What Does Double Data Rate Synchronous Dynamic Random-Access Memory (DDR SDRAM) Mean?
Double data rate synchronous dynamic random access memory (DDR SDRAM) is a type of random-access memory module that allows for higher transfer rates and faster performance compared to earlier RAM modules. DDR SDRAM transfers memory on both the rising edge and falling edge of a clock cycle, doubling the transfer rate. This is where the name “double data rate” comes from.
Techopedia Explains Double Data Rate Synchronous Dynamic Random-Access Memory (DDR SDRAM)
DDR SDRAM works on the principle of transferring data on both the rising edge of a clock cycle and the falling edge. While most people might perceive a computer’s clock cycle as a discrete event in time, electronically it is a wave, typically a square wave. This wave has a rising edge and a falling edge. Typical RAM only transmits data on the rising edge, but SDRAM transfers data on the falling edge, which allows it to transfer more data in a clock cycle, doubling the performance of a chip. This is called “double pumping.” DDR can transfer data at a rate of up to 1600 MB/s.
