FIFOed - Serial UART

I am interested in using the NIOS Serial UART in my design. I also need to store the serial data in a FIFO for both Rx and Tx data. I have seen that there is a customized version of this UART "FIFOed Avalon Uart". On recieve I would like to store a Time Tag value within the FIFO for the serial data received. Is this possible ? If so how would I go about doing it ?

I am in the process of designing a multi-processor system. I assume that I could instatiate another NIOS to read fromt the Serial Data from the UART along with a the associated Time Tag and store both in a FIFO external to the UART, however I was wondering if there is a simple way to access the FIFO within the FIFOed custom component to prevent me from having to use this additional Nios !?