Source : Free On-Line Dictionary of Computing

Single Data Rate Random Access Memory
     
         (SDR-RAM, SDR-SDRAM, Single Data Rate Synchronous
        Dynamic Random Access Memory) {RAM} or {SDRAM} that transfers
        data on only one {clock} transition (0-1 or 1-0), in contrast
        to {DDR-RAM}.
     
        (2001-05-24)