Jump to content
Sign in to follow this  
Parth1242

uvm_event with uvm1.2

Recommended Posts

With UVM1.2 uvm_event class is made parameterized , but I am not able to use it for types other than extend class of uvm_object. I am running with IUS simulator.

Getting Error , because virtual function void trigger (T data=null);  , expects type to be object . Is there a way to use it for string/integer/bit ? 

Share this post


Link to post
Share on other sites
5 hours ago, uwes said:

unless you wrap the string/int/bit in a class instance this will not work. 

Even If I use class object which is not extended from uvm_object , it is not working with IUS. It fails in compilation error from uvm library file. So what is change in uvm 1.2 ? it is same behavior as uvm 1.1.

 

Share this post


Link to post
Share on other sites

I just ran into this anomaly today.  Here's the fix, if you want to use a “uvm_event#(bit)” type:

1) Copy uvm_event.svh and uvm_event_callback.svh to your project area where you can "enhance" it.  I renamed the files and classes to include a "fixed_" prefix, thus uvm_event class is now fixed_uvm_event class.

.../common/fixed_uvm_event.svh

2) Change all occurrences of “uvm_event” to “fixed_uvm_event” in both files: fixed_uvm_event.svh and fixed_uvm_event_callback.svh

Thus:

class fixed_uvm_event#(type T=bit) extends fixed_uvm_event_base#(T);

3) Change the default type T to "bit" (or whatever your base type is going to be) in both classes in fixed_uvm_event.svh

virtual class fixed_uvm_event_base#(type T=bit) extends uvm_object;

class fixed_uvm_event#(type T=bit) extends fixed_uvm_event_base#(T);

I haven’t figured out why the VCS compiler doesn’t resolve this error (I’ll save it for another rainy day)

    Error-[SV-ICVA] Illegal class variable access

    .../common/fixed_uvm_event.svh, 263

      Protected member 'm_event' of class

      'fixed_uvm_event_base#(uvm_pkg::uvm_object)' is not visible to scope

      'fixed_uvm_event_base#(bit)'.

      Please make sure that the above member is accessed only from its own class or inherited class properties as it is declared as protected.

4) Add type T to the callbacks queue in the base class:

protected fixed_uvm_event_callback#(T)  callbacks[$];

5) Comment out “do_print()” and “do_copy()” and hope you don’t need them.

OK, I should have used the "mutated_" prefix instead of "fixed_" because it's not really fixed.

Good Luck, Mr V

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×