Using uvm_config_db to nitialize/pass params from the sequence to the transaction?

UVM
1

I have the following transaction:

typedef enum {READ = 0, WRITE = 1} direction_enum;


//Transaction

class axi_transaction extends uvm_sequence_item();
   bit id = 0;  //const
   bit [31:0] addr;
   bit [2:0]  size = 0'b100;//const
   direction_enum rw;
   bit [31:0] transfers [$];



   //factory registration
   `uvm_object_utils_begin(axi_transaction)
   `uvm_field_int(id, UVM_ALL_ON)
   `uvm_field_int(addr, UVM_ALL_ON)
   `uvm_field_int(size, UVM_ALL_ON)
   `uvm_field_enum(rw, UVM_ALL_ON)
   `uvm_field_int(transfers, UVM_ALL_ON)      
   `uvm_object_utils_end  

   //constructor
   function new(string name = "axi_transaction");
      super.new(name);
   endfunction: new

endclass: axi_transaction

I understood that I have to use uvm_config_db, so I can initializes the transaction in the sequence with arguments which initialize some of the transaction members (like addr, transfers) by, but I’m not sure how to do it.

2

In reply to saritr:

You don’t want to use the config_db to initialize arguments. This is because the config_db isn’t designed to handle dynamic data efficiently.

You want to set the data elements to the appropriate values when the sequence item is created/randomized:


axi_transaction m_txn;

m_txn = axi_transaction::type_id::create("m_txn");
m_txn.addr = xxxxx;
m_txn.size = xxxxx;
...