By PURPLELEC | 02 November 2023 | 0 Comments
What are the categories of embedded storage?
Embedded storage is a memory device in a computer system used to store programs and data.
The storage media that constitute embedded storage currently mainly uses semiconductor devices and magnetic materials. The smallest storage unit in memory is a bistable semiconductor circuit or a CMOS transistor or a storage element of magnetic material, which can store a binary code. A storage unit is composed of several storage units, and a memory is composed of many storage units.
Based on the performance and usage of storage materials, there are various classification methods for embedded storage:
★ According to storage media
Semiconductor memory: memory composed of semiconductor devices.
Magnetic surface memory: A memory made of magnetic materials.
★ According to storage method
Random access memory: The contents of any storage unit can be accessed randomly, and the access time has nothing to do with the physical location of the storage unit.
Sequential memory: It can only be accessed in a certain order, and the access time is related to the physical location of the storage unit.
★ Divided according to the reading and writing functions of the memory
Read-only memory (ROM): a semiconductor memory whose stored content is fixed and can only be read but not written.
Random read-write memory (RAM): Semiconductor memory that can be both read and written.
★ According to the storability of information
Non-permanent memory: memory that loses information when the power is turned off.
Permanent memory: memory that can still retain information after power is turned off.
★ Divided according to its role in computer system
According to the role of embedded storage in computer systems, it can be divided into main memory, auxiliary memory, cache memory, control memory, etc.
In order to solve the contradiction between the memory requirements of large capacity, fast speed and low cost, multi-level memory architecture is usually adopted, that is, using cache memory, main memory and external memory.
Cache memory
High-speed access to instructions and data. Fast access speed, but small storage capacity
main memory
Stores a large number of programs and data during computer operation. The access speed is fast and the storage capacity is not large.
External memory
It stores system programs and large data files and databases with large storage capacity and low bit cost. It is used to store all information in the computer: including programs, original data, intermediate results of operations, and final results.
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