use of set and get in sequence

[amitrana]

Hi UVM WORLD,

I wanna know which approach is better

(1) using config_db in sequence for setting control parameter in UVC

OR

(2) Concept of virtual Sequencer.

[jadec]

For reuse, it's always better to control things top-down. If you start using global variables, full hierarchical paths to components, or accessing up to a parent (aside for sequence accessing it's p_sequencer), it will become difficult to reuse the components outside of that environment.

Generally, you'd use the config for static or semi-static controls and sequences or virtual sequences for more dynamic and interactive controls.

[phuynh]

In addition to what Jade mentioned, uvm_config_db::set/get is normally done during the build_phase and/or the connect_phase to control/get the static parameters of the UVC.

[amitrana]

Hi,

Thanks all.

[SeanChou]

Phuynh,

Do you also suggest users to use uvm_config_db during run phases, if yes, why? if not, is there any suggested alternative for it and thanks!

[phuynh]

Yes, you can also use uvm_config_db::get() in the run_phase to get values for variables set from a higher-level component. The set() is normally done in the test or the uvm_env before the run_phase (e.g, build_phase) as part of configuring the testbench and "tuning the knobs".

Phuynh,

Do you also suggest users to use uvm_config_db during run phases, if yes, why? if not, is there any suggested alternative for it and thanks!