What memory can the CPU directly access?

The memory that can be directly accessed in the CPU is the internal memory. It is one of the important components in the computer and is a bridge for communication with the CPU.

Internal memory (Memory) is also called memory. Its function is to temporarily store calculation data in the CPU and exchange data with external memories such as hard disks.

The real place where the computer works is the main memory, that is, the memory. All drivers, operating systems, working data, and finished/semi-finished applications must be loaded into the main memory before they can be read by the CPU; therefore, the performance of the internal memory The impact on computers is very large.

Composition of internal memory

Memory generally uses semiconductor storage units, including random access memory (RAM), read-only memory (ROM), and cache memory (CACHE).

RAM: It is a kind of memory that can read/write data randomly, also called read/write memory. RAM has the following two characteristics: First, it can be read and written. The original stored content is not damaged when reading, and the original stored content is modified only when writing. Second, RAM can only be used to temporarily store information. Once the power is cut off, the stored content disappears immediately, which means it is volatile.

ROM: It is a read-only memory. As the name suggests, its characteristic is that it can only read the original content and cannot write new content by the user. The original stored content is written once by the manufacturer using mask technology and saved permanently. It is generally used to store dedicated fixed programs and data.

CACHE: Its original meaning refers to a kind of RAM whose access speed is faster than that of general random access memory (RAM). Generally speaking, it does not use DRAM technology like the system's main memory, but uses Expensive but faster SRAM technology, also known as cache memory.

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