JPH11184581A - Connection controller for personal computer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection controller suited to a personal computer constituted so as to attach/detach electronic equipment provided with different functions to/from a housing part provided in a main body. SOLUTION: This connection controller is composed of switching elements 10, 11, 12, 13, 14 and 15 for controlling connection between shared signal terminals 1, 2 and 3 connected to electronic equipment and signal terminals 4, 5, 6, 7, 8 and 9 for the electronic equipment connected to a system control circuit, and of a switching control circuit 16 for controlling the operation of the switching elements 10-15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal computer, and more particularly to a connection control device for a personal computer in which an electronic device is configured to be detachable from a storage portion provided in a main body.

[0002]

2. Description of the Related Art Electronic devices called personal computers have become widespread, and such personal computers are configured to perform various arithmetic processing operations by a system control circuit incorporated in the devices. Such a personal computer is configured to perform a control operation of a hard disk device, a floppy disk device, a disk player, and the like, and to perform various arithmetic processing operations based on signals obtained from the device.

[0003]

Some personal computers include a hard disk device, a floppy disk device, a disk player, and the like, all incorporated in a main body of the personal computer. Since a personal computer is required to be miniaturized, it is impossible to incorporate all the above-described devices in the main body. In addition, since such a personal computer is used while being carried, a battery is used as a power source.
There is a problem that the life of the battery is short.

In order to solve such a problem, a notebook personal computer is provided with a storage section in which a floppy disk device or the like is attached and detached, and a battery pack is mounted in the storage section instead of the floppy disk device. Products that can extend the operation time have been developed.

Recently, floppy disk devices of different standards have been developed due to the increase in the capacity of floppy disks and the like, and it is required to incorporate such devices. Since the disk devices of such different standards have different numbers of connection terminals for performing signal input / output operations, it is necessary to provide many connection terminals in the storage section. However, a notebook personal computer has a problem that there is no space for providing many connection terminals.

An object of the present invention is to provide a connection control device that can solve such a problem.

[0007]

SUMMARY OF THE INVENTION According to the present invention, when a first electronic device is mounted in a storage portion provided in a main body of a personal computer, the first electronic device is connected to a signal input / output terminal provided in the first electronic device. And a shared signal terminal connected to a signal input / output terminal provided in the second electronic device when the second electronic device is mounted in the storage section, and a system control circuit for performing an arithmetic processing operation. The first electronic device signal terminal connected to the first electronic device signal input / output terminal is connected to the second electronic device signal input / output terminal provided in the system control circuit. (2) a signal terminal for electronic equipment, a first switching element connected between the dual-purpose signal terminal and the first electronic equipment signal terminal, and a first switching element connected between the dual-purpose signal terminal and the second electronic equipment signal terminal. Connected A second switching element, the first
It comprises a switching element and a switching control circuit for controlling the on / off operation of the second switching element.

[0008]

FIG. 1 is a circuit diagram showing an embodiment of a connection control device according to the present invention. In FIG. 1, reference numerals 1, 2 and 3 denote signal input / output provided in the first electronic device when the A electronic device is mounted in a housing provided in the main body of the personal computer. When a B electronic device, which is a second electronic device having a standard different from that of the A electronic device, is connected to the terminal and is attached to the housing portion, it is connected to a signal input / output terminal provided on the B electronic device. First,
The second and third shared signal terminals, 4, 5 and 6 are respectively connected to signal input / output terminals for A electronic equipment provided in a system control circuit (not shown) incorporated in the personal computer. First, second and third
A electronic device signal terminals 7, 8 and 9 are connected to signal input / output terminals for electronic device B provided in a system control circuit built in the personal computer, respectively. 2nd and 3rd B electronic equipment signal terminals.

