JP2000099246A - Device detecting and switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the device detecting and switching device which accurately detects activator from a keyboard or mouse before a microcontroller operates normally. SOLUTION: A circuit module provided between the microcontroller 27 and connectors 21 and 26 monitors transmit signal codes of a PS/2 keyboard 20 and a mouse 25, and also automatically switches the transmission lines L1 and L2 of the PS/2 keyboard and mouse and then outputs accurate transmit signals to the microcontroller 28. In this case, a 1st decoder 30 and a 2nd decoder 31 outputs the received transmit signals to a monitor and control means 32 and then generate and output control signals to a switching device 34, which outputs the received 1st transmit signal S1 and 2nd transmit signal S2 as keyboard transmit signals KCLK and KDAT through the 1st signal transmission line L1 under the control of the control signals and also outputs them as mouse transmit signals MCLK and MDATA through the 2nd signal transmission line L2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device detection switching device, and more particularly, to monitoring a transmission signal code of a PS / 2 keyboard and a mouse by a discrimination circuit system.
The present invention relates to a device detection switching device that automatically switches an S / 2 keyboard and a mouse transmission line. It should be noted that P in this invention
S / 2 refers to the IBM Personal System / 2 personal computer series and compatible models.

[0002]

2. Description of the Related Art In the early days of computers, the mainstream was to operate the computer using a keyboard, but with the rapid development of computer technology, it was easy to use as a user interface (friend).
ly) A graphical user interface (GUI) has been fully adopted, and when operating a computer with the graphical user interface, a mouse serving as a pointer is
It is an essential component for personal computers.

[0003] Generally used personal computers include an RS-232 standard serial port (serial port).
port) is provided and the integrated circuit can be sufficiently operated by the driving current provided from the signal line of the RS-232 serial port, so that the mouse researched and developed thereafter uses the RS-232 serial interface. It only needed to be plugged into a computer and didn't need to supply a separate power supply. To date, with the development of the Internet, many users have connected to the Internet from home using a modem (MODEM), which also has to be connected to this serial port. It is. Of course, data transmission between different computers can be performed using an infrared transmission device for the serial port.
However, since a general personal computer usually has only two serial ports, the number of serial ports may be insufficient and the user may be in trouble. In addition, portable computers (portab
With the spread of le computers, this type of computer is required to be light and light and small, so the space for arranging various interface terminals is limited, so it is necessary to miniaturize various connection terminals as much as possible. . In view of the fact that such serial ports are insufficient and the connection terminals must be miniaturized, some mice now employ a PS / 2 interface. Since the connection terminal of the PS / 2 interface is small, many new personal computers are provided with a PS / 2 port so that a mouse and a keyboard can be connected.

With respect to the power control of a typical personal computer or workstation, initially, a purely mechanical open / close contact switch means is utilized to provide a 110 volt AC mains supply provided by a power supply circuit. (110 volts in the United States and Taiwan; 100 volts in Japan). When the power switch is open, no power is supplied to the power supply circuit of the system, so the system is in an off state.When the power switch is closed, AC power is supplied to the power supply circuit of the system. Therefore, various direct current power supplies (typically, for example, ± 5 V or ± 12 V) required for operating the computer system are generated by the power supply circuit, and the computer system can be started and operated. Such a mechanical power switch allows the computer system to be turned on or off for the first time by manual switching, and if no operation is performed or the user is not at the site of the computer system, the system is turned on. Could not be terminated.

[0005] Thereafter, Apple Computer Inc., C, of Cupertino, California, USA
Upertino, California) manufactured a Macintosh series personal computer that can be started or shut down by a designated key on a keyboard. When the power supply line of the computer system is connected to a power outlet, the system can monitor the system start key by using the keyboard circuit at all times. Upon detection, a soft power control was used to start the main power supply circuit of the system.

