Sage-Tips

What is difference between uvm_config_db and uvm_resource_db?

In particular, uvm_resource_db uses a “last write wins” approach. The uvm_config_db, on the other hand, looks at where things are in the hierarchy up through end_of_elaboration, so “parent wins.” Once you start start_of_simulation, the config_db becomes “last write wins.”

What is uvm_config_db?

The uvm_config_db class provides a convenience interface on top of the uvm_resource_db to simplify the basic interface that is used for configuring uvm_component instances. uvm_config_db. All of the functions in uvm_config_db#(T) are static, so they must be called using the :: operator.

What is config DB and resource DB?

The configuration database provides access to a centralized database, where type specific information can be stored and received. Resources are stored in a database so that each resource can be retrieved by name or by type, and the database is globally accessible.

What is M_sequencer and p_sequencer in UVM?

m_sequencer is the generic uvm_sequencer pointer. it will always exist for the uvm_sequence and is initialized when the sequence is started. p_sequencer is a typed-specific sequencer pointer, created by registering the sequence to the sequencer using macros.

What is resource DB in UVM?

UVM Resource Database. Intro. The uvm_resource_db class provides a convenience interface for the resources facility. uvm_resource_db. All of the functions in uvm_resource_db#(T) are static, so they must be called using the :: operator.

What is the difference between Uvm_transaction and Uvm_sequence_item?

uvm_sequence_item provides the hooks for sequencer and sequence , So you can generate transaction by using sequence and sequencer , and uvm_transaction provide only basic methods like do_print and do_record etc .

What is UVM config DB?

UVM config Db : it is configuration data base which inherit property from UVM resource DB also it has component hierarchy, higher in hirarchy win the race if some value is being set . VLSI what to study??

Why should I use the config_DB instead of the resource_db?

That, along with some other non-intuitive behaviors of the resource_db is why you should always just use the config_db. The UVM configuration mechanism supports sharing of configurations and parameters across different testbench components. This is enabled using a configuration database called uvm_config_db.

Does UVM_resource_db overwrite the test value in build_phase?

However, using the uvm_resource_db, since build_phase () is called top-down, the env’s build_phase is called after the test’s, so the env value would overwrite the test value.

What is the difference between classes derived from UVM_object and component?

Classes derived from uvm_object have constructors with one argument, a string name. Classes derived from uvm_component have two arguments, a name and a uvm_component parent. The two `uvm_*utils macros inserts code that gives you a factory create () method that delegates calls to the constructors of uvm_object or uvm_component.