In embedded systems, DDR refers to the "Double Data Rate" (Double Data Rate) SDRAM memory type, which is a high-speed, large-capacity memory device. Compared with traditional SDRAM, DDR can transfer two data in one clock cycle, so it can provide higher bandwidth.
DDR SDRAM has the following characteristics:
- High speed: Since DDR transmits two data in one clock cycle, compared with ordinary SDRAM, DDR can provide a higher data transmission rate, thereby improving the efficiency of the system.
- Large capacity: DDR SDRAM can also achieve a large storage capacity, and each memory chip can have a capacity of several hundred MB or several GB.
- Low power consumption: During the transmission process, DDR SDRAM only needs to use power when sending and reading data, and is in standby state for the rest of the time, so the power consumption is much lower than that of traditional SDRAM.
- Reliability: DDR SDRAM uses ECC (Error Correcting Code) technology to detect and correct errors in memory.
Because DDR SDRAM has the above advantages, it is widely used in various embedded systems, such as smart phones, computers, digital TVs, game consoles, etc., to meet the needs of high speed, large capacity, and low power consumption.