[0006] Also, Intel Corporation, Santa Clara, California, USA
ta Clara, California) also published ATX's main standard for personal computers, but its power supply circuit no longer uses a mechanical open / close switch as the main control switch of the computer system, but directly controls the system. Was to do. This ATX
According to the power supply standard, a circuit on a control chip inside the computer manages and controls the entire computer system power supply. This is also based on the concept of soft power control, in which the computer is turned on and off in various ways. It is no longer what you control.

[0007] Taking the ATX standard version 2.01 as an example, the backup power supply 5VSB is used as a DC 5V power supply,
A maximum output current of 0.7 A (amperes) is supplied to drive a basic power management circuit of a computer system in a stopped state. Such a power management circuit can set many convenient functions in operation and use.For example, if the system is set in advance, it is automatically activated at a scheduled time at night. Sending faxes overseas at the telephone company's discount time, or starting up at night or when no one is operating due to external modem calls and receiving external file transmissions Could be done.

[0008]

At present, in the use of a computer, the interfaces of the PS / 2 keyboard and the mouse belong to the same standard, but their transmission codes are different. So
PS / 2 keyboard and mouse connectors (connecto
When r) was connected to the PS / 2 interface, a connection error occurred. By the time the PS / 2 keyboard and mouse were started to be used, if such a situation occurred, neither the keyboard nor the mouse could be used normally. Later, a usage method of switching between the two using firmware was developed. However, the disadvantage of switching the transmission signal code of the PS / 2 keyboard and mouse by the firmware is that first, a subsystem microcontroller (also called a micro-controller microprocessor) or a keyboard controller (keyboard controller = KBC) is used. Only after starting up and operating normally, the function of switching between the PS / 2 keyboard and mouse that had a connection error can be completed. Therefore, a mechanism for accurately starting the entire system by a keyboard or a mouse cannot be provided from the beginning.

FIG. 1 shows a control interface structure between a main unit 18 and a PS / 2 keyboard 10 and a mouse 15 by a microcontroller 14 according to the prior art. The keyboard 10 is connected to a keyboard clock via a first PS / 2 connector 11. The signal KCLK and the keyboard data signal KDAT were output to the microcontroller 14 (for example, an Intel 8042 microcontroller used in an IBM personal computer). At the same time, the mouse 15 transmits the mouse clock signal MCLK and the mouse data signal MDAT to the microcontroller 14 via the second PS / 2 connector 16.
Was output to And the microcontroller 14
Is the received keyboard clock signal KCLK, keyboard data signal KDAT and mouse clock signal MC.
With respect to the LK and the mouse data signal MDAT, it is identified that the device connected to which connector 11, 16 is a PS / 2 mouse and the device connected to which connector 11, 16 is a PS / 2 keyboard. , An accurate signal was output to the main engine 18. However, in such a method, as described above, the device connected to the connectors 11 and 16 can be detected only after the microcontroller 14 is first activated, and the device can operate normally only after that. .

Therefore, a main object of the present invention is to provide a device detection switching device, which is disposed between a microcontroller and a connector, and whose circuit module is used for switching.
In addition to monitoring transmission signal codes of an S / 2 keyboard and a mouse, and automatically switching transmission lines of a PS / 2 keyboard and a mouse, a transmission signal is output to a microcontroller. Therefore, before the microcontroller operates normally, the activation mechanism by the keyboard or the mouse can function correctly.

[0011]

[Means for Solving the Problems]

In order to solve the above-mentioned problems and achieve a desired object, a device detection switching device according to the present invention provides a first transmission signal among a first transmission signal and a second transmission signal.
A signal output to the microcontroller as a PS / 2 keyboard transmission signal via a signal transmission line to the microcontroller and a second transmission signal output to the microcontroller as a PS / 2 mouse transmission signal via a second signal transmission line. A first decoder for receiving a first transmission signal and outputting a first data decryption signal to the supervisory control means, comprising a decoder, a second decoder, a supervisory control means, and an exchange. , The second decoder receives the second transmission signal and outputs the second data decryption signal to the supervisory control means. Then, the supervisory control means generates a control signal and outputs the control signal to the exchange. Outputs the first transmission signal and the second transmission signal received under control of the control signal as a keyboard transmission signal via the first signal transmission line, and transmits the mouse transmission via the second signal transmission line. It is obtained by the circuit configuration for outputting as No..

