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PS2 mouse and key board
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The PS/2 controller can be used to communicate both with a PS/2 keyboard and a PS/2 mouse. It provides an interface to the PS/2 protocol, handling the data transmission, error detection and the timing control.
The PS/2 controller interface consists of the PS/2 clock and the PS/2 data inputs, and two 8-bit data ports. One of the 8-bit data ports is used for sending commands to the PS/2 device (mouse or keyboard), the other is for receiving data from the PS/2 device. There are also control signals provided to indicate the arrival of a new command from the PS/2 device and the status of the command transmission to the PS/2 device. The timing control necessary for the PS/2 communication is handled by the controller.
This document will describe the interface and operation of the PS/2 controller and give an overview of the PS/2 protocol
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