The io interface is located between the bus and I/O devices. The host main memory must pass through the system bus. The host and I/O devices must pass through the system bus I/O interface before connecting to the I/O device. , rather than the I/O device being directly connected to the system bus.
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The io interface is located between the bus and the I/O device.
The host main memory must pass through the system bus. The host and I/O devices must pass through the system bus I/O interface and then connect to the I/O devices, rather than the I/O devices directly connecting to the system bus.
Related introduction:
l/O interface is the link between the host and the controlled object for information exchange. The host exchanges data with external devices through I/O interfaces. Most I/O interface circuits are programmable, that is, their working methods can be controlled by programs. Commonly used interfaces in industrial control machines are: 1. Parallel interface, such as 8155 and 8255; 2. Serial interface, such as 8251; 3. Direct data transmission interface, such as 8237; 4. Interrupt control interface, such as 8259; 5. Timer/counter interface, such as 8253, etc. In addition, since the computer can only receive digital quantities, and the measured parameters of the general continuous production process are mostly analog quantities, such as temperature, pressure, flow, liquid level, speed, voltage and current, etc., therefore, in order to realize computer control, It is also necessary to convert the analog quantity into a digital quantity, that is, perform A/D conversion.
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