Reference numeral 10 denotes a first field-effect transistor having a drain and a source connected between the first dual-purpose signal terminal 1 and the first-A electronic device signal terminal 4; The second field-effect transistor 12 having a drain and a source connected between the second signal terminal 5 for electronic device 5 and the third common signal terminal 3
A third field-effect transistor 13 having a drain and a source connected between the signal terminal 6 for an electronic device and a drain-source 13 between the first shared signal terminal 1 and the signal terminal 7 for a 1B electronic device. The fourth field effect transistor 14 is connected between the second signal terminal 2 and the second
A fifth field-effect transistor 15 having a drain and a source connected between the third signal terminal 3 and the third B signal terminal 9. A sixth field-effect transistor in which the sources are connected.

Reference numeral 16 denotes the first field-effect transistor 1
0, the second field-effect transistor 11, the third field-effect transistor 12, the fourth field-effect transistor 13,
This is a switching control circuit that controls a switching operation as an on / off operation of the fifth field-effect transistor 14 and the sixth field-effect transistor 15, and is configured as follows.

Reference numeral 17 denotes a selection terminal which is not grounded when the electronic device A is mounted and grounded when the electronic device B is mounted. The selection terminal 17 is connected to a power supply via the resistor 18. ing. Reference numeral 19 denotes a control signal input terminal to which a signal controlled by the system control circuit is applied. The control signal input terminal H is used when the electronic device A and the electronic device B are detached from the storage unit when the personal computer is in the operating state and when the personal computer is mounted. It is configured to apply a (high) level signal.

A first inverter circuit 20 has an input terminal connected to the selection terminal 17, a second inverter circuit 21 has an input terminal connected to the control signal input terminal 19, and 22 has one input terminal. A first AND circuit connected to the output terminal of the first inverter circuit 20 and having the other input terminal connected to the output terminal of the second inverter circuit 21 has an output terminal connected to the fourth electric field. The gate electrode is connected to the gate electrode of the effect transistor 13, the gate electrode of the fifth field effect transistor 14, and the gate electrode of the sixth field effect transistor 15. 2
3 has one input terminal connected to the selection terminal 17 and the other input terminal connected to the second inverter circuit 2.
A second AND circuit connected to the first output terminal;
Its output terminal is connected to the first field-effect transistor 10.
, The gate electrode of the second field-effect transistor 11 and the gate electrode of the third field-effect transistor 12.

Although the connection control device of the present invention is configured as described above, the operation of such a device will now be described. First, a case will be described in which the A electronic device is used by being mounted on a storage section provided in a main body of a personal computer. When the A electronic device is mounted in the storage section, predetermined terminals among a plurality of signal input / output terminals provided in the A electronic device are first and second signal terminals 1 and 2, respectively.
The selection terminal 17 is in a non-ground state while being connected to the dual-purpose signal terminal 2 and the third dual-purpose signal terminal 3.

In this state, when the power switch of the personal computer is operated to put the personal computer into an operating state, power is supplied to each circuit.
No control signal is applied to the control signal input terminal 19, and the signal level of the control signal input terminal 19 is at the L (low) level. Therefore, in such a state, the level of the output signal of the first inverter circuit 20 becomes L level, and the level of the output signal of the second inverter circuit 21 becomes H level.
Become a level.

In this state, the first AND circuit 2
2, the signal input to one input terminal of the second AND circuit 22 is at L level, so that an output terminal of the first AND circuit 22 outputs a signal of L level, and the signal input to the input terminal of the second AND circuit 23. Are both at the H level, the second
An H-level signal is output to the output terminal of the AND circuit 23. Accordingly, the fourth field effect transistor 13, the fifth field effect transistor 14, and the sixth field effect transistor 15, which are connected so that the operation is controlled by the output signal of the first AND circuit 22, become non-conductive, and A first field-effect transistor 10 and a second field-effect transistor 11 connected so that the operation is controlled by the output signal of the second AND circuit 23
And the third field effect transistor 12 is turned on.

When the first field effect transistor 10, the second field effect transistor 11, and the third field effect transistor 12 are turned on, the first shared signal terminal 1 and the second shared signal terminal 1 pass through the drain and source of the first field effect transistor 10. 1A electronic device signal terminal 4 is connected,
The second shared signal terminal 2 and the second A electronic device signal terminal 5 are connected through the drain and source of the second field effect transistor 11, and the third shared signal is passed through the drain and source of the third field effect transistor 12. The terminal 3 and the third-A electronic device signal terminal 6 are connected.

