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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]

Hi Jim,

Appreciate it!. I did not look at this particular test. Searched for TKeep/TStrb. I will have a look at the test that you mentioned.

Regards,
-Senthil

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]

Hi Jim,

Thanks for the response. I did look at this section 7.3 before I sent out my request. My question is how exactly do you specify these values in the Send transaction?. Do you append the TKeep/TStrb value(WW | UU) to the Data field in Send transaction?. Looked at Param field. Param deals with TID, TDEST and TUSER and TLAST. Is there an…[Read more]

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]

Hi Jim,

Thank you for the quick response. I’m working with a custom VC. You’re right, the problem was that BurstFifo wasn’t initialized in the VC. I added the following at the beginning of the VC’s transaction handler process, and it worked.

RX_IF.BurstFifo <= NewID("RxBurstFifo", ModelID, Search => PRIVATE_NAME) ;


I appreciate the tip on…[Read more]

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]

Hi Jim,
I tested the same test case with Questasim, and I’m not seeing the same issues.

Regards,
Remy