Jump to content

uvm_reg_fifo issues with set_check_on_read()


Recommended Posts

Hi all,

I'm currently facing a problem with the uvm_reg_fifo class of the uvm register layer when enabling automatic checking on reads. I'm using the uvm_reg_predictor approach with set_auto_predict(0).

In my sequence I'm using the uvm_reg_fifo::set() function within a loop statement in order to initialize the regModel fifo with data items from 0x1, 0x2 ... 0x8. Finally I'm writing all eight data items to the DUT using the uvm_reg_fifo::update() task.

After the update() the mirror of the regModel fifo contains (shows) the last value that I put in using the set() function (0x8). Now the uvm_reg_fifo::get() returns 0x1 as expected. This is the first value written to the fifo and therfore should be the first value which is read. But when using the uvm_reg_fifo::read() and having automatic checking enabled by regModel.set_check_on_read(1) I get the following uvm_error:

UVM_ERROR ../../../../../src/reg/uvm_reg.svh(2893) @ 790: reporter [RegModel] Register "regmodel.FIFO" value read from DUT (0x0000000000000001) does not match mirrored value (0x0000000000000008)

This sequence also fails when simulating the UVM example at .../uvm-1.1b/examples/simple/registers/models/fifo_reg

Why does the uvm_reg_fifo mirror shows and compares against the latest value added ? Shouldn't it compare with the first added value?

Is this as mis-interpretation of the register model from my side?

Any help is really welcome !



Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...