memorizer is an electronic device that uses semiconductors, memorizer media and other technologies to store data. Memory unit is actually a kind of sequential logic integrated circuit. They can be divided into read-only memory (ROM) and random access memory (RAM) according to the type of memory used. They have different functions and therefore different descriptions.

Memory is a memory device in a computer system that stores programs and data. Semiconductor devices and magnetic materials are the main storage media for memory. The smallest unit of storage in a memory is a bistable semiconductor circuit or a CMOS transistor or magnetic material that stores a binary code. A storage unit consists of several storage units, and then a storage unit consists of many storage units. Depending on the performance and usage of storage materials, there are several different classification methods for storage.

Memories are collections of many storage units, arranged in unit number order. Each cell consists of several binary bits to represent the values stored in the storage unit. This structure is very similar to the structure of arrays, so in VHDL language, the storage is usually described by arrays.

Main memory works by storing or reading all kinds of information according to the address of the storage unit, collectively referred to as access memory. The carrier that collects the storage unit in the main memory is called the storage unit. Each unit in the storage can store a sequence of binary codes representing information whose total number of bits is called the word length of a storage unit. The address of the storage unit corresponds to the information stored in it. There is only one cell address, which is fixed and unchanged, and the information stored in it can be replaced.

The binary code indicating each cell is called an address code. When looking for a cell, give its address code first. The register that temporarily stores this address number is called a memory address register (MAR). A memory data register (MDR) is also set up to store information that is taken out of the main memory storage unit or that is ready to be stored in a storage unit.