UVM callback

UVM callback example

Callback in uvm_driver

step1

实现空的callback class

class driver_cb extends uvm_callback;extern virtual task ;
endclass

step 2

实现functional class

class my_driver extends uvm_driver;typedef driver_cb cb_type;typedef m_driver this_type;`uvm_component_utils(my_driver)`uvm_register_cb(this_type, cb_type)// in functional task//`uvm_do_callback(this_type, cb_type, cb_task(this, m_item));task run_phase(uvm_phase phase);`uvm_do_callback(this_type, cb_type, cb_task(this, m_item));drive_pkt();//`uvm_do_callbacks(driver,driver_callback,post_drive());endtask
endclass

step3

实现具体 callback class 并且注入

class driver_cb_rready extends driver_cb;// concept
endclassclass m_case/m_env extends uvm_test/uvm_env;typedef uvm_callbacks#(m_driver, driver_cb) driver_cb_pool;// build_phasedriver_cb_rready drv_cb_rrdy;drv_cb_rrdy = driver_cb_rready::type_id::create("drv_cb_rrdy");// connect_phasedriver_cb_pool::add(m_env.m_agt.m_drv, drv_cb_rrdy);
endclass

Callback in uvm_sequence

step1 实现空的callback class

class mem_callback extends uvm_callback;`uvm_object_utils(mem_callback)function new(string name = "mem_callback");super.new(name);endfunctionvirtual task update_pkt(ref mem_seq_item pkt); endtask
endclass

step2 register the callback class to sequencer

class mem_sequencer extends uvm_sequencer#(mem_seq_item);`uvm_component_utils(mem_sequencer)`uvm_register_cb(mem_sequencer,mem_callback)//---------------------------------------//constructor//---------------------------------------function new(string name, uvm_component parent);super.new(name,parent);endfunctionendclass

 step3 place the callback hook on the sequence

class mem_sequence extends uvm_sequence#(mem_seq_item);`uvm_object_utils(mem_sequence)//---------------------------------------//Constructor//---------------------------------------function new(string name = "mem_sequence");super.new(name);endfunction`uvm_declare_p_sequencer(mem_sequencer)//---------------------------------------// create, randomize and send the item to driver//---------------------------------------virtual task body();req = mem_seq_item::type_id::create("req");wait_for_grant();req.randomize();`uvm_do_obj_callbacks(mem_sequencer,mem_callback,p_sequencer,update_pkt(req));send_request(req);wait_for_item_done();endtask
endclass

step4 实现具体 callback class 并且注入

class user_callback extends mem_callback;`uvm_object_utils(user_callback)function new(string name = "user_callback");super.new(name);endfunctiontask update_pkt(ref mem_seq_item pkt);`uvm_info("USER_CALLBACK","[update_pkt] before packet modification",UVM_LOW);pkt.print();pkt.addr = ~pkt.addr;`uvm_info("USER_CALLBACK","[update_pkt] after packet modification",UVM_LOW);pkt.print();endtask
endclassclass user_callback_test extends mem_test;user_callback callback_1;`uvm_component_utils(user_callback_test)function new(string name = "user_callback_test", uvm_component parent=null);super.new(name,parent);endfunctionfunction void build_phase(uvm_phase phase);super.build_phase(phase);callback_1 = user_callback::type_id::create("callback_1", this);endfunctionfunction void end_of_elaboration();uvm_callbacks#(mem_sequencer,mem_callback)::add(env.mem_agnt.sequencer,callback_1);endfunction : end_of_elaboration
endclass

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