[Interview Question] You have multiple analysis ports in your environment, and you need to broadcast a packet to all ports. How can you implement this in UVM? Write the relevant code snippet

UVM
1

Hi all, I was asked this question in the interview and the solution i wrote was -

class broadcast #(pkt) extends uvm_component;
  `uvm_component_utils(broadcast)
  
  uvm_analysis_imp #(pkt, broadcast) port_in;
  uvm_analysis_port #(pkt) port_out;
  
  function new(string name = "broadcast", uvm_component parent = null);
    super.new(name, parent);
  endfunction
  
  virtual function void write(pkt p);
    port_out.write(p);
  endfunction  
endclass
  
class env extends uvm_env;
  `uvm_component_utils(env)
  
  uvm_analysis_port #(pkt) analysis_port1;
  uvm_analysis_port #(pkt) analysis_port2;
  broadcast #(pkt) bcast;
  
  function new(string name = "env", uvm_component parent = "null");
    super.new(name, parent);
  endfunction
  
  function void build_phase(uvm_phase phase);
    super.build_phase(phase);
    bcast = broadcast#(pkt)::type_id::create("bcast",this);
    analysis_port1 = new("analysis_port1", this);
    analysis_port2 = new("analysis_port2", this);
    
    bcast.outp.connect(analysis_port1);
    bcast.outp.connect(analysis_port2);
  endfunction
  
  function void connect_phase(uvm_phase phase);
    super.connect_phase(phase);
    producer.analysis_port.connect(bcast.inp);
  endfunction
endclass

Is this solution correct? Can you suggest any improvement?

2

This is a very vague question. Does “multiple ports in your environment“ mean the environment component, or the entire hierarchy of the environment including sub-components? Normally analysis ports are sent from monitors when sending multiple transactions. And when it asks “broadcast a packet to all ports”, does that mean the same packet to all ports?

3

Hi Dave!

  1. The ports are meant to be in environment component.
  2. Yes, Same packet is needed to be send to all ports in that env component