1, this item is composed of dynamic random access storage, static random access storage, synchronous dynamic random access storage, double data rate synchronous dynamic random access storage, graphics processing unit, etc. Dynamic random access memory (DRAM) : This is the most common type of primary storageDevice type, which uses a capacitor to store data. Since capacitors discharge gradually, DRAM needs to refresh periodically to maintain data integrity.
2, the main computer memory is ROM (read-only memory) and RAM (random access memory). The main memory generally adopts semiconductor memory, which has the characteristics of small capacity, fast reading and writing speed and high price compared with auxiliary memory. The main memory in the computer is mainly composed of five parts: memory, control line, address register, data register and address decoding circuit. Since the 1970s, the main memory has been gradually composed of large-scale integrated circuits. In fact, the mainstream high-speed memory is SSRAM (synchronous SRAM) and SDRAM (synchronous DRAM). 1 At present, the maximum capacity of SSRAM that can be easily bought is 8Mb/ piece, and the maximum working speed is 166MHz; The SDRAM that can be easily bought has a maximum capacity of 128Mb/ slice and a maximum operating speed of 133MHz.
SRAM-type memory is mainly used as cache memory. Static random access memory is a type of random access memory. StaticThis means that as long as the memory is powered on, the data stored in it can remain unchanged. In contrast, data stored in dynamic random access memory needs to be updated periodically.
RAM is generally divided into two types: SRAM (static random access memory) and DRAM (dynamic random access memory). SRAM read speed is quite fast, it accesses data cycle of about 1030ns, due to its high cost, mainly used as a Cache memory in the computer (Cache).
Access speed from fast to slow order is: register cache memory hard disk disc tape. Register: Located inside the CPU, it is the fastest memory device in the computer. It is directly involved in the computing process of the computer, and the access speed is very fast, basically matching the running speed of the CPU. However, due to its very limited capacity, it is usually only used for temporary storage of instructions and data.
Cache→ Memory → CD-ROM → Hard disk. The CACHE is the cache of the CPU with the same speed as the CPU. It is used to balance the speed difference between the CPU and memoryThe fastest. The second is RAM. Because the memory is stored in the computer's cache, it needs to be called quickly, and the speed must be fast.
Sorted into cache, random access memory, static random access memory, dynamic random access memory, etc. Cache: Located inside the CPU, it is a high-speed memory used to store the data and instructions recently accessed by the CPU, with the fastest access speed. Random access memory: Also known as main memory, used to store running programs and data, access speed is fast.
Order: Register cache memory Hard disk = optical disk = flash disk = floppy disk main storageRAM ROM Memory hard disk = Optical disk = USB flash drive Floppy disk Hard disk Floppy disk tape. The function of a register is to store binary code, which is composed of triggers with storage function.
SRAM is generally a cache, the speed is second only to the register in semiconductor memory, so it is relatively small, and the cache on the computer is generally in KB; RAM corresponds to what we usually call memory, and now it is basically on G, which is faster than ROM.
Different meaning ROM is short for read-only Memory (Read-Only Memory)A solid-state semiconductor memory that can only read the data stored in advance. RAM is Random Access Memory (also known as main memory), which is the internal memory that exchanges data directly with the CPU.
Read-only Memory and random access memory have the following differences: Meaning different ROM is short for read-only memory (Read Only Memory), is a kind of solid-state semiconductor memory that can only read the data stored in advance. RAM is Random Access Memory, also known as MasterMemory is the internal memory that exchanges data directly with the CPU.
The difference between ROM and RAM: different functions, different characteristics Different functions The main role of ROM is to complete the power-on self-test of the system, the initialization of each function module in the system, the basic input/output driver of the system and the boot operating system. Ram is the internal memory that exchanges data directly with the CPU. The main role of the ROM is to complete the power-on self-test of the system, the initialization of each function module in the system, the driver and boot of the basic input/output of the systemThe operating system. Ram is the internal memory that exchanges data directly with the CPU. It can be read and written at any time and is fast, often serving as a temporary data storage medium for operating systems or other running programs.
【 Answer 】 : A A[resolution]RAM (Ramdomaccess Memory) Volatile random access memory, high-speed access, read and write time is equal, and independent of address, such as computer memory. ROM (ReadOnlyMemory) Read-only memory, information is not lost after power failure, such as the BIOS chip used for computer startup.
1, RAM is random access memory, which is usually said memory. RAM is Random-Access Memory (random access memory) is short for, in the composition of the computer structure, there is a very important part, that is, memory. Because RAM is the most important memory in memory, we usually call it memory directly.
2, RAM is the running memory, referred to as storage, is a mobile phone used to temporarily store data components,The equivalent of a memory bar in a computer. It can be read and written at any time and is very fast, often serving as a temporary data storage medium for operating systems or other running programs. RAM will lose its storage contents when it is powered off, so it is mainly used to store programs that are used for short periods of time.
3, RAM is a random access storage dynamic random access memory storage, it is characterized by volatility, that is, power loss amnesia. ROM usually refers to solidified memory (write once, read repeatedly), which has the opposite characteristics of RAM. ROM is divided into one-time curing, optical erasure and electric erasure rewrite three types.
4, the memory capacity of the computer usually refers to the capacity of random access memory (RAM), which is a key parameter of memory. The capacity of memory is generally 2 times the whole power, such as 64MB, 128MB, 256MB, etc., the larger the memory capacity, the more conducive to the operation of the system. RAM (Random Access Memory) The full name of random access memory, it is equivalent to the mobile storage on the PC, used to store and save data.