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Competitive landscape of the memory chip industry

2021-06-28

Subdivided product competition pattern: DRAM and NANDFlash are the main products. From the perspective of memory chip segmentation products, DRAM and NANDFlash currently occupy more than 95% of the market share of memory chips. According to the data released by ICInsights, DRAM sales will account for about 53% of the entire storage market in 2020, and the proportion of flash memory will reach about 45%, of which NAND flash memory is 44%, NOR flash memory is 1%, and other memory chips (EEPROM, EPROM) , ROM, SRAM, etc.) will grow slowly, but it is likely to grab the market share

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Memory chip: the most important segment of the semiconductor market

2021-06-28

Memory chips are an indispensable key element in emerging fields such as the Internet of Things, big data, and cloud computing in the future. Therefore, the autonomous controllability of memory chips is of great strategic significance to the advancement of my country's new round of informatization. The implementation of the "National Integrated Circuit Industry Development Promotion Outline", "Manufacturing 2025" and other series of policies and the large fund-led capital investment have laid a good foundation for the accelerated development of the domestic memory industry. 　　According to WSTS statistics, my country's semiconductor market is showing a rapid growth trend, and the growth rate of the semiconductor market is higher than that of the global market: the global semiconductor market in 2019 is 4.0

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What is the working principle of the memory?

2021-06-26

The memory is a memory component used to store programs and various data information. Memory can be divided into two categories: main memory (main memory or memory for short) and auxiliary memory (auxiliary memory or external memory for short). It is the main memory that directly exchanges information with the CPU. The working mode of the main memory is to store or read various types of information according to the address of the storage unit, collectively referred to as accessing the memory. The carrier that collects storage units in the main memory is called a memory bank. Each unit in the memory bank can store a string of information represented by a binary code. The total number of bits of this information is called the word length of a memory unit. There is a one-to-one correspondence between the address of the storage unit and the information stored in it, and the unit address is only

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What are the main advantages of memory?

2021-06-28

The main advantages of this kind of memory are: ① The memory cell array and the main peripheral logic circuit are made on the same silicon chip, and the output and input levels can be compatible and matched with the off-chip circuits. This can greatly simplify the interface between the computer's operation and control and storage; 　　②The speed of data storage and reading is about three orders of magnitude faster than that of magnetic memory, which can greatly increase the computer's computing speed; 　　③Use large capacity The semiconductor memory greatly reduces and reduces the volume and cost of the storage body. Therefore, in terms of computer high-speed storage, semiconductor memory has completely replaced the past magnetic memory. Used as

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Basic structure of semiconductor memory chip

2021-06-26

The semiconductor memory chip is composed of a decoding drive circuit, a memory matrix, a reading and writing circuit, an address line, a data line, a control line, and a chip selection line. Among them, the decoding drive circuit, the storage matrix, and the read-write circuit belong to the core structure.

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What is the function of the memory chip selection line

2021-06-26

Suppose the CPU now requires a 16K×1 bit memory chip to form a 64K×8 bit memory. How to use a 16K×1 bit memory chip to form a 64K×8 bit memory?

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The future trend of memory

2021-06-26

Memory is the main medium for storing data in a computer. With the development in recent years, the changes of the memory are changing with each passing day, and various new types of memory have entered the market, and the popularization of maintenance methods for the new type of memory has become imminent.

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Do you know the purpose of storage management?

2021-06-26

The purpose of storage management is to provide users with convenient, safe and sufficiently large storage space. Convenience refers to the separation of logical addresses and physical addresses. Users only write programs in their respective logical address spaces, and do not have to worry about the details of physical space and physical addresses. The address conversion is automatically completed by the operating system; security refers to those that reside in memory at the same time. Multiple user processes will not interfere with each other, nor will they access the space occupied by the operating system; a sufficiently large storage space refers to the use of virtual storage technology to logically expand the memory space, so that users can compare Run larger programs in a small memory.

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The hierarchy of the storage system

2021-06-26

In order to improve the performance of the memory, the memory of various storage capacities, access speeds and prices are usually organized into a multi-layer memory according to a hierarchical structure, and the management software and auxiliary hardware are organically combined into a unified whole to make the stored programs and data Distributed in each memory according to levels.　　 mainly uses a three-level hierarchical structure to form a storage system, which is composed of a high-speed cache memory, a main memory and an auxiliary memory. In the figure, the capacity gradually increases from top to bottom, the speed is gradually reduced, and the cost is gradually reduced.　　 The whole structure can be seen as two levels: main storage-secondary storage and Cache-main storage. Under the management of auxiliary hardware and computer operating system, the main storage and auxiliary storage can be regarded as a storage unit, and the addressable storage space formed is much larger than the main storage space. Due to the large auxiliary storage capacity and low price, the overall average price of the storage system is reduced. Cache-main memory level can narrow the speed gap between main memory and CPU, and improve the access speed of the memory system as a whole.　　 A larger storage system is composed of various types of storage devices, forming a storage system with a multi-level hierarchical structure. This system not only has a speed similar to that of a CPU, but also has a great capacity, and the price is relatively low. It can be seen that a memory system with a multi-level hierarchical structure can effectively solve the contradiction between the speed, capacity and price of the memory.