What memory can the CPU directly access?

The memory that the CPU can directly access is "internal memory". All external memories, such as hard disks, floppy disks, optical disks, etc. cannot be directly accessed by the CPU; the central processing unit CPU can only directly access the data stored in the memory. Data, while data in external memory can only be accessed and processed by the central processor after being transferred into the memory.

#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

What memory can the CPU directly access?

The memory that the CPU can directly access is internal memory.

What the CPU can directly access is the internal memory. All external memories such as hard disks, floppy disks, optical disks, etc. cannot be directly accessed by the CPU.

Internal memory introduction:

The internal memory is directly connected to the CPU. It has a small storage capacity but is fast. It is used to store the instructions and instructions of the currently running program. data and exchange information directly with the CPU. The internal memory is composed of many storage units, each unit can store a binary number or an instruction represented by a binary code. Internal memory is composed of random access memory and read-only memory.

The central processing unit (CPU) can only directly access the data stored in the memory, while the data in the external memory can only be accessed and processed by the central processing unit after being transferred into the memory.

When the content in the internal memory is to be read and written, the memory address from the address bus is decoded by the address decoder, and the designated storage unit is selected, and the read and write control circuit is based on the read and write Commands implement access operations to the memory, and the data bus is used to transmit information written to or read from the internal memory.

CPU introduction:

The central processing unit (central processing unit, referred to as CPU) is the computing and control core of the computer system. It is responsible for information processing and program execution. the final execution unit. Since its creation, CPU has made great progress in logical structure, operating efficiency and function extension.

Central processing unit (CPU) is one of the main devices of electronic computers and the core component of computers. Its function is mainly to interpret computer instructions and process data in computer software. The CPU is the core component of the computer that reads instructions, decodes them, and executes them. The central processing unit mainly consists of two parts, namely the controller and the arithmetic unit, which also include cache memory and the data and control bus that realize the connection between them. The three core components of an electronic computer are the CPU, internal memory, and input/output devices. The main functions of the central processing unit are to process instructions, perform operations, control time, and process data.

In computer architecture, the CPU is the core hardware unit that controls and allocates all hardware resources of the computer (such as memory, input and output units) and performs general operations. The CPU is the computing and control core of the computer. The operations of all software layers in the computer system will eventually be mapped to CPU operations through the instruction set.

For more related knowledge, please visit the FAQ column!

The above is the detailed content of What memory can the CPU directly access?. For more information, please follow other related articles on the PHP Chinese website!