Hello , welcome back. In this blog spot we will try some example on config_db().
config_db() is configuration database where we are setting value from higher component and get that value in lower component.for example virtual interface in which we are setting it in top module and we retrieve it in driver and monitor components.
Example 1 : Describe how to set value in test and get that value in env class.
env.sv
class env extends uvm_env;
//---------------------------------------------------------------------------
`uvm_component_utils(env)
//---------------------------------------------------------------------------
int loop_count;
//----------------------------------------------------------------------------
function new(string name="",uvm_component parent);
super.new(name,parent);
endfunction
//----------------------------------------------------------------------------
//---------------------- build phase -----------------------------------------
function void build_phase(uvm_phase phase);
super.build_phase(phase);
if(uvm_config_db#(int)::get(null,"uvm_test_top","loop_count",loop_count))
`uvm_info("ENV",$sformatf("loop_count is %0d",loop_count),UVM_LOW)
endfunction
//----------------------------------------------------------------------------
endclass:env
test.sv
class test extends uvm_test;
//--------------------------------------------------------------------------
`uvm_component_utils(test)
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
function new(string name="",uvm_component parent);
super.new(name,parent);
endfunction
//--------------------------------------------------------------------------
env env_h;
//--------------------------------------------------------------------------
function void build_phase(uvm_phase phase);
super.build_phase(phase);
env_h = env::type_id::create("env_h",this);
uvm_config_db#(int)::set(null,"uvm_test_top","loop_count",200);
endfunction
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
task run_phase(uvm_phase phase);
phase.raise_objection(this);
`uvm_info("TEST","Running test",UVM_LOW)
#10;
phase.drop_objection(this);
endtask
//--------------------------------------------------------------------------
endclass:test
tb_pkg.sv
`ifndef TB_PKG
`define TB_PKG
`include "uvm_macros.svh"
package tb_pkg;
import uvm_pkg::*;
`include "env.sv" // environment class
`include "test.sv" // test1
endpackage
`endif
top.sv
`include "tb_pkg.sv"
module top;
import uvm_pkg::*;
import tb_pkg::*;
//----------------------------------------------------------------------------
initial begin
run_test("test");
end
//----------------------------------------------------------------------------
endmodule
/* OUTPUT
# KERNEL: UVM_INFO /home/runner/env.sv(17) @ 0: uvm_test_top.env_h [ENV] loop_count is 200
# KERNEL: UVM_INFO /home/runner/test.sv(34) @ 0: uvm_test_top [TEST] Running test
*/Link : https://www.edaplayground.com/x/JSS_
Example 2 : From test set value of loop_count and get that value in env , agent1 , agen2 classes.
agent1.sv
class agent1 extends uvm_agent;
//----------------------------------------------------------------------------
`uvm_component_utils(agent1)
//----------------------------------------------------------------------------
int loop_count;
//----------------------------------------------------------------------------
function new(string name="",uvm_component parent);
super.new(name,parent);
endfunction
//----------------------------------------------------------------------------
//---------------------- build phase -----------------------------------------
function void build_phase(uvm_phase phase);
super.build_phase(phase);
if(uvm_config_db#(int)::get(null,"uvm_test_top","loop_count",loop_count))
`uvm_info("AGENT1",$sformatf("loop_count is %0d",loop_count),UVM_LOW)
endfunction
//----------------------------------------------------------------------------
endclass:agent1
agent2.sv
class agent2 extends uvm_agent;
//----------------------------------------------------------------------------
`uvm_component_utils(agent2)
//----------------------------------------------------------------------------
int loop_count;
//----------------------------------------------------------------------------
