There is no class called ovm_component in uvm base class.Maybe the error is bcoz of this.

MY NEW_AXI_ENV
—————————————————————————————–

class my_new_env extends uvm_env;

//factory registration
`uvm_component_utils(my_new_env)

//instantiation of axi_env
axi_env axi_env_0;

//instantiation of vitual sequencer

my_virtual_sequencer vir_seqr_0;

//build
virtual function void build();

super.build();

//Disabling the master and slave sequencer
set_config_int(”*.axi_master_sequencer_0″,”count”,0);
set_config_int(”*.axi_slave_sequencer_0″,”count”,0);

//Enabling virtual_sequencer

set_config_string(”* “,”default_sequence”,my_seq);
endfunct ion

//connect
virtual function void connect( )

vir_seq_0.master_seuencencer_0= axi_env_0.master_agent_0.master_sequencer_0;
vir_seq_0.slave_sequencencer_0= axi_env_0.slave_agent_0.slave_sequencer_0;

endfunction

virual function connect( );

axi_env_0.axi_agent_0.assign_vif(top.axi_if_0);

endfunction //connect

endclass :my_new_env

Hi Sir
while building my uvm environment.
i had created my_new_env ,in which i instantiated axi_env and my virtual sequencer. .
axi_env consists of
master agent and slave agent.
but when i was simulating my code it was giving some error in uvm /src/pkg.

ONE question time to time haunting in my mind, Can i instantiate axi_env in axi_env_new as they are two child class of the same parent uvm_env. one argument regarding this question ,why can’t ,as i know that all these classes, whether uvm_driver ,uvm_sequencer and uvm_agent .these all classes extents from the same parent uvm_component .further i am instantiating the child class
which extends from these classes. in uvm_agent. it means i am doing write ,then why iam getting an error.
kindly help me .

Regards
Amit

AXI_VIRTUAL_SEQUENCER
—————————————————————————————
class my_virtual_sequencer extends uvm_sequencer#(axi_xactn);
—————————————————————————————

//factory registration

//instantiation of master sequencer
mas_seq mas_seq_0;
//instantiation of slave sequencer

//construction
function new(string name =”my_virtual_sequencer”);
super.new(name);
`update_uvm_sequencer_lib
endfuntion

endclass
———————————————————————————————–
AXI_ENV
———————————————————————————————–
class axi_env extends uvm_env;

//factory_registration
`uvm_component_utils(axi_env)

//agent_instantion
axi_agent agent_0;

//build
virtual function void build ( );
super.build();
agent_0=axi_agent::type_id::create( this, axi_agent_0 )
endfunction

endclass :axi_env

—————————————————————————————–
MY NEW_AXI_ENV
—————————————————————————————–

class my_new_env extends uvm_env;

//factory registration
`uvm_component_utils(my_new_env)

//instantiation of axi_env
axi_env axi_env_0;

//instantiation of vitual sequencer

my_virtual_sequencer vir_seqr_0;

//build
virtual function void build();

super.build();

//Disabling the master and slave sequencer
set_config_int(”*.axi_master_sequencer_0″,”count”,0);
set_config_int(”*.axi_slave_sequencer_0″,”count”,0);

//Enabling virtual_sequencer

set_config_string(”* “,”default_sequence”,my_seq);
endfunct ion

//connect
virtual function void connect( )

vir_seq_0.master_seuencencer_0= master_env_0.master_agent_0.master_sequencer_0;
vir_seq_0.slave_sequencencer_0= master_env_0.master_agent_0.master_sequencer_0;

endfunction

virual function connect( );

axi_env_0.axi_agent_0.assign_vif(top.axi_if_0);

endfunction //connect

endclass :my_new_env

———————————————————————————————–

//my_base_test_class
———————————————————————————————–

class my_base_tests extends uvm_test;

//instantiation of my_new_environment_class
my_new_env my_new_env_0;

//factory_registration

`uvm_component_utils( my_base_test);

//construction
function new(string name =” my_base_test” ,ovm_component parent );
super.new(name,parent );
endfunction

//build
virtual function void build ();
set_confing_string(”my_new_env_0.axi_env_0.agent_0″,”axi_base_test” ) :
//problem
endfunction

//connect
virtual function void connect();
axi_agent_0.assign_vif(top.axi_if_0)
endfunction

endclass :axi_base_test

Thank
you sir

Hi sir ,
function new (string name =”name1″
ovm_component parent =null);
super.new(name1,parent);
endfunction

In the above constructor ,sometimes i am writing parent =null and some times only parent ,and then passing in super.new();, blindly i am doing this ,but i am not understanding why i am making parent=null and sometime leaving this as parent . what will be the effect of making so. kindly help me.
regards
Amit