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how to connect a single initiator socket to a multiple target socket

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Use a multi_pass_thru_socket and a simple loop (incomplete - extend as needed):

#include <systemc>
#include <tlm>
#include <tlm_utils/simple_initiator_socket.h>
#include <tlm_utils/multi_passthrough_initiator_socket.h>
struct Broadcast : sc_core::sc_module
  tlm_utils::simple_target_socket target_socket<>;
  tlm_utils::multi_pass_through_initiator_socket initiator_socket<Broadcast>;
    : target_socket("target_socket")
    , initiator_socket("initiator_socket")
    target_socket.register_b_transport( this, &Broadcast::b_transport );
  void b_transport(tlm::tlm_generic_payload& payload, sc_time& delay);

void Broadcast::b_transport(tlm::tlm_generic_payload& payload, sc_time& delay)
      for (size_t i=0; i<initiator_socket.size(); ++i) {
		initiator_socket[i]->b_transport(payload, delay);


Of course you need to be careful with this because technically you probably need to copy the payload (i.e. create an individual transaction per target). If it is a an IGNORE_COMMAND and you use appropriately designed extensions, then it might work.

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