function new(string name="",uvm_component parent);
super.new(name,parent);
endfunction
//----------------------------------------------------------------------------
//---------------------- build phase -----------------------------------------
function void build_phase(uvm_phase phase);
super.build_phase(phase);
if(uvm_config_db#(int)::get(null,"uvm_test_top","loop_count",loop_count))
`uvm_info("AGENT2",$sformatf("loop_count is %0d",loop_count),UVM_LOW)
endfunction
//----------------------------------------------------------------------------
endclass:agent2
Rest of code is similar to example1
/* OUTPUT
# KERNEL: UVM_INFO /home/runner/env.sv(22) @ 0: uvm_test_top.env_h [ENV] loop_count is 200
# KERNEL: UVM_INFO /home/build/vlib1/vlib/uvm-1.2/src/base/uvm_resource_db.svh(121) @ 0:
reporter [CFGDB/GET] Configuration 'uvm_test_top.loop_count' (type bit signed[31:0]) read by
= (bit signed[31:0]) 200
# KERNEL: UVM_INFO /home/runner/agent1.sv(17) @ 0: uvm_test_top.env_h.ag1 [AGENT1] loop_count
is 200
# KERNEL: UVM_INFO /home/build/vlib1/vlib/uvm-1.2/src/base/uvm_resource_db.svh(121) @ 0:
reporter [CFGDB/GET] Configuration 'uvm_test_top.loop_count' (type bit signed[31:0]) read by
= (bit signed[31:0]) 200
# KERNEL: UVM_INFO /home/runner/agent2.sv(17) @ 0: uvm_test_top.env_h.ag2 [AGENT2] loop_count
is 200
# KERNEL: UVM_INFO /home/runner/test.sv(34) @ 0: uvm_test_top [TEST] Running test
*/
Link : https://www.edaplayground.com/x/NGy9
UVM TB FOR ADDER USING CONFIG_DB : EXAMPLE
Adder Architecture is shown below in which concept of configuration database is used.
adder_env and adder_agent has get() method for config_db().
adder_test.sv
class adder_test extends uvm_test;
//--------------------------------------------------------------------------
`uvm_component_utils(adder_test)
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
function new(string name="adder_test",uvm_component parent);
super.new(name,parent);
endfunction
//--------------------------------------------------------------------------
adder_env env_h;
int file_h;
//////////////////////////////// CONFIGURATION /////////////////////////////
bit agent_is_active = 1;
bit has_coverage = 1;
bit has_scoreboard = 1;
////////////////////////////////////////////////////////////////////////////
adder_sequence seq;
adder_add_zero_in1 seq1_1;
adder_add_zero_in1 seq1_2;
adder_add_zero_in2 seq2_1;
adder_add_zero_in2 seq2_2;
add_F seq3_1;
add_F seq3_2;
reset rst;
//--------------------------------------------------------------------------
function void build_phase(uvm_phase phase);
super.build_phase(phase);
env_h = adder_env::type_id::create("env_h",this);
uvm_config_db#(bit)::set(null,"uvm_test_top","agent_is_active",agent_is_active);
uvm_config_db#(bit)::set(null,"uvm_test_top","has_coverage", has_coverage);
uvm_config_db#(bit)::set(null,"uvm_test_top","has_scoreboard", has_scoreboard);
seq =adder_sequence::type_id::create("seq");
seq1_1=adder_add_zero_in1::type_id::create("seq1_1");
seq1_2=adder_add_zero_in1::type_id::create("seq1_2");
seq2_1=adder_add_zero_in2::type_id::create("seq2_1");
seq2_2=adder_add_zero_in2::type_id::create("seq2_2");
seq3_1=add_F::type_id::create("seq3_1");
seq3_2=add_F::type_id::create("seq3_2");
rst =reset::type_id::create("rst");
endfunction
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
function void end_of_elobartion_phase(uvm_phase phase);
//super.end_of_elobartion_phase(phase);
//factory.print();
$display("End of eleboration phase in agent");
endfunction
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
function void start_of_simulation_phase(uvm_phase phase);
//super.start_of_simulation_phase(phase);
$display("start_of_simulation_phase");
file_h=$fopen("LOG_FILE.log","w");
set_report_default_file_hier(file_h);
set_report_severity_action_hier(UVM_INFO,UVM_DISPLAY+UVM_LOG);
set_report_verbosity_level_hier(UVM_LOW);
seq.loop_count=100;
endfunction
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
task run_phase(uvm_phase phase);
phase.raise_objection(this);
// seq.start(env_h.agent_h.sequencer_h);
rst.start(env_h.agent_h.sequencer_h);
seq.start(env_h.agent_h.sequencer_h);
seq3_1.start(env_h.agent_h.sequencer_h);
