If Else uvm_config_db get

UVM
, ,
1

I wanted to make a component more reusable. I wanted to select various types of memories based on the class parameters. This is what I have now:

class qvip_memory_agent_ext #(string MEM_T = "mgc_ddr", type CONFIG_T, type TRANS_T) extends uvm_component;

I wanted to select which mem type in the build phase by the following:

function void build_phase(uvm_phase phase);
  super.build_phase(phase);
  monitored_transaction   = TRANS_T ::type_id::create("monitored_transaction");
  monitored_transaction.m_receive_id = get_stream_id (this);
  vip_config_h = CONFIG_T::type_id::create("vip_config_h");
  if (MEM_T == "mgc_pnor") begin
    if( !uvm_config_db #( virtual mgc_pnor )::get( null , "UVMF_VIRTUAL_INTERFACES" , if_name , vip_config_h.m_bfm ) ) begin
      $stacktrace;
      `uvm_fatal("CFG" , $sformatf("uvm_config_db #( virtual mvc_pnor )::get cannot find interface bfm resource with interface_name %s",if_name ))
    end
  end else begin
    if( !uvm_config_db #( virtual mgc_ddr )::get( null , "UVMF_VIRTUAL_INTERFACES" , if_name , vip_config_h.m_bfm ) ) begin
      $stacktrace;
      `uvm_fatal("CFG" , $sformatf("uvm_config_db #( virtual mvc_ddr )::get cannot find interface bfm resource with interface_name %s",if_name ))
    end
  end
endfunction

My environment makes a typedef of the component:

 typedef qvip_memory_agent_ext #(.MEM_T("mgc_pnor"),.TRANS_T(pnor_host_write),.CONFIG_T(pnor_vip_config)) my_flash_t;
   my_flash_t my_flash;

This compiles but the sim load complains:

** Error: (vsim-13216) Illegal assignment to type ‘virtual mgc_ddr’ from type ‘virtual mgc_pnor’:

…

The line number given in the sim load error refers to the uvm_config_db get in the else statement. I didn’t think the ‘else’ would get hit during the load. Can anyone advise a better way of doing this? thx

2

In reply to Greg Happel:

The both branches of the if need to be executable.

A better way of doing this would be putting the config_db::get inside the construction of CONFIG_T. It’s already parameterized with the virtual interface type.