What is i/o interface

The i/o interface is a basic input and output port, which is prepared for each device action. Each device will have a dedicated [I/O] address to process its own input and output information; The connection and data exchange between the CPU and external devices and memory need to be realized through interface devices. The former is called the [I/O] interface, while the latter is called the memory interface.

#The operating environment of this article: Windows 7 system, Dell G3 computer.

i/o interfaceSimply put, it is the basic input and output port, which is prepared for each device action.

I/O is the abbreviation of input/output , that is, the input and output ports. Each device will have a dedicated I/O address to handle its own input and output information. The connection and data exchange between the CPU and external devices and memory need to be realized through interface devices. The former is called the I/O interface, while the latter is called the memory interface. Memory usually works under the synchronous control of the CPU, and the interface circuit is relatively simple; there are many types of I/O devices, and their corresponding interface circuits are also different. Therefore, it is customary to refer to the interface only as the I/O interface.

The concept of I/0 interface

1. Classification of interfaces

The function of the I/O interface is to realize that the CPU connects I/O circuits and peripheral devices through the system bus Linked together, according to the complexity of circuits and devices, I/O interface hardware is mainly divided into two categories:

(1) I/O interface chip

Most of these chips are integrated Circuits input different commands and parameters through the CPU, and control related I/O circuits and simple peripherals to perform corresponding operations. Common interface chips such as timers/counters, interrupt controllers, DMA controllers, parallel interfaces, etc.

(2) I/O interface control card

There are several integrated circuits that are composed into one component according to certain logic, either directly on the motherboard with the CPU, or a plug-in plugged in on the system bus slot.

According to the connection object of the interface, they can be divided into serial interface, parallel interface, keyboard interface and disk interface, etc.

2. Function of the interface

Due to the wide variety of computer peripherals, almost all of which use electromechanical transmission equipment, the CPU has the following problems when exchanging data with I/O devices:

Speed ​​mismatch: I/O devices work much slower than the CPU, and due to different types, the speed difference between them is also very large. For example, the transmission speed of the hard disk is faster than that of the printer. a lot of.

If you want to learn more about programming, please pay attention to the php training column!

The above is the detailed content of What is i/o interface. For more information, please follow other related articles on the PHP Chinese website!