Briefly describe the classification of computer memory and its characteristics?

RAM random access device, do the main memory, ROM read-only memory, now generally not used, EPROM, rewritable memory, generally erased with ultraviolet light, can be written electrically, used less. E2PROM, electrical erase, electrical write, is now widely used, such as the BIOS of a computer, etc.

1.Memory is divided into virtual memory and physical memory.

2.Virtual memory is a cache used for web pages or software.

3.Physical memory is used to store electronic data that can be viewed and used.

Summary. Internal memory, also known as memory, is used to store "programs" and "data". **When the processor executes the program, it accesses the program and data from memory.

Memory can be divided into two parts: ROM (read-only memory) and RAM (random memory). The contents stored in the ROM are designed in advance by the computer designer and manufacturer, and the user can only use them, and cannot modify, delete or add them, and it will not be lost due to power failure.

RAM is usually used to store the user's programs and data, and what people generally call computer memory is for RAM.

2. What are the types of internal memory in a computer? What are the characteristics of each of them?

Internal memory, also known as memory, is used to store "programs" and "data". **When the processor executes a program, it accesses the program and data from memory. Memory can be divided into two parts:

ROM (read-only memory) and RAM (random reed) memory. The contents of the ROM are designed in advance by the computer designer and manufacturer, and the user can only use them, and cannot modify, delete and add, and it will not be lost due to power failure. RAM is usually used to store the user's programs and data, and what people generally call computer memory is for RAM.

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There are two main types of computer memory:

1. RAM (random

access

memory), which can be read or written.

2. Read-only memory ROM (read

onlymemory), as the name suggests, can only be read and not written.

1.Random Access to Memory (random

access

memory）

RAM has the following characteristics: it can be read and written. The original stored content is not damaged when it is read, and the original stored content is modified only when it is written. When the power is off, the stored content disappears immediately, i.e., it is volatile.

RAM can be divided into dynamic (

dynamic

ram) and static (static

RAM). DRAM is characterized by high integration and is mainly used for large-capacity internal memory; SRAM is characterized by high access speed and is mainly used in high-speed buffer memory.

2 Read-only memory (read

onlymemory)

ROMs are read-only memory. As the name suggests, it is characterized by the fact that only the original content can be read out, and no new content can be written by the user. The original stored content is written by the manufacturer in one go using mask technology and is permanently preserved. It's average.

It is used to store dedicated fixed programs and data. It will not be lost due to power failure.

Memory is where programs and data are stored temporarily, such as when you type characters on the keyboard when we are using WPS to process a document, and the data compared to DDR2 technology.

It's stored in memory, and when you choose to save it, the data in the memory will be stored on a hard (magnetic) disk. Before we can understand it further, we should also recognize its physical concepts. Memory generally uses semiconductor memory cells, including random access memory (RAM), read-only memory (ROM), and cache.

Simply because RAM is the most important memory of them all. (Synchronous) SDRAM Synchronous Dynamic Random Access Memory Bench Backup: SDRAM is 168 feet of RAM, which is currently used by Pentium and above models.

SDRAM locks the CPU and RAM together through the same clock, so that the CPU and RAM can share a clock cycle, work synchronously at the same speed, and the rising edge of each clock pulse starts to transmit data, which is 50% faster than EDO memory. DDR (DoubleDataRate) RAM: An update to SDRAM that allows data to be transmitted on the rising and falling edges of the clock pulse, so that the speed of SDRAM can be doubled without increasing the frequency of the clock.

Read-only memory (ROM)ROM stands for read-only memory, and when a ROM is made, information (data or programs) is stored and stored permanently. This information can only be read out, generally not written, and this data will not be lost even if the machine has a power outage. ROMs are generally used to store the basic programs and data of a computer, such as BIOSROM.

Its physical form factor is generally a double in-line (DIP) manifold.

1、sdram

Synchronous Dynamic RAM) uses the operating voltage, and the memory data bit width is 64 bits. SDRAM and CPU are locked together by a single clock frequency, making both work synchronously at the same speed. SDRAM transmits data on the rising edge of each clock pulse SDRAM memory with a finger of 168 pins.

2、ddr sdram

Double Data Rate SDRAM) uses an operating voltage with a memory data bit width of 64 bits. DDR SDRAM (DDR memory) transmits data twice on one clock pulse, one time on the rising and falling edges of the clock pulse, so it is called double-rate SDRAM.

3、ddr2 sdram

Double Data Rate 2 (SDRAM) uses an operating voltage with 64 bits of memory data bit width. DDR2 memory, like DDR memory, transmits data twice with one clock pulse, but DDR2 memory has twice the pre-read capability of the previous generation DDR memory, that is, 4-bit data pre-read.

4、ddr3 sdram

Double Data Rate 3 SDRAM) uses a V operating voltage with a memory data bit width of 64 bits. Similarly, DDR3 memory has twice the read-ahead capability of the previous generation DDR2 memory, i.e., 8-bit data read-through.

5、ddr4 sdram

Double Data Rate 4 SDRAM) uses an operating voltage with 64-bit memory data bit width and 16-bit data read. The dual-channel mechanism is eliminated, and one memory is one channel. The operating frequency can reach up to 4266 MHz and the data transfer bandwidth of a single DDR4 memory is up to 34 Gb/s.