What are the control methods of information transmission between hosts and peripherals in the Internet?
This article mainly introduces what are the control methods of information transmission between hosts and peripherals in the Internet. What is introduced in this article is very detailed and has a certain reference value. Interested friends must finish reading it!
The control modes of information transmission between host and peripheral devices are: 1, unconditional transmission, suitable for peripherals which are always ready; 2, query mode transmission; 3, interrupt mode transmission; 4, direct memory access.
The operating environment of this tutorial: windows7 system, Dell G3 computer.
There are four ways to control the data transfer between the host and the peripheral:
Unconditional transmission
Inquiry transmission
Interrupted mode transmission
Direct Memory Access (DMA)
1. Unconditional transmission mode
Suitable for peripherals that are always ready
Advantages: simple software and interface hardware
Disadvantages: only suitable for simple peripherals, narrow range of application
2. Query transmission
It is suitable for situations where peripherals are not always ready and do not require high transmission rate and transmission efficiency.
External equipment requirements: equipment status information should be provided
Interface requirements: a status port is required
Advantages: the software is relatively simple
Disadvantages: low efficiency of CPU, poor real-time data transmission, slow speed
3. Interruption of transmission
CPU has the advantages of high efficiency, good real-time performance and high speed, and the programming is complicated.
4. Direct memory access
Data transmission is controlled by DMA hardware, and data is directly exchanged between memory and peripherals, which can achieve a very high transmission rate (up to several MB/ seconds).
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