seq1_1.start(env_h.agent_h.sequencer_h);
seq2_1.start(env_h.agent_h.sequencer_h);
#10;
phase.drop_objection(this);
endtask
//--------------------------------------------------------------------------
endclass:adder_test
adder_env.sv
class adder_env extends uvm_env;
//---------------------------------------------------------------------------
`uvm_component_utils(adder_env)
//---------------------------------------------------------------------------
//----------------------------------------------------------------------------
function new(string name="",uvm_component parent);
super.new(name,parent);
endfunction
//----------------------------------------------------------------------------
//-------------------- class handles -----------------------------------------
adder_agent agent_h;
adder_coverage coverage_h;
adder_scoreboard scoreboard_h;
//----------------------------------------------------------------------------
bit has_scoreboard;
bit has_coverage;
//---------------------- build phase -----------------------------------------
function void build_phase(uvm_phase phase);
super.build_phase(phase);
agent_h = adder_agent::type_id::create("agent_h",this);
if(uvm_config_db#(bit)::get(null,"uvm_test_top","has_scoreboard",has_scoreboard))
`uvm_info(get_type_name(),"HAS SCOREBOARD value get",UVM_LOW)
else begin
`uvm_error(get_type_name(),"Not getting has scoreboard")
end
if(uvm_config_db#(bit)::get(null,"uvm_test_top","has_coverage",has_coverage))
`uvm_info(get_type_name(),"HAS COVERAGE value get",UVM_LOW)
else begin
`uvm_error(get_type_name(),"Not getting has coverage")
end
if(has_coverage==1) begin
coverage_h = adder_coverage::type_id::create("coverage_h",this);
end
if(has_scoreboard==1) begin
scoreboard_h = adder_scoreboard::type_id::create("scoreboard_h",this);
end
endfunction
//----------------------------------------------------------------------------
//-------------------------- connect phase -----------------------------------
function void connect_phase(uvm_phase phase);
super.connect_phase(phase);
if(has_coverage==1) begin
agent_h.monitor_h.ap_mon.connect(coverage_h.analysis_export);
end
if(has_scoreboard==1) begin
agent_h.monitor_h.ap_mon.connect(scoreboard_h.aport_mon);
agent_h.driver_h.drv2sb.connect(scoreboard_h.aport_drv);
end
endfunction
//----------------------------------------------------------------------------
endclass:adder_env
adder_agent.sv
class adder_agent extends uvm_agent;
//----------------------------------------------------------------------------
`uvm_component_utils(adder_agent)
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
function new(string name="",uvm_component parent);
super.new(name,parent);
endfunction
//----------------------------------------------------------------------------
bit agent_is_active;
//----------------- class handles --------------------------------------------
adder_sequencer sequencer_h;
adder_driver driver_h;
adder_monitor monitor_h;
//----------------------------------------------------------------------------
//---------------------- build phase -----------------------------------------
function void build_phase(uvm_phase phase);
super.build_phase(phase);
if(uvm_config_db#(bit)::get(null,"uvm_test_top","agent_is_active",agent_is_active))
`uvm_info(get_type_name(),"AGENT IS ACTIVE value get",UVM_LOW)
else begin
`uvm_error(get_type_name(),"Not getting agent_is_active")
end
monitor_h = adder_monitor::type_id::create("monitor_h",this);
if(agent_is_active==1) begin
driver_h = adder_driver::type_id::create("driver_h",this);
sequencer_h = adder_sequencer::type_id::create("sequencer_h",this);
end
endfunction
//----------------------------------------------------------------------------
//----------------------- connect phase --------------------------------------
function void connect_phase(uvm_phase phase);
super.connect_phase(phase);
driver_h.seq_item_port.connect(sequencer_h.seq_item_export);
endfunction
//----------------------------------------------------------------------------
endclass:adder_agent
Link for complete TB https://www.edaplayground.com/x/X8u2
Thank you for reading , i will update more examples on config_db .
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