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below with reference to the drawings. 2A, the keyboard 20 outputs the first transmission signal S1 to the device detection switching device 23 via the first PS / 2 connector 21. The mouse 25 outputs the second transmission signal S2 to the device detection switching device 23 via the second PS / 2 connector 26. Then, the device detection switching device 23 converts the first PS / 2 connector 21 and the second PS / 2 for the first transmission signal S1 and the second transmission signal S2 input from the first PS / 2 connector 21 and the second PS / 2 connector 26, respectively. It is determined which of the devices connected to the connector 26 is a keyboard and which is a mouse. Next, the keyboard clock signal KCLK is transmitted through the first signal transmission line L1.
And the keyboard data signal KDAT to the microcontroller 27, and outputs the mouse clock signal MCLK and the mouse data signal MD via the second signal transmission line L2.
The AT (see FIG. 2B) is output to the microcontroller 27 so that an accurate signal can be transmitted between the microcontroller 27 and the main unit 28. At this time, the keyboard clock signal KCLK and the keyboard data signal KDAT indicate a keyboard transmission signal, and the mouse clock signal MCLK and the mouse data signal MDAT indicate a mouse transmission signal.

In FIG. 2B, a first transmission signal S1 is input to a first decoder 30, and a second transmission signal is input to a second decoder 31, and the first transmission signal S1 and the second transmission signal S2 are respectively input. , A first data decryption signal D1 and a second data decryption signal D2 each having 8 bits are generated and input to the monitoring control means 32. At this time, the first transmission signal S1 and the second transmission signal S
2 is also input to the exchanger 34 at the same time.

The codes of the transmission signals of the PS / 2 keyboard and the mouse 25 shown in FIG. 2A are different. For example, the initial code of the PS / 2 keyboard is AA.
And the initial code of the transmission signal of the PS / 2 mouse is A
Because of A00, the monitoring control unit 32 can monitor the first transmission signal S1 and the second transmission signal S2, and can monitor the first PS / 2 connector 21 and the second P signal.
If the device connected to the S / 2 connector 26 is a PS
A control signal Ctrl is output to the switch 34 by determining whether the keyboard is a / 2 keyboard or a PS / 2 mouse, and it is determined whether or not the first transmission signal S1 and the second transmission signal S2 are to be exchanged. For example, when the mouse 25 is connected to the second PS / 2 connector 26, after the first transmission signal S1 is input to the exchange 34, the keyboard clock signal KCLK and the keyboard data are transmitted via the first signal transmission line L1. The signal KDAT is output to the microcontroller 27, and the mouse clock signal MCLK and the mouse data signal MDAT are output to the microcontroller 27 via the second signal transmission line L2.

If the mouse 25 is connected to the first PS / 2 connector 21 and the keyboard 20 is connected to the second PS / 2 connector 26, after the first transmission signal S1 is input to the switch 34, The mouse clock signal MCLK and the mouse data signal MDAT are output to the microcontroller 27 via the two-signal transmission line L2, and the keyboard clock signal KCLK and the keyboard data signal KDAT are output to the microcontroller 27 via the first signal transmission line L1. I do.

Therefore, since it is not necessary to identify again that the transmission signal output from the exchange 34 is a PS / 2 keyboard transmission signal and a mouse transmission signal, the control unit that starts up the system uses the microcontroller 2.
It is not necessary to employ a mechanism that can confirm that the activation has been made by the keyboard or the mouse only after the normal operation of the N.7.

