Circuit and method for multiplexing universal serial bus (USB) and PS/2 interfaces on computer

An interface multiplexing and computer technology, which is applied in the computer field, can solve the problems of increasing the number of host interfaces, increasing the volume of external interfaces, increasing design costs, etc., and achieves the effects of saving machine space, practical methods, and saving design costs

Inactive Publication Date: 2015-10-28
SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above method either increases the number of host interfaces or increases the volume of the external interface, which increases the design cost

Method used

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  • Circuit and method for multiplexing universal serial bus (USB) and PS/2 interfaces on computer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 Shown, a kind of circuit of USB, PS / 2 interface multiplexing on the computer, described circuit comprises CPLD control chip U2, two-way switch chip U1, dial switch K1, PS / 2 controller U3, USB controller U4, 4-pin aviation connector U5, where:

[0020] The PS / 2 controller U3 is connected to the input terminals 1B1 and 2B1 of the dual switch chip U1;

[0021] The USB controller U4 is connected to the input terminals 1B2 and 2B2 of the two-way switch chip U1;

[0022] After the dial switch K1 is connected in series with the resistor R1, it is connected to the input terminals S0 and S1 of the dual switch chip U1 through the CPLD control chip U2;

[0023] The output terminals 1A and 2A of the dual-way switch chip U1 are respectively connected in series with the inductors L1 and L2 to the 4-pin aviation plug interface U5;

[0024] The / 2OE and / 1OE of the two-way switch chip U1 are grounded;

[0025] The voltage P5V is connected to the 1B1 terminal of the...

Embodiment 2

[0031] On the basis of Embodiment 1, the model of the two-way switch chip U1 in this embodiment is SN74CBT3253.

Embodiment 3

[0033] On the basis of embodiment 1 or 2, present embodiment a kind of method for USB, PS / 2 interface multiplexing on the computer, described method implementation process is: when dial switch K1 is high level, CPLD controller U2 detects In this state, the control signal is output, so that the S0 and S1 ends of the switch chip U1 are both low level, and the PS / 2 data transmission channel is connected at this time; when the dial switch K1 is low level, the CPLD controller U2 outputs the control signal , so that the S0 terminal of the switch chip U1 is at a high level and the S1 terminal is at a low level, and at this time the USB data transmission channel is connected.

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Abstract

The invention discloses a circuit and a method for multiplexing universal serial bus (USB) and PS / 2 interfaces on a computer. The circuit comprises a complex programmable logic device (CPLD) control chip U2, a two-way switch chip U1, a dial switch K1, a PS / 2 controller U3, a USB controller U4 and a four-pin aviation plug interface U5, wherein the PS / 2 controller U3 and the USB controller U4 are connected with input ends S0 and S1 of the two-way switch chip U1; the dial switch K1 is connected into the input ends of the two-way switch chip U1 via the CPLD control chip U2; and an output end of the two-way switch chip U1 is connected with the four-pin aviation plug interface U5. When the dial switch is at one side, the aviation plug interface is connected with a USB signal line, and a USB device can be connected; and when the dial switch is at the other side, the aviation plug interface is connected with a PS / 2 signal line, and a PS / 2 device can be connected. Therefore, the four-pin aviation plug interface led to the outside is achieved, the function of time-shared connection of the USB or PS / 2 device is fulfilled, machine space is saved, design cost is saved, and the method is practical and effective.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a circuit and method for multiplexing USB and PS / 2 interfaces on a computer, and to a method of using a four-pin aviation plug interface to realize multiplexing of USB and PS / 2 interfaces. The 2-channel switching is realized by the dial switch, which is suitable for computer equipment such as ruggedized servers and all-in-one machines. Background technique [0002] The interface of the current mouse and keyboard is generally PS / 2 and USB. PS / 2 is a 6-pin circular interface, and USB is a rectangular interface. The advantage of PS / 2 is that it does not occupy system resources, but the disadvantage is that it cannot be plugged and played. (you need to restart the computer to use after plugging in); and the USB interface takes up a little system resources, but the advantage is that it can be plug-and-play. [0003] Generally, there are at least two PS / 2 on the back (or above) of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/38
CPCG06F13/385G06F2213/3806G06F2213/3812
Inventor 贾国强吴登勇陈乃阔
Owner SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD
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