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In the env, there is such uvm_config_db::set(): for (int i = 0; i < host_num; i++) begin inst_name = $sformatf("*.v_seq.slv_seq[%0d]", i); uvm_config_db#(uvm_event)::set(uvm_root::get(), inst_name, "evt", env.subenv[i].slv_agt.slv_mon.evt); end in the slv_seq, there is such uvm_config_db::get(): if(!uvm_config_db#(uvm_event)::get(null, this.get_full_name(), "evt", evt)) `uvm_fatal("NOEVT",{"evt must be set for: ",get_full_name(),".evt"}); When I use +UVM_CONFIG_DB_TRACE, I found such message: UVM_INFO /EDA_Tools/synopsys/vcs1209/etc/uvm-1.1/uvm-1.1d/src/base/uvm_resource_db.svh(121) @ 2580000: reporter [CFGDB/GET] Configuration 'uvm_test_top.env.v_sqr.v_seq.slv_seq[k]evt' (type class uvm_pkg::uvm_event) read by = null (failed lookup) If I uvm_config_db::set() in slv_mon like this: uvm_config_db#(uvm_event)::set(uvm_root::get(), "*", "evt",evt); there isn't such message, I think it configures successfully. there are multiple slv_mon and slv_seq instances, when there is only one valid slv_mon and slv_seq, the evt cann't pass successfully when it triggered. So I want to config evt of slv_mon to slv_seq using the bijective way. It isn't success at the moment, can anybody tell me the graceful way? Thanks in advance mrforever