Synchronous Dynamic Random Access Memory SDRAM Synchronous DRAM <storage> (SDRAM, Synchronous DRAM) A form of {DRAM} which adds a separate {clock} signal to the control signals. SDRAM chips can contain more complex {state machines}, allowing them to support "burst" access modes that clock out a series of successive {bits} (similar to the {nibble mode DRAM}). (2007-05-08)