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Hello Everyone, I am trying to control a sub virtual sequencer's non-virtual sub sequencers using a top level virtual sequencer. It looks like this diagram. <start of diagram> .------------------------------------------------------. | my_test | .--------------------------------------------------. | | | sequences | | | '--------------------------------------------------' | | .--------------------------------------------------. | | | my_env | | | '--------------------------------------------------' | '/----------------------------------------------------\' / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ .----------------------------------------------------------------------------------------------------. | my_env | | .------------------------. | | | my_virtual_sequencer | | | '------------------------' | | .-----------------------------------. .----------------------------. .---------------------------. | | | sub_virtual_agent | | sub_agent_a | | sub_agent_b | | | | .-------------------------------. | | .------------------------. | | .-----------------------. | | | | | sub_virtual_sequencer | | | | sub_sequencer_a | | | | sub_sequencer_b | | | | | '-------------------------------' | | '------------------------' | | '-----------------------' | | | | .-------------------------. | | .------------------------. | | .-----------------------. | | | | | sub_agent_3 | | | | driver_a | | | | driver_b | | | | | .-------------------------. | | | '------------------------' | | '-----------------------' | | | | | sub_agent_2 | | | | .------------------------. | | .-----------------------. | | | | .---------------------------. | | | | | monitor_a | | | | monitor_b | | | | | | sub_agent_1 | | | | | '------------------------' | | '-----------------------' | | | | | .-----------------------. | | | | '----------------------------' '---------------------------' | | | | | sub_sequencer_1 | | | | | | | | | '-----------------------' | | | | | | | | .-----------------------. | | | | | | | | | driver_1 | | | | | | | | | '-----------------------' | | | | | | | | .-----------------------. | | | | | | | | | monitor_1 | | |-' | | | | | '-----------------------' |-' | | | | '---------------------------' | | | '-----------------------------------' | '----------------------------------------------------------------------------------------------------' <end of diagram> I am trying to apply section 4.8 Virtual Sequences of uvm users guide. But I think I am missing on something. I have a top level virtual sequence that has the top level virtual sequencer as its p_sequencer. I have this in the macro: `uvm_declare_p_sequencer(my_virtual_sequencer) And then I have this in the task body() to access the sub sequencer of the sub virtual sequencer: `uvm_do_on(sub_sequence_1, p_sequencer.i_sub_virtual_sequencer.i_sub_sequencer_1); sub_sequence_1 is a physical sequence. Is this correct under the UVM standard? If not, how do I properly control i_sub_sequencer_1? This is how I access it in the test build_phase: uvm_config_db #(uvm_object_wrapper)::set(this, "i_my_env,i_my_virtual_sequencer.main_phase","default_sequence",my_virtual_sequence::type_id::get()); Any help/inputs to this is much appreciated. Thanks, Martin

Hi, all, I met one problem when i configure sub-sequencers of virtual sequencer using uvm_config_db. Here are the codes and VCS reports: -------codes------- class my_subenv extends uvm_env; ... function void build_phase(uvm_phase phase); ... v_sqr = vsequencer::type_id::create($sformatf("v_sqr%0d", subenv_ID), this); // configuration, set default_sequence as the virtual sequencer uvm_config_db#(uvm_object_wrapper)::set(this, "v_sqr.run_phase", "default_sequence", vsequence::type_id::get()); ... endfunction : build_phase function void connect_phase(uvm_phase phase); ... uvm_config_db#(uvm_sequencer)::set(this, "v_sqr", "cfg_sqr", this.cfg_agt.cfg_sqr); uvm_config_db#(uvm_sequencer)::set(this, "v_sqr", "str_sqr", this.str_agt.str_sqr); ... endfunction : connect_phase ... endclass : my_subenv -------VCS reports-------- Error-[iCTTFC] Incompatible complex type usage ../sv/00_top/my_subenv.sv, 101 Incompatible complex type usage in task or function call. The following expression is incompatible with the formal parameter of the function. The type of the actual is 'class my_pkg::my_config_sequencer', while the type of the formal is 'class uvm_pkg::uvm_sequencer#(class uvm_pkg::uvm_sequence_item,class uvm_pkg::uvm_sequence_item)'. Expression: this.cfg_agt.cfg_sqr Source info: vcs_paramclassrepository::__vcs_dummy_uvm_pkg_uvm_config_db_3133241903_.set(this, "v_sqr", "cfg_sqr", this.cfg_agt.cfg_sqr) Error-[iCTTFC] Incompatible complex type usage ../sv/00_top/my_subenv.sv, 102 Incompatible complex type usage in task or function call. The following expression is incompatible with the formal parameter of the function. The type of the actual is 'class my_pkg::my_str_sequencer', while the type of the formal is 'class uvm_pkg::uvm_sequencer#(class uvm_pkg::uvm_sequence_item,class uvm_pkg::uvm_sequence_item)'. Expression: this.str_agt.str_sqr Source info: vcs_paramclassrepository::__vcs_dummy_uvm_pkg_uvm_config_db_3133241903_.set(this, "v_sqr", "str_sqr", this.str_agt.str_sqr) By the way, my_config_sequencer and my_str_sequencer are classes derived from uvm_sequencer, so I think the complex type should be compatible. And the codes are wriiten according chapter 4.8 of the uvm_users_guide_1.1.pdf document. Should there be some phrases like uvm_config_db#(uvm_sequencer)::get() in my_subenv or other places? Thanks regards mrforever