As described above, the present invention has been disclosed by the preferred embodiments. However, as will be easily understood by those skilled in the art, appropriate changes and modifications can be made within the technical idea of the present invention. Therefore, the scope of patent protection must be determined based on the claims and their equivalents.

[0018]

According to the configuration described above, the device detection switching device according to the present invention connects between the microcontroller and the connector, and monitors the transmission signal code transmitted from the connector to transmit the transmission signal. By outputting the signal to the keyboard or the mouse, the transmission signal of the keyboard or the mouse can be accurately generated before the microcontroller operates normally. Further, since the device detection switching device according to the present invention does not require control by a microcontroller due to its simple circuit configuration, it is possible to output a transmission signal of a PS / 2 keyboard and a mouse through an accurate transmission line. it can. Therefore, the PS / 2 keyboard and mouse enable quick and accurate activation, and are highly useful in industry.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a circuit configuration in which a microcontroller according to a conventional technique is used as a control interface between a main unit, a PS / 2 keyboard, and a mouse.

FIG. 2A is an explanatory diagram showing a circuit configuration of a control interface between a main unit and a PS / 2 keyboard and a mouse according to the present invention, and FIG. 2B is a device detection switching device according to the present invention; FIG. 3 is a block diagram showing a circuit configuration of FIG.

[Explanation of symbols]

 Reference Signs List 20 PS / 2 keyboard (keyboard) 21 1st PS / 2 connector 23 Device detection switching device 25 PS / 2 mouse (mouse) 26 2nd PS / 2 connector 27 Microcontroller 28 Main unit 30 First decoder 31 Second decoder 32 Monitoring control means 34 Exchanger KCLK Keyboard clock signal KDAT Keyboard data signal MCLK Mouse clock signal MDAT Mouse data signal S1 First transmission signal S2 Second transmission signal L1 First signal transmission line L2 Second signal transmission line D1 First data decoding signal D2 Second Data decoding signal

Claims (8)

[Claims] The first transmission signal and the second transmission signal are transmitted to a first transmission signal.
A first decoder for outputting to the microcontroller via a signal transmission line and a second signal transmission line, the first decoder receiving the first transmission signal and outputting a first data decoding signal; and the second transmission signal And a second decoder for receiving the first data decryption signal and receiving the first data decryption signal and the second data decryption signal, and outputting a control signal; and Receiving a transmission signal, a second transmission signal, and a control signal, outputting a PS / 2 keyboard transmission signal from the first signal transmission line to the microcontroller, and transmitting a PS / 2 mouse transmission signal to the second signal transmission line; And a switch for outputting to the microcontroller from the device detection switching device. 2. The first data decoding signal and the second data decoding signal
2. The device detection switching device according to claim 1, wherein the data decoding signal is an 8-bit data code. 3. The device detection switching device according to claim 1, wherein the PS / 2 keyboard transmission signal includes a keyboard clock signal and a keyboard data signal. 4. The device detection switching device according to claim 1, wherein the PS / 2 mouse transmission signal includes a mouse clock signal and a mouse data signal. 5. The device detection switching device according to claim 1, wherein the first transmission signal is output from a PS / 2 keyboard, and the second transmission signal is output from a PS / 2 mouse. 6. The method according to claim 1, wherein the PS / 2 keyboard is a first PS /
6. The device detection device according to claim 5, wherein the second transmission connector is connected to the second PS / 2 mouse to output the first transmission signal, and the PS / 2 mouse is connected to the second PS / 2 connector to output the second transmission signal. Switching device. 7. The device detection switching device according to claim 1, wherein the first transmission signal is output from a PS / 2 mouse, and the second transmission signal is output from a PS / 2 keyboard. 8. The PS / 2 mouse connected to a first PS / 2 connector for outputting the first transmission signal, and the PS / 2 keyboard connected to a second PS / 2 connector for outputting the second transmission signal. The device detection switching device according to claim 7, which outputs a transmission signal.