What Does Synchronous DRAM (SDRAM) Mean?
Synchronous dynamic random access memory (SDRAM) is dynamic random access memory (DRAM) with an interface synchronous with the system bus carrying data between the CPU and the memory controller hub. SDRAM has a rapidly responding synchronous interface, which is in sync with the system bus. SDRAM waits for the clock signal before it responds to control inputs.
Techopedia Explains Synchronous DRAM (SDRAM)
With older clocked electronic circuits, the transfer rate was one per full cycle of the clock signal. This cycle is called rise and fall. A clock signal changes two times per transfer, but the data lines change no more than one time per transfer. This restriction can cause integrity (data corruption and errors during transmission) when high bandwidths are used. SDRAM transmits signals once per clock cycle. The newer DDR transmits twice per clock cycle.
