// LEGACY INT REQUEST
   assign app_int_sts = app_int_req;

   always @ (negedge rstn or posedge clk_in) begin
      if (rstn==1'b0) begin
          app_int_req      <= 1'b0;
          app_int_ack_reg  <= 1'b0;
          int_deassert     <= 1'b0;
      end
      else begin
          app_int_ack_reg <= app_int_ack;                                     // input boundary reg
          int_deassert    <= app_int_ack_reg ? ~int_deassert : int_deassert;  // track whether core is sending interrupt ASSERTION message or DEASSERTION message.

          if (app_int_ack_reg)                                                // deassert request when Interrupt ASSERTION is ack-ed
              app_int_req  <= 1'b0;
          else if ((~msi_enable & ~int_deassert) &
                    (((msi_sel_dmawr == 1'b1) &  (app_msi_req_dmawr == 1'b1)) |
                    ((msi_sel_dmawr == 1'b0) &  (app_msi_req_dmard == 1'b1)) ) ) begin  // assert if there is a request, and not waiting for the DEASSERTION ack for this request
                  app_int_req  <= 1'b1;
          end
          else
              app_int_req  <= app_int_req;
      end
   end


   // MSI & LEGACY ACKNOWLEDGE - sent to the internal interrupt requestor

   assign interrupt_ack_int = (app_msi_ack &  msi_enable) |                     // Ack from MSI
                              (app_int_ack_reg & ~int_deassert & ~msi_enable);   // INT ASSERT Message Ack from Legacy