How to get config object from config db to the tb_top

UVM
,
21

In reply to saritr:

Hi saritr,

Inside testbench environment/agent component it is required to set configuration object as

uvm_config_db #(rx_agent_config)::set(null, “", “db_rx_agent_config”, m_cfg.m_rx_agent_cfg);
–>Context argument is set to null and instance name is set to "”
Which makes configuration object available to entire TB hierarchy starting from TOP module.

For getting this object inside TOP it is required to use,

// rx_fe forces and assignments
rx_config_c m_rx_cfg;
assign rx_vif.chinl2 = dut.rx_fe.child2;
initial begin
start_of_simulation_ph.wait_for_state(UVM_PHASE_STARTED);
#1;
if(!uvm_config_db #(rx_agent_config)::get(null, “”, “db_rx_agent_config”, m_rx_cfg))
begin
`uvm_fatal(“top”, “rx_agent_config not found”)
end
else begin
if (m_rx_cfg.is_active == UVM_ACTIVE)
force dut.rx_fe.x = rx_vif.x;
end
end

Please make a note of #1 delay inside initial procedural block.
Delay is required as Environment/Agent Component will set config_object in its build_phase
and for all TB components hierarchy build_phase gets executed in Top to Down order.