Source : Free On-Line Dictionary of Computing

Data Address Generator
     
         (DAG) The mechanism which generates temporary
        memory addresses for data that is transferred between memory
        and {registers} in a {Digital Signal Processor}.
     
        Certain {DSP} architectures incorporate more than one DAG to
        simplify the programming needed to move blocks of data between
        buffers.
     
        For instance, certain {Fast Fourier Transform} {algorithms}
        requiring {bit reversing}, can use the DAG for that purpose,
        or they can use two DAGS, one for Program Memory Data (PMD),
        and the other for Data Memory Data (DMD).
     
        (1997-08-12)