[Gems-users] a confusing action in MOESI_CMP_directory

["shanshuchang" <shanshuchang@xxxxxxxxx>]

Hi all,

I am studing MOESI_CMP_directory and I am really confused about the action e_sendData:

 

  action(e_sendData, "e", desc="Send data from cache to requestor") {
    peek(requestNetwork_in, RequestMsg) {
      if (in_msg.RequestorMachine == MachineType:L2Cache) {
        enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
           ***;
        }
           ***;
      }
      else {
        enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
          ***;

          out_msg.Destination.add(in_msg.Requestor);
          ***;
          out_msg.MessageSize := MessageSizeType:ResponseLocal_Data;
        }
        DEBUG_EXPR("Sending data to L1");
      }
    }
  }

 

It seems that the action's "else{***;}" codes are used to send data to other processors who request L1_GETS.

But here it uses MessageBuffer requestNetwork_out which are connected with L2 cache's corresponding MessageBuffer.

 

Meanwhile, L1 cache with block state IS can just get data message from another MessageBuffer of L1--responseToL1Cache_in,

So I am confused about how the data message from L1 owner is transferred to the L1 with IS state.

 

Thanks.