On the other hand, the fourth field-effect transistor 1
3. Since the fifth field-effect transistor 14 and the sixth field-effect transistor 15 are in a non-conducting state, the signal terminal 7 for the first B electronic device, the signal terminal 8 for the second B electronic device, and the signal terminal 9 for the third B electronic device are And the first and second shared signal terminals 1, 2 and 3 are disconnected from each other.

As described above, when the A electronic device is mounted in the storage section, the first electronic device connected to the signal input / output terminal of the A electronic device.
A first A signal terminal 4 and a second A electronic device signal terminal 4 in which the dual signal terminal 1, the second dual signal terminal 2 and the third dual signal terminal 3 are connected to a system control circuit incorporated in a personal computer. 5 is connected to the third A electronic device signal terminal 6, so that the A electronic device can perform the control operation of the A electronic device and the signal input / output operation by the system control circuit incorporated in the personal computer. Is performed as described above. Next, the operation when using the B electronic device will be described. When the B electronic device is mounted in a storage portion provided in the main body of the personal computer, predetermined terminals among a plurality of signal input / output terminals provided in the B electronic device are first and second signal terminals 1 and 2, respectively. 2
The selection terminal 17 is connected to the shared signal terminal 2 and the third shared signal terminal 3 and the selection terminal 17 is grounded by the B electronic device.

In this state, when the power switch of the personal computer is operated to put the personal computer into an operating state, power is supplied to each circuit.
No control signal is applied to the control signal input terminal 19, and the signal level of the control signal input terminal 19 is at the L level. Therefore, in such a state, the level of the output signal of the first inverter circuit 20 becomes H level,
The level of the output signal of the inverter circuit 21 becomes H level.

In this state, the first AND circuit 2
2 are both at the H level, an H level signal is output to the output terminal of the first AND circuit 22, and the signal is input to one input terminal of the second AND circuit 23. Signal is at L level, the second
An L-level signal is output to the output terminal of the AND circuit 23. Accordingly, the fourth field effect transistor 13, the fifth field effect transistor 14, and the sixth field effect transistor 15, which are connected so that the operation is controlled by the output signal of the first AND circuit 22, become conductive, and The first field-effect transistor 10, the second field-effect transistor 11, and the third field-effect transistor 12, which are connected so that the operation is controlled by the output signal of the 2-AND circuit 23, are turned off.

When the fourth field effect transistor 13, the fifth field effect transistor 14, and the sixth field effect transistor 15 are turned on, the first shared signal terminal 1 and the fourth shared signal terminal 1 pass through the drain and source of the fourth field effect transistor 13. 1B electronic device signal terminal 7 is connected,
The second shared signal terminal 2 and the second B electronic device signal terminal 8 are connected through the drain and source of the fifth field effect transistor 14, and the third shared signal is passed through the drain and source of the sixth field effect transistor 15. The terminal 3 and the 3B electronic device signal terminal 9 are connected.

On the other hand, the first field-effect transistor 1
0, the second field-effect transistor 11 and the third field-effect transistor 12 are in a non-conducting state, so that the first-A electronic device signal terminal 4, the second-A electronic device signal terminal 5, and the third-A electronic device signal terminal 6 And the first and second shared signal terminals 1, 2 and 3 are disconnected from each other.

When the B electronic device is mounted in the storage section as described above, the first electronic device connected to the signal input / output terminal of the B electronic device can be used.
A first B electronic device signal terminal 7 and a second B electronic device signal terminal in which the shared signal terminal 1, the second shared signal terminal 2 and the third shared signal terminal 3 are connected to a system control circuit incorporated in a personal computer. 8 and the signal terminal 9 for the third B electronic device, so that the control operation of the B electronic device and the input / output operation of the signal by the system control circuit incorporated in the personal computer can be performed. As described above, the operation in the case of using the A electronic device and the B electronic device is performed, but the case where the detachment operation of the A electronic device or the B electronic device is performed next when the power is supplied to the personal computer. explain.

