Activity – jon – Open Source VHDL Verification Methodology

jon started the topic Sending an array between processes in the forum OSVVM 1 month ago

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]

jon replied to the topic Checking AXI data when using WSTRB in the forum OSVVM 3 months, 3 weeks ago

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

jon replied to the topic Checking AXI data when using WSTRB in the forum OSVVM 4 months ago

I just created a function to sero out the unused bytes in the read data and scoreboard data.

jon replied to the topic Problem simulating with genrics in the forum OSVVM 4 months ago

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.

jon replied to the topic Problem simulating with genrics in the forum OSVVM 4 months ago

Setting it to -G solved the problem.
Thanks
Jon

jon replied to the topic Checking AXI data when using WSTRB in the forum OSVVM 4 months ago

But actually I still have the same issue at the end of the burst if the bytes arent a multiple of the bus width.

jon replied to the topic Checking AXI data when using WSTRB in the forum OSVVM 4 months ago

I just realized that I can read the AXI memory using a byte address which then shifts the data into the correct position.

jon started the topic Checking AXI data when using WSTRB in the forum OSVVM 4 months ago

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]

jon replied to the topic Problem with the AXI stream receiver in the forum OSVVM 4 months ago

Hi Jim

Yes that was the issue.
Thanks
Jon

jon replied to the topic Problem simulating with genrics in the forum OSVVM 4 months ago

Hi Jim
Sorry for the delay.
The genric is in the testbench file where all items are instantiated (DUT, AXI compoents etc).
Thanks
Jon

jon started the topic Problem simulating with genrics in the forum OSVVM 5 months ago

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]

jon replied to the topic Problem with the AXI stream receiver in the forum OSVVM 5 months ago

I found the issue. The problem was that the reset was undefined right at the start which was causing some issues.

jon started the topic Problem with the AXI stream receiver in the forum OSVVM 5 months ago

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]

jon replied to the topic Using GLBL with OSVVM in the forum OSVVM 7 months, 1 week ago

Hi Jim

Thanks for fixing this.

Jon

jon replied to the topic Using GLBL with OSVVM in the forum OSVVM 7 months, 1 week ago

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]

jon replied to the topic Using GLBL with OSVVM in the forum OSVVM 7 months, 2 weeks ago

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]

jon replied to the topic Using GLBL with OSVVM in the forum OSVVM 7 months, 2 weeks ago

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

jon replied to the topic Using GLBL with OSVVM in the forum OSVVM 7 months, 2 weeks ago

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.

jon started the topic Using GLBL with OSVVM in the forum OSVVM 7 months, 2 weeks ago

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]

jon replied to the topic Using OSVVM in Vivado in the forum OSVVM 8 months, 2 weeks ago

Hi Jim

Thanks for the explantion.

Jon

jon

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