Double data rate
（重定向自Double pumped）
![A comparison between single data rate, double data rate, and quad data rate](/Images/godic/202501/09/SDR_DDR_QDR.svg2042.png")
In computing, a computer bus operating with double data rate (DDR) transfers data on both the rising and falling edges of the clock signal. This is also known as double pumped, dual-pumped, and double transition. The term toggle mode is used in the context of NAND flash memory.