When an operation for attaching and detaching an electronic device is performed, an H-level signal is applied to the control signal input terminal 19. When an H level signal is applied to the control signal input terminal 19, the level of the output signal of the second inverter circuit 21 becomes L level, so that the first AND circuit 22 and the second
The output signals of the AND circuit 23 are both at the L level. As a result, the first field-effect transistor 10, the second
The field-effect transistor 11, the third field-effect transistor 12, the fourth field-effect transistor 13, the fifth field-effect transistor 14, and the sixth field-effect transistor 15 are all turned off.

Accordingly, in such a state, the signal terminals 4 for the first A electronic device and the signal terminal 7 for the first B electronic device are not connected to the first shared signal terminal 1 and the second shared signal terminal. 2nd A electronic device signal terminal 5 with respect to terminal 2
And the second B electronic device signal terminal 8 is in a disconnected state,
Then, the third-A electronic device signal terminal 6 and the third-B electronic device signal terminal 9 are disconnected from the third shared signal terminal 3. As a result, the A electronic device and the B electronic device are disconnected from the system control circuit built in the personal computer, so that no problem occurs even if the electronic device is attached or detached during operation. I will not do it.

In this embodiment, a field effect transistor is used as a switching element, but it is of course possible to use another switching element. Further, in this embodiment, the case where three terminals are shared is described, but the number is not limited.

[0027]

According to the present invention, since the signal terminals connected to the electronic devices are also used as different electronic devices, the number of connectors can be reduced, and the number of terminals of the main unit can be reduced as in a notebook personal computer. This has a great effect when implemented in a device that cannot be made larger.

Further, according to the present invention, when the personal computer is in the operating state, the detaching operation of the electronic equipment can be performed without any trouble, so that the operability is excellent and the effect is very large.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a connection control device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 First shared signal terminal 2 Second shared signal terminal 3 Third shared signal terminal 4 1A electronic device signal terminal 5 2A electronic device signal terminal 6 3A electronic device signal terminal 7 1B electronic device signal terminal 8 Signal terminal for 2B electronic device 9 Signal terminal for 3B electronic device 16 Switching control circuit

Claims (5)

[Claims] 1. A personal computer in which first and second electronic devices having different functions are mounted in the same storage unit, and a system control circuit for controlling the mounted electronic devices is incorporated therein. The first electronic device is connected to a signal input / output terminal provided on the first electronic device when the first electronic device is mounted on the storage portion, and the second electronic device is connected on the second electronic device when the second electronic device is mounted on the storage portion. A dual-purpose signal terminal connected to a signal input / output terminal provided in an electronic device, and a first electronic device signal terminal connected to a signal input / output terminal for a first electronic device provided in a system control circuit And the second provided in the system control circuit.
A second electronic device signal terminal connected to the electronic device signal input / output terminal; a first switching element connected between the shared signal terminal and the first electronic device signal terminal; A first switching element connected between the signal terminal and the second electronic device signal terminal; and a switching control circuit for controlling on / off operations of the first switching element and the second switching element. When the device is mounted in the housing, the first switching element is turned on and the second switching element is turned off, and when the second electronic device is mounted in the housing, the first switching element is turned off. A connection control device for a personal computer, wherein the second switching element is turned on. 2. The connection control device according to claim 1, wherein an on / off control operation of the switching element by the switching control circuit is performed by an operation of mounting the electronic device in the storage unit. 3. The connection control device according to claim 1, wherein the switching element is constituted by a field effect transistor. 4. The connection control device according to claim 1, wherein when the personal computer is in an operation state, an attachment / detachment operation of an electronic device attached to the storage section is enabled. 5. The connection control device according to claim 4, wherein the first switching element and the second switching element are turned off when the electronic device is attached or detached.