Semiconductor memory is one of the main product categories of integrated circuits. It holds about 30% of the global IC market share, and its development drives the development of the entire IC industry. Memory, as an important memory component in various electronic computers, data and image processing systems, digital control systems, and intelligent electronic instruments, has been widely used and rapidly developed. Semiconductor integrated circuit memories can be divided into two major categories in terms of functionality: one is Read Only Memory (ROM)- The class is Random Access Memory (RAM), abbreviated as Random Access Memory. From a usage perspective, semiconductor memory can also be divided into two categories: volatile memory that loses data after a power outage and non volatile memory that does not lose data after a power outage. Among them, volatile memory is further divided into two types: dynamic random access memory (DRAM) and static random access memory (SRAM). Non volatile memory is divided into mask ROM, EPROM, EEPROM, and flash memory. Other types include radiation resistant memory SRAM, synchronous dynamic random access memory SDRAM, FIFO memory, and new types of memory such as ferroelectric memory (FRAM)
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