Synchronous Dynamic Random Access Memory (SDRAM) is a type of random access memory commonly used in computers and other digital systems. Here is how it works:

Working principle:

SDRAM works synchronously with the system clock, which means that all its operations (such as reading, writing, refreshing, etc.) are performed under the control of the clock signal. The SDRAM is composed of multiple memory arrays, each of which contains many memory cells that can store one bit of binary data. When performing a read operation, the row and column of the memory cell to be read are first selected through the address line, and then the data in the memory cell is transferred to the data bus for external devices to read under the drive of the clock signal. When writing, the address of the memory cell is also selected first, and then the data is written to the specified memory cell through the data bus. Since the memory cell of SDRAM stores data based on capacitors, there will be leakage in the capacitor, so the memory cell needs to be refreshed regularly to maintain the correctness of the data.