vsim-3824) Optimized (MyTest_opt) and unoptimized (glbl) top-level design units…[Read more]

]]> 0 29eb00e7e29f78eb30cd0604b1e80c18 jon replied to the topic Using OSVVM in Vivado in the forum OSVVM https://osvvm.org/forums/topic/using-osvvm-in-vivado#post-2820 Fri, 28 Nov 2025 19:14:09 +0000 Hi Jim

Thanks for the explantion.

Jon

]]> 0 904b4690dab460ada2a091892d5ff71b jon started the topic Using OSVVM in Vivado in the forum OSVVM https://osvvm.org/forums/topic/using-osvvm-in-vivado Tue, 25 Nov 2025 12:59:04 +0000 I am new to OSVVM and would like to try the AXI testbench in Vivado 2024.2. Can somone explain what files I need to add to Vivado so I can then run a simultion? Is it just the files in the osvvm dir and then AXI testbeench files? Thanks

]]> 0 4bc3f47b6e03a5805a205fb5ac6e809c jon became a registered member https://osvvm.org/activity/p/10929 Sun, 16 Nov 2025 19:23:52 +0000 0